expat before version 2.4.0 does not properly handle entities expansion unless an application developer uses the XML_SetEntityDeclHandler function, which allows remote attackers to cause a denial of service (resource consumption), send HTTP requests to intranet servers, or read arbitrary files via a crafted XML document, aka an XML External Entity (XXE) issue. NOTE: it could be argued that because expat already provides the ability to disable external entity expansion, the responsibility for resolving this issue lies with application developers; according to this argument, this entry should be REJECTed, and each affected application would need its own CVE.
CVE-2013-0340
“—” beside the score: it is equal to NVD's CVSS v2 base score.
This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 6.8 — NVD rates that MEDIUM (NVD's v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; no CRITICAL band). Vector AV:N/AC:M/Au:N/C:P/I:P/A:P. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 19% exploitation probability in the next 30 days; it does not lift the v2 base. EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated) sets EG Risk's exploitation input, not EPSS. Confidence: LOW.
Also known asEUVD-2013-0352 (ENISA EUVD) · GHSA-w3v2-46wf-pq33 (GitHub Security Advisories)Source: ENISA EUVD
- Lower severity and no public exploit yet
A fix is available — apply it.
- CVSS v2.0 (legacy)
- 6.8MEDIUMNVD never assigned a CVSS v3 rating to this CVE
- EG Score
- 6.8MEDIUMlow confidence
- EG Risk
- 62EG Risk 62/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity68% × 45%Impact severity (EG Severity): CVSS 6.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation40% × 40%EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.Automatability100% × 15%CISA's SSVC Automatable value: yes (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 19%
- EPSS %ILE
- 97th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (6.8): severity, escalated by confirmed exploitation. This CVE's 6.8 is its impact severity (EG Severity), not escalated.
- EG Severity
- 6.8 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v2.0 · CVSS v2.0AV:N/AC:M/Au:N/C:P/I:P/A:P
- EG Likelihood
- 19% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-25). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
January 21, 2014
Last Modified
October 14, 2026
References (26)
- secalert@redhat · CVE Programhttp://openwall.com/lists/oss-security/2013/02/22/3Exploit · Mailing List · Third Party Advisory
- secalert@redhat · CVE Programhttp://seclists.org/fulldisclosure/2021/Oct/61Mailing List · Third Party Advisory
- secalert@redhat · CVE Programhttp://seclists.org/fulldisclosure/2021/Oct/62Mailing List · Third Party Advisory
- secalert@redhat · CVE Programhttp://seclists.org/fulldisclosure/2021/Oct/63Mailing List · Third Party Advisory
- secalert@redhat · CVE Programhttp://seclists.org/fulldisclosure/2021/Sep/33Mailing List · Third Party Advisory
- secalert@redhat · CVE Programhttp://seclists.org/fulldisclosure/2021/Sep/34Mailing List · Third Party Advisory
- secalert@redhat · CVE Programhttp://seclists.org/fulldisclosure/2021/Sep/35Mailing List · Third Party Advisory
- secalert@redhat · CVE Programhttp://seclists.org/fulldisclosure/2021/Sep/38Mailing List · Third Party Advisory
- secalert@redhat · CVE Programhttp://seclists.org/fulldisclosure/2021/Sep/39Mailing List · Third Party Advisory
- secalert@redhat · CVE Programhttp://seclists.org/fulldisclosure/2021/Sep/40Mailing List · Third Party Advisory
- secalert@redhat · CVE Programhttp://securitytracker.com/id?1028213Third Party Advisory · VDB Entry
- secalert@redhat · CVE Programhttp://www.openwall.com/lists/oss-security/2013/04/12/6Mailing List · Third Party Advisory
- secalert@redhat · CVE Programhttp://www.openwall.com/lists/oss-security/2021/10/07/4Mailing List · Third Party Advisory
- secalert@redhat · CVE Programhttp://www.osvdb.org/90634 (archived copy: the site no longer serves it)Broken Link · VDB Entry
