A certain Debian patch for OpenSSH before 4.3p2-9etch3 on etch; before 4.6p1-1 on sid and lenny; and on other distributions such as SUSE uses functions that are not async-signal-safe in the signal handler for login timeouts, which allows remote attackers to cause a denial of service (connection slot exhaustion) via multiple login attempts. NOTE: this issue exists because of an incorrect fix for CVE-2006-5051.
CVE-2008-4109
“—” 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 5.0 — 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:L/Au:N/C:N/I:N/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 29% 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-2008-4092 (ENISA EUVD) · GHSA-6wrv-35h9-3pj7 (GitHub Security Advisories)Source: ENISA EUVD
- Lower severity and no public exploit yet
A fix is available — apply it.
- CVSS v2.0 (legacy)
- 5.0MEDIUMNVD never assigned a CVSS v3 rating to this CVE
- EG Score
- 5.0MEDIUMlow 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)Severity50% × 45%Impact severity (EG Severity): CVSS 5.0 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.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.Exploitation none (CISA Vulnrichment) · Automatable no (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. - EPSS PROB
- 29%
- EPSS %ILE
- 98th
- 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 (5.0): severity, escalated by confirmed exploitation. This CVE's 5.0 is its impact severity (EG Severity), not escalated.
- EG Severity
- 5.0 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v2.0 · CVSS v2.0AV:N/AC:L/Au:N/C:N/I:N/A:P
- EG Likelihood
- 29% within 30 daysSource: FIRST EPSS. 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 every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade 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 every mission impact level.
A fix is available. Apply it within your standard update timelines.
Exploitation none (CISA Vulnrichment) · Automatable no (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (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
September 18, 2008
Last Modified
April 23, 2026
References (10)
- MITRE · CVE Programhttp://bugs.debian.org/cgi-bin/bugreport.cgi?bug=498678
- MITRE · CVE Programhttp://lists.opensuse.org/opensuse-security-announce/2008-10/msg00004.html
- MITRE · CVE Programhttp://secunia.com/advisories/31885 (archived copy: the site no longer serves it)
- MITRE · CVE Programhttp://secunia.com/advisories/32080 (archived copy: the site no longer serves it)
- MITRE · CVE Programhttp://secunia.com/advisories/32181 (archived copy: the site no longer serves it)
- MITRE · CVE Programhttp://www.debian.org/security/2008/dsa-1638Patch
- MITRE · CVE Programhttp://www.openwall.com/lists/oss-security/2024/07/01/3
- MITRE · CVE Programhttp://www.securitytracker.com/id?1020891
- MITRE · CVE Programhttp://www.ubuntu.com/usn/usn-649-1
- MITRE · CVE Programhttps://exchange.xforce.ibmcloud.com/vulnerabilities/45202
Patch Availability(1)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| ubuntu | openssh-server (1:4.6p1-5ubuntu0.6) @ gutsy | 2026-10-25 | ubuntu |
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
(5 across 5 ecosystems)
Debian:11(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| openssh | — |
| — |
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| openssh | — |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| openssh | — |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| openssh | — |
| — |
Debian:4.0(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| openssh | 1:4.3p2-9, 1:4.3p2-9etch1, 1:4.3p2-9etch2, 1:4.3p2-9etch2+m68k1 |
| — |
All Vendor Advisories
(1)
Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.
