CVE-2009-0846: Apple Mac OS X

High severity, CVSS 10.0. EPSS: 8.9% chance of exploitation in the next 30 days.

The asn1_decode_generaltime function in lib/krb5/asn.1/asn1_decode.c in the ASN.1 GeneralizedTime decoder in MIT Kerberos 5 (aka krb5) before 1.6.4 allows remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code via vectors involving an invalid DER encoding that triggers a free of an uninitialized pointer.

Affected products

• Apple Mac OS X: before 10.5.7 (fixed in 10.5.7)
• Canonical Ubuntu Linux: version 6.06 only; version 7.10 only; version 8.04 only; version 8.10 only
• Fedoraproject Fedora: version 9 only; version 10 only
• Mit Kerberos 5: before 1.6.4 (fixed in 1.6.4)
• Red Hat Enterprise Linux: version 4.0 only
• Red Hat Enterprise Linux Desktop: version 3.0 only; version 4.0 only
• Red Hat Enterprise Linux Eus: version 4.7 only
• Red Hat Enterprise Linux Server: version 2.0 only; version 3.0 only; version 4.0 only
• Red Hat Enterprise Linux Workstation: version 2.0 only; version 3.0 only; version 4.0 only

Published 2009-04-09. Last modified 2026-06-16.