- secalert@redhat · CVE Programhttp://www.securityfocus.com/bid/58233 (archived copy: the site no longer serves it)Broken Link · Third Party Advisory · VDB Entry
15 of 26 shown · show the other 11
- secalert@redhathttps://github.com/libexpat/libexpat/blob/R_2_4_1/expat/Changes
- secalert@redhat · CVE Programhttps://lists.apache.org/thread.html/r41eca5f4f09e74436cbb05dec450fc2bef37b5d3e966aa7cc5fada6d%40%3Cannounce.apache.org%3EMailing List
- secalert@redhat · CVE Programhttps://lists.apache.org/thread.html/rfb2c193360436e230b85547e85a41bea0916916f96c501f5b6fc4702%40%3Cusers.openoffice.apache.org%3EMailing List
- secalert@redhat · CVE Programhttps://security.gentoo.org/glsa/201701-21Third Party Advisory · Vendor Advisory
- secalert@redhat · CVE Programhttps://support.apple.com/kb/HT212804Third Party Advisory
- secalert@redhat · CVE Programhttps://support.apple.com/kb/HT212805Third Party Advisory
- secalert@redhat · CVE Programhttps://support.apple.com/kb/HT212807Third Party Advisory
- secalert@redhat · CVE Programhttps://support.apple.com/kb/HT212814Third Party Advisory
- secalert@redhat · CVE Programhttps://support.apple.com/kb/HT212815Third Party Advisory
- secalert@redhat · CVE Programhttps://support.apple.com/kb/HT212819Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
Vendor Advisories for CVE-2013-0340(8)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2025:22871Red Hat Product SecurityHigh
Red Hat Security Advisory: expat security update
- RHSA-2025:22842Red Hat Product SecurityHigh
Red Hat Security Advisory: expat security update
- RHSA-2025:22785Red Hat Product SecurityHigh
Red Hat Security Advisory: expat security update
- RHSA-2025:22607Red Hat Product SecurityHigh
Red Hat Security Advisory: expat security update
- RHSA-2025:22035Red Hat Product SecurityHigh
Red Hat Security Advisory: expat security update
- RHSA-2025:21776Red Hat Product SecurityHigh
Red Hat Security Advisory: expat security update
- GHSA-w3v2-46wf-pq33GitHub Security AdvisoriesMedium
expat 2.1.0 and earlier does not properly handle entities expansion unless an application...
- CVE-2013-0340Microsoft Security Response Center (MSRC)Medium
expat 2.1.0 and earlier does not properly handle entities expansion unless an application developer uses the XML_SetEntityDeclHandler function which allows remote attackers to cause a denial of service (resource consumption) send HTTP requests to intranet servers or read arbitrary files via a crafted XML document aka an XML External Entity (XXE) issue. NOTE: it could be argued that because expat already provides the ability to disable external entity expansion the responsibility for resolving this issue lies with application developers; according to this argument this entry should be REJECTed and each affected application would need its own CVE.
Patch Availability(7)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| redhat | expat-0:2.2.10-1.el8_6 | 2025-12-09 | redhat |
| redhat | expat-0:2.2.10-1.el8_2 | 2025-12-09 | redhat |
| redhat | expat-0:2.2.10-1.el8_4 | 2025-12-04 | redhat |
| redhat | expat-0:2.2.10-1.el8_8 | 2025-12-02 | redhat |
| redhat | expat-0:2.2.10-12.el9_0.4 | 2025-11-25 | redhat |
| redhat | expat-0:2.5.0-1.el8_10 | 2025-11-19 | redhat |
| redhat | expat-0:2.4.9-1.el9_1 | 2022-11-15 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(6 across 4 ecosystems)
Debian:11(2)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| expat | 2.2.10-2 ... 2.8.2-1~deb13u1 (47 versions) |
| — |
| libxmltok | 1.2-4, 1.2-4.1, 1.2-4.1~exp1, 1.2-4.2 |
| — |
Debian:12(2)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| expat | — |
| — |
| libxmltok | 1.2-4, 1.2-4.1, 1.2-4.1~exp1, 1.2-4.2 |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| expat | — |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| expat | — |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Additional Vendor Advisories
(1)
Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.
