Public proof of conceptFix available

CVE-2006-5051

Q: Is CVE-2006-5051 actively exploited?

Active exploitation of CVE-2006-5051 has not been confirmed. Its EPSS score was 45.0% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2006-5051?

CVE-2006-5051 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

A public proof of concept exists; no exploitation attested.

Published2006-09-27
Fixed in10.3.9
WeaknessCWE-415

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Signal handler race condition in OpenSSH before 4.4 allows remote attackers to cause a denial of service (crash), and possibly execute arbitrary code if GSSAPI authentication is enabled, via unspecified vectors that lead to a double-free.

Timeline

dates in UTC

2006-09-2723:07CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2006-5051?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2006-5051?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Apple mac os x

Branch	Affected	Fixed in	Source
10.3	< 10.3.9	10.3.9	NVD
10.4	≥ 10.4, ≤ 10.4.8	no fix published	NVD

Apple mac os x server

Branch	Affected	Fixed in	Source
10.3	< 10.3.9	10.3.9	NVD
10.4	≥ 10.4, ≤ 10.4.8	no fix published	NVD

Debian debian linux

Branch	Affected	Fixed in	Source
3.1	= 3.1	no fix published	NVD

1 more product in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Apple mac os x to 10.3.9

Advisories and patches

openssh.orgRelease Notes
secunia.comVendor Advisory
secunia.comVendor Advisory
secunia.comVendor Advisory
secunia.comVendor Advisory
secunia.comVendor Advisory

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 3 repositories, unverifiedbigb0x/CVE-2024-6387sardine-web/CVE-2024-6387_Checkanhvutuan/CVE-2024-6387-poc-1

Sources

NVDCVSS 3.18.1read 2026-10-23
NVDCVSS 2.09.3read 2026-10-23
NVDweakness (CWE)CWE-415read 2026-10-23
FIRST EPSSEPSS score45.0 %read 2026-10-23
PoC-in-GitHubproof of concept3read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2006-09-27
Last Modified: 2026-06-16
NVD status: Modified

Frequently asked questions

What is CVE-2006-5051?

Is CVE-2006-5051 actively exploited?

Active exploitation of CVE-2006-5051 has not been confirmed. Its EPSS score was 45.0% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2006-5051?

CVE-2006-5051 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

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