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Fencer Intel
low 3.5

CVE-2011-5000 json

The ssh_gssapi_parse_ename function in gss-serv.c in OpenSSH 5.8 and earlier, when gssapi-with-mic authentication is enabled, allows remote…

published 2012-04-04 14 y ago modified 2026-06-16 4 mo ago also EUVD-2011-4905

cvss
3.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.6%
EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

The ssh_gssapi_parse_ename function in gss-serv.c in OpenSSH 5.8 and earlier, when gssapi-with-mic authentication is enabled, allows remote authenticated users to cause a denial of service (memory consumption) via a large value in a certain length field. NOTE: there may be limited scenarios in which this issue is relevant.

Patch / fix

  • openssh Debian 14, Debian 13, Debian 12 1:5.9p1-1

debian advisories DEBIAN-CVE-2011-5000

  • openssh RHEL 6 5.3p1-81.el6
  • openssh-ldap RHEL 6 5.3p1-81.el6
  • openssh-server RHEL 6 5.3p1-81.el6
  • openssh-askpass RHEL 6 5.3p1-81.el6
  • openssh-clients RHEL 6 5.3p1-81.el6
  • pam_ssh_agent_auth RHEL 6 0.9-81.el6

red hat advisories RHSA-2012:0884

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-2011-5000 updated cvss 3.5

openssh: post-authentication resource exhaustion bug via GSSAPI

  • Red Hat Enterprise Linux 4 openssh Red Hat Enterprise Linux 5 openssh
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Desktop (v. 6) openssh 5.3p1-81.el6, openssh-server 5.3p1-81.el6, openssh-askpass 5.3p1-81.el6, openssh-clients 5.3p1-81.el6 Red Hat Enterprise Linux Desktop Optional (v. 6) openssh 5.3p1-81.el6, openssh-ldap 5.3p1-81.el6, pam_ssh_agent_auth 0.9-81.el6 Red Hat Enterprise Linux HPC Node (v. 6) openssh 5.3p1-81.el6, openssh-server 5.3p1-81.el6, openssh-clients 5.3p1-81.el6 Red Hat Enterprise Linux HPC Node Optional (v. 6) openssh 5.3p1-81.el6, openssh-ldap 5.3p1-81.el6, openssh-askpass 5.3p1-81.el6, pam_ssh_agent_auth 0.9-81.el6 Red Hat Enterprise Linux Server (v. 6) openssh 5.3p1-81.el6, openssh-server 5.3p1-81.el6, openssh-askpass 5.3p1-81.el6, openssh-clients 5.3p1-81.el6 Red Hat Enterprise Linux Server Optional (v. 6) openssh 5.3p1-81.el6, openssh-ldap 5.3p1-81.el6, pam_ssh_agent_auth 0.9-81.el6
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 6) openssh 5.3p1-81.el6, openssh-server 5.3p1-81.el6, openssh-askpass 5.3p1-81.el6, openssh-clients 5.3p1-81.el6 Red Hat Enterprise Linux Workstation Optional (v. 6) openssh 5.3p1-81.el6, openssh-ldap 5.3p1-81.el6, pam_ssh_agent_auth 0.9-81.el6
    fixed: vendor fix RHSA-2012:0884

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

2.56% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • seclists.org http://seclists.org/fulldisclosure/2011/Aug/2 referenced PoC, tagged "exploit" by a source, unverified
  • site.pi3.com.pl http://site.pi3.com.pl/adv/ssh_1.txt referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 3.5 AV:N/AC:M/Au:S/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Intel 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.