Kerberos 4 KDC program does not properly check for null termination of…
Priority LOW 27Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Partial
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA.
Summary
Kerberos 4 KDC program does not properly check for null termination of AUTH_MSG_KDC_REQUEST requests, which allows remote attackers to cause a denial of service via a malformed request.
Why it matters now
EPSS 0.02284 83rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:cygnus:cygnus_network_security:4.0:*:*:*:*:*:*:* | 4.0 | Vulnerable | Cygnus |
| cpe:2.3:a:cygnus:kerbnet:5.0:*:*:*:*:*:*:* | 5.0 | Vulnerable | Cygnus |
| cpe:2.3:a:mit:kerberos:4.0:*:*:*:*:*:*:* | 4.0 | Vulnerable | moos-ivp |
| cpe:2.3:a:mit:kerberos_5:1.0:*:*:*:*:*:*:* | 1.0 | Vulnerable | moos-ivp |
| cpe:2.3:a:mit:kerberos_5:1.1:*:*:*:*:*:*:* | 1.1 | Vulnerable | moos-ivp |
| cpe:2.3:a:mit:kerberos_5:1.1.1:*:*:*:*:*:*:* | 1.1.1 | Vulnerable | moos-ivp |
- cpe:2.3:a:cygnus:cygnus_network_security:4.0:*:*:*:*:*:*:* Versions 4.0 Vulnerable ·Cygnus
- cpe:2.3:a:cygnus:kerbnet:5.0:*:*:*:*:*:*:* Versions 5.0 Vulnerable ·Cygnus
- cpe:2.3:a:mit:kerberos:4.0:*:*:*:*:*:*:* Versions 4.0 Vulnerable ·moos-ivp
- cpe:2.3:a:mit:kerberos_5:1.0:*:*:*:*:*:*:* Versions 1.0 Vulnerable ·moos-ivp
- cpe:2.3:a:mit:kerberos_5:1.1:*:*:*:*:*:*:* Versions 1.1 Vulnerable ·moos-ivp
- cpe:2.3:a:mit:kerberos_5:1.1.1:*:*:*:*:*:*:* Versions 1.1.1 Vulnerable ·moos-ivp
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2000-0549
- 2026-10-03 Alias added: GHSA-5pwv-v67v-mf36
References
Sources
- CVE-2000-0549 · CVE Program
- CVE-2000-0549 · NVD
- FIRST EPSS
- GHSA-5pwv-v67v-mf36 · GitHub Advisory Database · CC BY 4.0
- CVE-2000-0549 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences