NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very large RRsets can cause Unbound to spend a considerable time applying name compression to downstream replies. This can lead to degraded performance and eventually denial of service in well orchestrated attacks. The vulnerability can be exploited by a malicious actor querying Unbound for the specially crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will try to apply name compression which was an unbounded operation that could lock the CPU until the whole packet was complete. Unbound version 1.21.1 introduces a hard limit on the number of name compression calculations it is willing to do per packet. Packets that need more compression will result in semi-compressed packets or truncated packets, even on TCP for huge messages, to avoid locking the CPU for long. This change should not affect normal DNS traffic.
CVE-2024-8508
“—” beside the score: it is equal to NVD's CVSS score.
Score 5.3 from GitHub Security Advisory published 2024-10-03. NVD baseline CVSS 5.3; sources differ by 0.0.
Also known asEUVD-2024-49228 (ENISA EUVD) · GHSA-g7cv-x9wx-38gx (GitHub Security Advisories)Source: ENISA EUVD
- Lower severity and no public exploit yet
A fix is available — apply it.
Fixed versions, as the CVE record's CNA (NLnet Labs) states them: "This issue is fixed in 1.21.1 and all later versions."
- CVSS v3
- 5.3
- EG Score
- 5.3MEDIUMmedium confidence
- EG Risk
- 39EG Risk 39/100
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)Severity53% × 45%Impact severity (EG Severity): CVSS 5.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.8% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.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
- 0.8%
- EPSS %ILE
- 56th
- 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 (5.3): severity, escalated by confirmed exploitation. This CVE's 5.3 is its impact severity (EG Severity), not escalated.
- EG Severity
- 5.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 0.8% 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
October 3, 2024
Last Modified
December 17, 2024
References (3)
- sep@nlnetlabshttps://www.nlnetlabs.nl/downloads/unbound/CVE-2024-8508.txtVendor Advisory
- CVE Programhttp://www.openwall.com/lists/oss-security/2024/10/04/5Mailing List · Third Party Advisory
- CVE Programhttps://lists.debian.org/debian-lts-announce/2024/11/msg00009.htmlMailing List · Third Party Advisory
Vendor Advisories for CVE-2024-8508(8)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2025:8197Red Hat Product SecurityMedium
Red Hat Security Advisory: unbound security update
- RHSA-2025:8047Red Hat Product SecurityMedium
Red Hat Security Advisory: unbound security update
- RHSA-2025:1120Red Hat Product SecurityHigh
Red Hat Security Advisory: OpenShift Container Platform 4.17.16 bug fix and security update
- RHSA-2025:0837Red Hat Product SecurityHigh
Red Hat Security Advisory: unbound security update
- RHSA-2025:0140Red Hat Product SecurityHigh
Red Hat Security Advisory: OpenShift Container Platform 4.16.30 bug fix and security update
- RHSA-2024:11232Red Hat Product SecurityMedium
Red Hat Security Advisory: unbound:1.16.2 security update
- RHSA-2024:11170Red Hat Product SecurityMedium
Red Hat Security Advisory: unbound security update
- CVE-2024-8508Microsoft Security Response Center (MSRC)
CVE-2024-8508
Patch Availability(8)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| ubuntu | unbound-host (1.13.1-1ubuntu5.8) @ jammy | 2026-10-24 | ubuntu |
| redhat | unbound-0:1.16.2-18.el9_6 | 2025-05-27 | redhat |
| redhat | unbound-0:1.20.0-10.el10_0 | 2025-05-20 | redhat |
| redhat | openshift/ose-rhel-coreos-9:417.94.202502051822-0 | 2025-02-11 | redhat |
| redhat | unbound-0:1.16.2-5.8.el8_10 | 2025-01-30 | redhat |
| redhat | openshift/ose-rhel-coreos-9:416.94.202501030250-0 | 2025-01-15 | redhat |
| redhat | unbound-0:1.16.2-8.el9_4.1 | 2024-12-17 | redhat |
| redhat | unbound-0:1.16.2-8.el9_5.1 | 2024-12-17 | 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
(12 across 12 ecosystems)
Alpine:v3.17(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| unbound | — |
| — |
Alpine:v3.18(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| unbound | — |
| — |
Alpine:v3.19(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| unbound | — |
| — |
Alpine:v3.20(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| unbound | — |
| — |
Alpine:v3.21(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| unbound | — |
| — |
Alpine:v3.22(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| unbound | — |
| — |
Alpine:v3.23(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| unbound | — |
| — |
Alpine:v3.24(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| unbound | — |
| — |
Debian:11(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| unbound | 1.13.1-1, 1.13.1-1+deb11u1, 1.13.1-1+deb11u2, 1.13.1-1+deb11u3 |
| — |
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| unbound | 1.17.1-2, 1.17.1-2+deb12u1, 1.17.1-2+deb12u2 |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| unbound | — |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| unbound | — |
| — |
Weakness Classification(2)
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 7× in last 7d / 40× 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 95 of 215 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. 5 repeat rows among the latest 100 are merged into the row they repeat. The 120 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-02 16:41 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-11-01 16:32 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-31 16:30 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-30 16:32 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-29 16:31 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-28 16:30 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-27 16:30 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-26 16:29 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-25 16:51 UTCEG score recompute
