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.
Conclusion & alert: CVE-2009-0846 is rated High Risk (69.2/100): CVSS Critical severity, with high exploitation likelihood (EPSS 50.01%, 98th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. Mandatory action: High exploitation likelihood—assess exposure and prioritize remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-04-09 | 56.35% | 50.01% | -6.35% |
| 2 | 2026-02-05 | 58.07% | 56.35% | -1.72% |
| 3 | 2026-01-23 | — | 58.07% | — |
Full EPSS history (26 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 10.0 | 2.0 | HIGH |
|
10.0 | 10.0 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2009-0846 not yet assigned priority: Debian including 1 source packages (krb5), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2009-0846 |
gentoo
|
high | CVE-2009-0846: 1 GLSA(s) (200904-09), 1 atom(s) (app-crypt/mit-krb5); latest impact high. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2009-0846 |
redhat
|
critical | — | https://access.redhat.com/security/cve/CVE-2009-0846 |
suse
|
critical | CVE-2009-0846 severity critical: SUSE including 115 source package names (krb5-1.12.1-19.1, krb5-1.12.1-6.3, …), 170 product×package rows across 34 product lines (SUSE Linux Enterprise Desktop 12, SUSE Linux Enterprise Desktop 12 SP1, … (34 product lines)): Fixed 170. | https://www.suse.com/security/cve/CVE-2009-0846/ |
ubuntu
|
medium | CVE-2009-0846 medium priority: Ubuntu including 1 source packages (krb5), 5 status rows across 5 suites (dapper, gutsy, hardy, intrepid, upstream): released 5. | https://ubuntu.com/security/CVE-2009-0846 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| mit | kerberos_5 | < 1.6.4 | cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:* |
| fedoraproject | fedora | 9 | cpe:2.3:o:fedoraproject:fedora:9:*:*:*:*:*:*:* |
| fedoraproject | fedora | 10 | cpe:2.3:o:fedoraproject:fedora:10:*:*:*:*:*:*:* |
| canonical | ubuntu_linux | 6.06 | cpe:2.3:o:canonical:ubuntu_linux:6.06:*:*:*:*:*:*:* |
| canonical | ubuntu_linux | 7.10 | cpe:2.3:o:canonical:ubuntu_linux:7.10:*:*:*:*:*:*:* |
| canonical | ubuntu_linux | 8.04 | cpe:2.3:o:canonical:ubuntu_linux:8.04:*:*:*:*:*:*:* |
| canonical | ubuntu_linux | 8.10 | cpe:2.3:o:canonical:ubuntu_linux:8.10:*:*:*:*:*:*:* |
| apple | mac_os_x | < 10.5.7 | cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:* |
| redhat | enterprise_linux | 4.0 | cpe:2.3:o:redhat:enterprise_linux:4.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux_desktop | 3.0 | cpe:2.3:o:redhat:enterprise_linux_desktop:3.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux_desktop | 4.0 | cpe:2.3:o:redhat:enterprise_linux_desktop:4.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux_eus | 4.7 | cpe:2.3:o:redhat:enterprise_linux_eus:4.7:*:*:*:*:*:*:* |
| redhat | enterprise_linux_server | 2.0 | cpe:2.3:o:redhat:enterprise_linux_server:2.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux_server | 3.0 | cpe:2.3:o:redhat:enterprise_linux_server:3.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux_server | 4.0 | cpe:2.3:o:redhat:enterprise_linux_server:4.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux_workstation | 2.0 | cpe:2.3:o:redhat:enterprise_linux_workstation:2.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux_workstation | 3.0 | cpe:2.3:o:redhat:enterprise_linux_workstation:3.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux_workstation | 4.0 | cpe:2.3:o:redhat:enterprise_linux_workstation:4.0:*:*:*:*:*:*:* |