The asn1buf_imbed function in the ASN.1 decoder in MIT Kerberos 5 (aka krb5) 1.6.3, when PK-INIT is used, allows remote attackers to cause a denial of service (application crash) via a crafted length value that triggers an erroneous malloc call, related to incorrect calculations with pointer arithmetic.
Conclusion & alert: CVE-2009-0847 is rated Moderate Risk (41.7/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.77%). Mandatory action: Review affected assets and schedule 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 | 2026-06-15 | 20.29% | 2.77% | -17.51% |
| 2 | 2025-12-23 | 12.83% | 20.29% | +7.46% |
| 3 | 2025-12-01 | — | 12.83% | — |
Full EPSS history (12 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 4.3 | 2.0 | MEDIUM |
|
8.6 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2009-0847 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-2009-0847 |
gentoo
|
high | CVE-2009-0847: 1 GLSA(s) (200904-09), 1 atom(s) (app-crypt/mit-krb5); latest impact high. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2009-0847 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2009-0847 |
suse
|
high | CVE-2009-0847 severity important: 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-2009-0847/ |
ubuntu
|
medium | CVE-2009-0847 medium priority: Ubuntu including 1 source packages (krb5), 5 status rows across 5 suites (dapper, gutsy, hardy, intrepid, upstream): released 4, not-affected 1. | https://ubuntu.com/security/CVE-2009-0847 |
Not vulnerable. This issue did not affect the versions of krb5 as shipped with Red Hat Enterprise Linux 2.1, 3, 4, or 5.