- 2026-10-25 16:30 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-24 16:30 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-24 02:25 UTCEG score recompute
- 2026-10-24 02:25 UTCVendor advisory
- 2026-10-24 02:25 UTCGHSA enrichmentGHSA-g7cv-x9wx-38gx · GitHub CVSS 5.3
- 2026-10-23 16:30 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-22 16:32 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-21 16:30 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-10-19 16:30 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-10-18 16:30 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-10-18 05:55 UTCEG score recompute
- 2026-10-17 16:32 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-10-16 16:37 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-10-15 16:30 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-10-14 16:30 UTCEPSS rescoreEPSS 0.8% · 55th percentile
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- 2026-10-13 16:31 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-10-12 17:31 UTCEG score recompute
- 2026-10-12 16:32 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-10-11 20:59 UTCEG score recompute
- 2026-10-11 19:10 UTCEG score recompute
- 2026-10-11 15:51 UTCEG score recompute
- 2026-10-11 13:46 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-10-10 19:58 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-10-10 12:25 UTCOSV refresh
- 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-10-08 17:08 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-10-07 23:46 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-10-06 15:16 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-10-05 17:41 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-10-03 14:24 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-10-02 17:57 UTCEG score recompute
- 2026-10-01 19:48 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-29 15:18 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-27 13:44 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-26 15:57 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-24 14:02 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-23 13:46 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-09-22 14:47 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-09-20 22:23 UTCOSV refresh
- 2026-09-20 20:14 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-09-19 15:41 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-09-18 19:26 UTCEPSS rescoreEPSS 0.8% · 55th percentile
- 2026-09-16 14:06 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-16 05:13 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-15 03:08 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-13 16:45 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-12 14:59 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-11 14:51 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-11 09:35 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-10 09:33 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-07 16:00 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-06 13:46 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-04 13:59 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-04 05:05 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-02 14:10 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-01 21:27 UTCOSV refresh
- 2026-09-01 13:52 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-08-30 19:16 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-08-30 01:21 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-28 21:39 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-27 14:24 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-26 14:44 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-25 13:47 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-24 14:15 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-23 00:18 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-21 23:47 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-20 22:54 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-19 17:02 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-18 13:47 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-17 13:46 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-16 14:55 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-16 02:13 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-15 23:37 UTCOSV refresh
- 2026-08-15 01:29 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-13 21:59 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-12 13:49 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-10 23:58 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-09 13:45 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-08 16:35 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-07 16:26 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-06 13:45 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-05 19:16 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownAlpine:v3.17:unbound
Same vendor
5 shownredhat:RHSA-2025:0140 · redhat:RHSA-2025:0837 · redhat:RHSA-2025:1120
Frequently asked(5)
What is CVE-2024-8508?
When was CVE-2024-8508 made public?
Is CVE-2024-8508 actively exploited?
What is the CVSS score of CVE-2024-8508?
How do I remediate CVE-2024-8508?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2024-8508
Is Your Infrastructure Affected by CVE-2024-8508?
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