What is CVE-2011-5000?

CVE-2011-5000 is a vulnerability in OpenBSD OpenSSH, classified under CWE-189. Published 2012-04-05.

Is CVE-2011-5000 known to be exploited?

28 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in OpenBSD OpenSSH

CVE-2011-5000

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.

Published 2012-04-05 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 3.5 (Low). Vector: AV:N/AC:M/Au:S/C:N/I:N/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.026 (84.5th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 84.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.026 · newest: 0.026 · change: 0.000

Affected products

OpenBSD OpenSSH — versions 1.2, 1.2.1, 1.2.2

Weakness classification (CWE)

CWE-189

Public proof-of-concept exploits

References

seclists.org/fulldisclosure/2011/Aug/2 (mailing-list, Exploit)
rhn.redhat.com/errata/RHSA-2012-0884.html (vendor-advisory)
site.pi3.com.pl/adv/ssh_1.txt (Exploit)

Frequently asked questions

What is CVE-2011-5000?: CVE-2011-5000 is a vulnerability in OpenBSD OpenSSH, classified under CWE-189. Published 2012-04-05.
Is CVE-2011-5000 known to be exploited?: 28 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.