Data Freshness Timeline
(refreshed 8× in last 7d / 46× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 97 of 180 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 3 repeat rows among the latest 100 are merged into the row they repeat. The 83 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-01 16:27 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-31 16:26 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-30 16:27 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-29 16:26 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-28 16:26 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-27 16:26 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-27 12:25 UTCOSV refresh
- 2026-10-26 16:25 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-25 20:10 UTCEG score recompute
- 2026-10-25 16:26 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-24 16:27 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-23 16:26 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-22 16:26 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-21 16:26 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-20 16:26 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-19 16:26 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-18 16:26 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-18 11:22 UTCEG score recompute
- 2026-10-17 16:26 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-16 16:26 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-15 16:26 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-14 16:26 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-14 07:27 UTCVendor advisory
- 2026-10-14 07:26 UTCGHSA enrichmentGHSA-w3v2-46wf-pq33
- 2026-10-14 07:25 UTCNVD update
Show 72 moreShow fewer
- 2026-10-14 06:37 UTCVendor advisory
- 2026-10-14 06:37 UTCGHSA enrichmentGHSA-w3v2-46wf-pq33
- 2026-10-14 06:34 UTCMITRE cvelistV5
- 2026-10-13 16:26 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-12 21:27 UTCEG score recompute
- 2026-10-12 16:27 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-12 01:34 UTCEG score recompute
- 2026-10-11 13:39 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-10 19:54 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-09 20:34 UTCVendor advisory
- 2026-10-09 20:34 UTCGHSA enrichmentGHSA-w3v2-46wf-pq33
- 2026-10-09 20:33 UTCNVD update
- 2026-10-09 20:00 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-09 19:19 UTCEG score recompute
- 2026-10-09 19:19 UTCVendor advisory
- 2026-10-09 19:19 UTCGHSA enrichmentGHSA-w3v2-46wf-pq33
- 2026-10-09 19:18 UTCMITRE cvelistV5
- 2026-10-07 23:39 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-06 15:10 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-05 17:38 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-10-04 23:16 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-09-30 14:58 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-09-29 23:41 UTCOSV refresh
- 2026-09-29 08:34 UTCEG score recompute
- 2026-09-27 13:39 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-09-26 15:52 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-09-24 13:57 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-09-18 19:21 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-09-15 03:04 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-09-12 14:55 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-09-11 09:30 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-09-10 21:53 UTCOSV refresh
- 2026-09-06 13:42 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-09-05 15:22 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-09-04 13:55 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-09-02 14:06 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-09-01 13:47 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-08-27 14:20 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-08-26 14:40 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-08-25 13:43 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-08-24 07:23 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-08-23 13:52 UTCOSV refresh
- 2026-08-21 23:44 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-08-20 22:50 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-08-19 16:59 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-08-18 13:42 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-08-16 02:09 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-08-15 01:25 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-08-12 13:45 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-08-08 16:31 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-08-07 16:21 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-08-07 15:27 UTCOSV refresh
- 2026-08-06 13:42 UTCEPSS rescoreEPSS 19% · 97th percentile
- 2026-08-05 19:12 UTCEPSS rescoreEPSS 20% · 97th percentile
- 2026-08-04 15:04 UTCEPSS rescoreEPSS 20% · 97th percentile
- 2026-08-02 02:22 UTCEPSS rescoreEPSS 20% · 97th percentile
- 2026-07-30 01:26 UTCEPSS rescoreEPSS 20% · 97th percentile
- 2026-07-28 15:31 UTCEPSS rescoreEPSS 20% · 97th percentile
- 2026-07-26 13:47 UTCEG score recomputeFirst assessed: 6.8 MEDIUM
- 2026-07-25 14:12 UTCEPSS rescoreEPSS 20% · 97th percentile
- 2026-07-23 14:14 UTCEPSS rescoreEPSS 20% · 97th percentile
- 2026-07-23 01:09 UTCEG score recompute
- 2026-07-23 00:12 UTCEG score recompute
- 2026-07-22 21:51 UTCEG score recompute
- 2026-07-22 14:04 UTCEPSS rescoreEPSS 20% · 97th percentile
- 2026-07-22 08:07 UTCOSV refresh
- 2026-07-21 15:21 UTCEPSS rescoreEPSS 20% · 97th percentile
- 2026-07-20 17:03 UTCEPSS rescoreEPSS 20% · 97th percentile
- 2026-07-19 02:25 UTCEPSS rescoreEPSS 20% · 97th percentile
- 2026-07-18 10:00 UTCEPSS rescoreEPSS 20% · 97th percentile
- 2026-07-16 16:58 UTCEPSS rescoreEPSS 20% · 97th percentile
- 2026-07-15 16:54 UTCEPSS rescoreEPSS 20% · 97th percentile
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownDebian:11:libxmltok
- CVE-2024-45490EG 9.8CRITICAL
- CVE-2022-40674NVD 8.1EG 9.8CRITICAL
- CVE-2022-25315EG 9.8EPSS p92CRITICAL
- CVE-2022-25236EG 9.8EPSS p98CRITICAL
- CVE-2022-25235EG 9.8EPSS p92CRITICAL
- CVE-2022-23990NVD 7.5EG 9.8EPSS p92CRITICAL
- CVE-2022-23852EG 9.8EPSS p92CRITICAL
- CVE-2022-22824EG 9.8EPSS p90CRITICAL
- CVE-2022-22823EG 9.8EPSS p90CRITICAL
- CVE-2022-22822EG 9.8EPSS p93CRITICAL
Same vendor
10 shownredhat:RHSA-2025:21776 · redhat:RHSA-2025:22035 · redhat:RHSA-2025:22785
Same CWE
10 shownCWE-611
Frequently asked(4)
What is CVE-2013-0340?
When was CVE-2013-0340 made public?
Is CVE-2013-0340 actively exploited?
How do I remediate CVE-2013-0340?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2013-0340
Is Your Infrastructure Affected by CVE-2013-0340?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.