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Fencer Vulns
high 8.1

CVE-2006-5051 in the critical feed json

Signal handler race condition in OpenSSH before 4.4 allows remote attackers to cause a denial of service (crash), and possibly execute arbi…

published 2006-09-27 20 y ago modified 2026-06-16 4 mo ago also EUVD-2006-5036

cvss
8.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
45.6%
EPSS 45.6% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known

Summary

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.

Patch / fix

  • apple mac_os_x 10.3.9
  • apple mac_os_x_server 10.3.9
  • openssh Debian 14, Debian 13, Debian 12 1:4.6p1-1

debian advisories DEBIAN-CVE-2006-5051

  • openssh RHEL 2.1 3.1p1-21
  • openssh-server RHEL 2.1 3.1p1-21
  • openssh-askpass RHEL 2.1 3.1p1-21
  • openssh-clients RHEL 2.1 3.1p1-21
  • openssh-askpass-gnome RHEL 2.1 3.1p1-21
  • openssh RHEL 3 3.6.1p2-33.30.12
  • openssh RHEL 4 3.9p1-8.RHEL4.17
  • openssh-server RHEL 3 3.6.1p2-33.30.12

red hat advisories RHSA-2006:0698RHSA-2006:0697

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2006-5051 updated

unsafe GSSAPI signal handler

  • Red Hat Desktop version 3 openssh 3.6.1p2-33.30.12, openssh-server 3.6.1p2-33.30.12, openssh-askpass 3.6.1p2-33.30.12, openssh-clients 3.6.1p2-33.30.12, openssh-askpass-gnome 3.6.1p2-33.30.12
    fixed: vendor fix RHSA-2006:0697
  • Red Hat Enterprise Linux AS (Advanced Server) version 2.1 openssh 3.1p1-21, openssh-server 3.1p1-21, openssh-askpass 3.1p1-21, openssh-clients 3.1p1-21, openssh-askpass-gnome 3.1p1-21
    fixed: vendor fix RHSA-2006:0698
  • Red Hat Enterprise Linux AS version 3 openssh 3.6.1p2-33.30.12, openssh-server 3.6.1p2-33.30.12, openssh-askpass 3.6.1p2-33.30.12, openssh-clients 3.6.1p2-33.30.12, openssh-askpass-gnome 3.6.1p2-33.30.12 Red Hat Enterprise Linux AS version 4 openssh 3.9p1-8.RHEL4.17, openssh-server 3.9p1-8.RHEL4.17, openssh-askpass 3.9p1-8.RHEL4.17, openssh-clients 3.9p1-8.RHEL4.17, openssh-askpass-gnome 3.9p1-8.RHEL4.17 Red Hat Enterprise Linux Desktop version 4 openssh 3.9p1-8.RHEL4.17, openssh-server 3.9p1-8.RHEL4.17, openssh-askpass 3.9p1-8.RHEL4.17, openssh-clients 3.9p1-8.RHEL4.17, openssh-askpass-gnome 3.9p1-8.RHEL4.17
    fixed: vendor fix RHSA-2006:0697
  • Red Hat Enterprise Linux ES version 2.1 openssh 3.1p1-21, openssh-server 3.1p1-21, openssh-askpass 3.1p1-21, openssh-clients 3.1p1-21, openssh-askpass-gnome 3.1p1-21
    fixed: vendor fix RHSA-2006:0698
  • Red Hat Enterprise Linux ES version 3 openssh 3.6.1p2-33.30.12, openssh-server 3.6.1p2-33.30.12, openssh-askpass 3.6.1p2-33.30.12, openssh-clients 3.6.1p2-33.30.12, openssh-askpass-gnome 3.6.1p2-33.30.12 Red Hat Enterprise Linux ES version 4 openssh 3.9p1-8.RHEL4.17, openssh-server 3.9p1-8.RHEL4.17, openssh-askpass 3.9p1-8.RHEL4.17, openssh-clients 3.9p1-8.RHEL4.17, openssh-askpass-gnome 3.9p1-8.RHEL4.17
    fixed: vendor fix RHSA-2006:0697
  • Red Hat Enterprise Linux WS version 2.1 openssh 3.1p1-21, openssh-server 3.1p1-21, openssh-askpass 3.1p1-21, openssh-clients 3.1p1-21, openssh-askpass-gnome 3.1p1-21
    fixed: vendor fix RHSA-2006:0698
  • Red Hat Enterprise Linux WS version 3 openssh 3.6.1p2-33.30.12, openssh-server 3.6.1p2-33.30.12, openssh-askpass 3.6.1p2-33.30.12, openssh-clients 3.6.1p2-33.30.12, openssh-askpass-gnome 3.6.1p2-33.30.12 Red Hat Enterprise Linux WS version 4 openssh 3.9p1-8.RHEL4.17, openssh-server 3.9p1-8.RHEL4.17, openssh-askpass 3.9p1-8.RHEL4.17, openssh-clients 3.9p1-8.RHEL4.17, openssh-askpass-gnome 3.9p1-8.RHEL4.17
    fixed: vendor fix RHSA-2006:0697
  • Red Hat Linux Advanced Workstation 2.1 openssh 3.1p1-21, openssh-server 3.1p1-21, openssh-askpass 3.1p1-21, openssh-clients 3.1p1-21, openssh-askpass-gnome 3.1p1-21
    fixed: vendor fix RHSA-2006:0698

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

45.59% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.