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Vulnerability record · CVE-2009-0845 · published 27 March 2009

CVE-2009-0845: Mit kerberos improper input validation vulnerability

Mit · Kerberos

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.

5.0 CVSS 2.0 Medium EPSS 5.6% · top 7.3% CWE-20 · Improper input validation
5.0CVSS 2.0 base score
5.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
88References, 2 tagged exploit
16 Jun 2026Last modified by NVD

Description

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.

AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://krbdev.mit.edu/rt/Ticket/Display.html?user=guest&pass=guest&id=6402
http://lists.apple.com/archives/security-announce/2009/May/msg00002.html
http://secunia.com/advisories/34347 Vendor Advisory
http://secunia.com/advisories/34594
http://secunia.com/advisories/34617
http://secunia.com/advisories/34622
http://secunia.com/advisories/34628
http://secunia.com/advisories/34630
http://secunia.com/advisories/34637
http://secunia.com/advisories/34640
http://secunia.com/advisories/34734
http://secunia.com/advisories/35074 Vendor Advisory
http://security.gentoo.org/glsa/glsa-200904-09.xml
http://src.mit.edu/fisheye/browse/krb5/trunk/src/lib/gssapi/spnego/spnego_mech.c?r1=21875&r2=22084 Exploit
http://src.mit.edu/fisheye/changelog/krb5/?cs=22084 Vendor Advisory
http://sunsolve.sun.com/search/document.do?assetkey=1-26-256728-1
http://support.apple.com/kb/HT3549
http://support.avaya.com/elmodocs2/security/ASA-2009-142.htm
http://support.novell.com/docs/Readmes/InfoDocument/patchbuilder/readme_5047180.html
http://support.novell.com/docs/Readmes/InfoDocument/patchbuilder/readme_5047181.html
http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-001.txt
http://wiki.rpath.com/Advisories:rPSA-2009-0058
http://wiki.rpath.com/wiki/Advisories:rPSA-2009-0058
http://www-01.ibm.com/support/docview.wss?uid=swg21396120
http://www.kb.cert.org/vuls/id/662091 US Government Resource
http://www.mandriva.com/security/advisories?name=MDVSA-2009:082
http://www.redhat.com/support/errata/RHSA-2009-0408.html
http://www.securityfocus.com/archive/1/502526/100/0/threaded
http://www.securityfocus.com/archive/1/502546/100/0/threaded
http://www.securityfocus.com/bid/34257
http://www.securitytracker.com/id?1021867
http://www.ubuntu.com/usn/usn-755-1
http://www.us-cert.gov/cas/techalerts/TA09-133A.html US Government Resource
http://www.vupen.com/english/advisories/2009/0847 Vendor Advisory
http://www.vupen.com/english/advisories/2009/0976
http://www.vupen.com/english/advisories/2009/1057
http://www.vupen.com/english/advisories/2009/1106
http://www.vupen.com/english/advisories/2009/1297
http://www.vupen.com/english/advisories/2009/2248 Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/49448

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2009-0845), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.