CVE-2008-4109

mediumpriority · track · 40EPSS 0.284 · 98 %ileexploit · PoCEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

28.4% (98th) EPSS

CVSS 5 · medium

Is it mine?

69 products

Check your exposure

Who says so?

2 sources

enisa_euvd · nvd

EPSS · scored 2026-10-23

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.

cvss

Technical severity, 0–10. One row per scoring source.

5.0

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v2.04.5mediumAV:N/AC:L/Au:N/C:N/I:N/A:P/E:POCsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-264USprimary

exploits (1)

Public proof-of-concept and weaponised exploit code.

bigb0x/CVE-2024-6387Bulk Scanning Tool for OpenSSH CVE-2024-6387, CVE-2006-5051 , CVE-2008-4109 and others.PoC · poc_in_github

affected products (69)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
openbsd openssh≤ 4.3p2nvdUScpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
openbsd openssh≤ 4.6nvdUScpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
openbsd openssh= 1.2nvdUScpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
openbsd openssh= 1.2.1nvdUScpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
openbsd openssh= 1.2.2nvdUScpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
openbsd openssh= 1.2.27nvdUScpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
openbsd openssh= 1.2.3nvdUScpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
openbsd openssh= 1.3nvdUScpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
openbsd openssh= 1.5nvdUScpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
openbsd openssh= 1.5.7nvdUScpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
openbsd openssh= 1.5.8nvdUScpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
openbsd openssh= 2nvdUScpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
openbsd openssh= 2.1nvdUScpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
openbsd openssh= 2.1.1nvdUScpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
openbsd openssh= 2.2nvdUScpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
openbsd openssh= 2.3nvdUScpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
openbsd openssh= 2.3.1nvdUScpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
openbsd openssh= 2.5nvdUScpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
openbsd openssh= 2.5.1nvdUScpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*

showing 20 of 69

also known as (2)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

enisa_euvd nvd NVD CVE.org MITRE

published 2008-09-18modified 2026-06-16

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+8949 more

references (20)

External citations — patches, advisories, analysis.

scry

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