Data Freshness Timeline
(refreshed 6× in last 7d / 33× 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 91 of 148 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. 9 repeat rows among the latest 100 are merged into the row they repeat. The 57 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-01 16:25 UTCEPSS rescoreEPSS 29% · 98th percentile
- 2026-10-31 16:25 UTCEPSS rescoreEPSS 29% · 98th percentile
- 2026-10-30 16:26 UTCEPSS rescoreEPSS 29% · 98th percentile
- 2026-10-29 16:26 UTCEPSS rescoreEPSS 29% · 98th percentile
- 2026-10-28 16:25 UTCEPSS rescoreEPSS 29% · 98th percentile
- 2026-10-27 16:25 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-10-25 20:24 UTCEG score recompute
- 2026-10-25 20:24 UTCVendor advisory
- 2026-10-25 20:24 UTCGHSA enrichmentGHSA-6wrv-35h9-3pj7
- 2026-10-25 16:25 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-10-24 16:25 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-10-23 16:25 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-10-22 16:25 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-10-21 16:25 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-10-20 16:25 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-10-19 16:25 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-10-18 16:25 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-10-18 11:49 UTCEG score recompute
- 2026-10-17 16:25 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-10-16 16:25 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-10-15 16:25 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-10-14 16:26 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-10-13 16:26 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-10-12 21:51 UTCEG score recompute
- 2026-10-12 16:26 UTCEPSS rescoreEPSS 28% · 98th percentile
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- 2026-10-12 01:58 UTCEG score recompute
- 2026-10-11 13:38 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-10-10 19:53 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-10-09 20:00 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-10-08 16:33 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-10-07 23:37 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-10-06 15:09 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-10-04 23:15 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-10-04 00:54 UTCOSV refresh
- 2026-10-03 14:20 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-10-01 19:42 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-09-30 14:57 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-09-29 07:52 UTCEG score recompute
- 2026-09-26 15:52 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-09-18 19:20 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-09-17 19:20 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-09-15 03:04 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-09-14 15:14 UTCOSV refresh
- 2026-09-12 14:54 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-09-10 09:24 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-09-06 13:41 UTCEPSS rescoreEPSS 28% · 97th percentile
- 2026-09-05 15:22 UTCEPSS rescoreEPSS 28% · 98th percentile
- 2026-09-04 13:55 UTCEPSS rescoreEPSS 28% · 97th percentile
- 2026-09-04 04:59 UTCEPSS rescoreEPSS 28% · 97th percentile
- 2026-08-30 01:14 UTCEPSS rescoreEPSS 29% · 98th percentile
- 2026-08-28 21:34 UTCEPSS rescoreEPSS 29% · 98th percentile
- 2026-08-26 15:38 UTCOSV refresh
- 2026-08-15 01:24 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-08-10 05:09 UTCOSV refresh
- 2026-08-08 16:31 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-08-07 16:21 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-08-06 13:41 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-08-05 19:11 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-07-30 01:25 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-07-26 13:36 UTCEG score recomputeFirst assessed: 5.0 MEDIUM
- 2026-07-25 14:12 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-07-25 05:11 UTCOSV refresh
- 2026-07-24 14:12 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-07-23 00:56 UTCEG score recompute
- 2026-07-23 00:35 UTCEG score recompute
- 2026-07-23 00:01 UTCEG score recompute
- 2026-07-22 21:40 UTCEG score recompute
- 2026-07-20 17:03 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-07-18 09:59 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-07-16 16:58 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-07-15 16:54 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-07-13 22:25 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-07-13 06:07 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-07-11 08:22 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-07-09 19:04 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-07-08 15:09 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-07-08 00:12 UTCOSV refresh
- 2026-07-06 16:23 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-07-04 06:27 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-07-02 14:00 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-07-01 15:02 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-06-30 23:19 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-06-29 14:02 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-06-28 14:03 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-06-28 04:52 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-06-27 03:04 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-06-25 13:46 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-06-24 14:02 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-06-23 21:29 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-06-22 14:22 UTCEPSS rescoreEPSS 29% · 97th percentile
- 2026-06-21 14:53 UTCEPSS rescoreEPSS 29% · 97th percentile
Public detection checks
(1 reference)A public detection check is referenced for this CVE (1 GitHub checker repository). A GitHub repository named or described as a checker or scanner checks whether a system is affected; it is not necessarily exploit code.
- GitHub checkerbigb0x/CVE-2024-6387Published Jul 1, 2024
Bulk Scanning Tool for OpenSSH CVE-2024-6387, CVE-2006-5051 , CVE-2008-4109 and others.
Open source ↗
Related CVEs(same product + same vendor)
Same product
10 shownDebian:4.0:openssh · Debian:11:openssh
- CVE-2008-0166NVD 7.5EG 8.6EPSS p99HIGH
- CVE-2006-5051NVD 8.1EG 8.4EPSS p99HIGH
- CVE-2007-4752EG 7.5HIGH
- CVE-2008-1483EG 6.9MEDIUM
- CVE-2008-2285EG 5.0MEDIUM
- CVE-2003-0786EG 10.0HIGH
- CVE-2003-0693EG 10.0EPSS p96HIGH
- CVE-2002-0640EG 10.0EPSS p98HIGH
- CVE-2023-51385NVD 6.5EG 9.8EPSS p97CRITICAL
- CVE-2023-38408EG 9.8EPSS p100CRITICAL
Frequently asked(4)
What is CVE-2008-4109?
When was CVE-2008-4109 made public?
Is CVE-2008-4109 actively exploited?
How do I remediate CVE-2008-4109?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2008-4109
Is Your Infrastructure Affected by CVE-2008-4109?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.