Skip to content
Fencer Vulns
medium 5.0

CVE-2009-0845 json

The spnego_gss_accept_sec_context function in lib/gssapi/spnego/spnego_mech.c in MIT Kerberos 5 (aka krb5) 1.5 through 1.6.3, when SPNEGO i…

published 2009-03-27 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-0842

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.6%
EPSS 5.6% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

The spnego_gss_accept_sec_context function in lib/gssapi/spnego/spnego_mech.c in MIT Kerberos 5 (aka krb5) 1.5 through 1.6.3, when SPNEGO is used, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via invalid ContextFlags data in the reqFlags field in a negTokenInit token.

Patch / fix

  • mit kerberos_5 1.6.4
  • mit krb5 1.6.4
  • krb5 Debian 14, Debian 13, Debian 12 1.6.dfsg.4~beta1-13

debian advisories DEBIAN-CVE-2009-0845

  • krb5 RHEL 5 1.6.1-31.el5_3.3
  • krb5-libs RHEL 5 1.6.1-31.el5_3.3
  • krb5-server RHEL 5 1.6.1-31.el5_3.3
  • krb5-workstation RHEL 5 1.6.1-31.el5_3.3

red hat advisories RHSA-2009:0408

  • krb5 openSUSE Tumbleweed 1.15-1.1

opensuse advisories openSUSE-SU-2024:10004-1

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-2009-0845 updated cvss 4.3

krb5: NULL pointer dereference in GSSAPI SPNEGO (MITKRB5-SA-2009-001)

  • Red Hat Enterprise Linux (v. 5 server) krb5 1.6.1-31.el5_3.3, krb5-libs 1.6.1-31.el5_3.3, krb5-server 1.6.1-31.el5_3.3, krb5-workstation 1.6.1-31.el5_3.3 Red Hat Enterprise Linux Desktop (v. 5 client) krb5 1.6.1-31.el5_3.3, krb5-libs 1.6.1-31.el5_3.3, krb5-server 1.6.1-31.el5_3.3, krb5-workstation 1.6.1-31.el5_3.3 Red Hat Enterprise Linux Desktop Workstation (v. 5 client) krb5 1.6.1-31.el5_3.3, krb5-libs 1.6.1-31.el5_3.3, krb5-server 1.6.1-31.el5_3.3, krb5-workstation 1.6.1-31.el5_3.3
    fixed: vendor fix RHSA-2009:0408

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

5.63% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • src.mit.edu http://src.mit.edu/fisheye/browse/krb5/trunk/src/lib/gssapi/spnego/spnego_mech.c?r1=21875&r2=22084 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-20 Improper Input Validation

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Improve kerberos 5 affected range consistency.