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.
Conclusion & alert: CVE-2009-0845 is rated High Exploit Risk (62.2/100): CVSS Medium severity, with high exploitation likelihood (EPSS 5.63%, 92th percentile). Core evidence: 1 public exploit reference(s) are indexed (Exploit-DB). Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
| EDB-ID | Source | Kind | Published | Link |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
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 | 19.31% | 5.63% | -13.68% |
| 2 | 2026-01-18 | 23.24% | 19.31% | -3.93% |
| 3 | 2025-12-10 | — | 23.24% | — |
Full EPSS history (14 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2009-0845 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-2009-0845 |
gentoo
|
high | CVE-2009-0845: 1 GLSA(s) (200904-09), 1 atom(s) (app-crypt/mit-krb5); latest impact high. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2009-0845 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2009-0845 |
suse
|
medium | CVE-2009-0845 severity moderate: 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-2009-0845/ |
ubuntu
|
medium | CVE-2009-0845 medium priority: Ubuntu including 1 source packages (krb5), 5 status rows across 5 suites (dapper, gutsy, hardy, intrepid, upstream): released 3, needs-triage 1, not-affected 1. | https://ubuntu.com/security/CVE-2009-0845 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| mit | kerberos | 5-1.6.3 | cpe:2.3:a:mit:kerberos:5-1.6.3:*:*:*:*:*:*:* |
| mit | kerberos_5 | 1.5 | cpe:2.3:a:mit:kerberos_5:1.5:*:*:*:*:*:*:* |
| mit | kerberos_5 | 1.5.1 | cpe:2.3:a:mit:kerberos_5:1.5.1:*:*:*:*:*:*:* |
| mit | kerberos_5 | 1.5.2 | cpe:2.3:a:mit:kerberos_5:1.5.2:*:*:*:*:*:*:* |
| mit | kerberos_5 | 1.5.3 | cpe:2.3:a:mit:kerberos_5:1.5.3:*:*:*:*:*:*:* |
| mit | kerberos_5 | 1.6 | cpe:2.3:a:mit:kerberos_5:1.6:*:*:*:*:*:*:* |
| mit | kerberos_5 | 1.6.1 | cpe:2.3:a:mit:kerberos_5:1.6.1:*:*:*:*:*:*:* |
| mit | kerberos_5 | 1.6.2 | cpe:2.3:a:mit:kerberos_5:1.6.2:*:*:*:*:*:*:* |