Security readout for executives and security teams
This is an old remote code execution weakness in MIT Kerberos 5. A malformed or error-triggering authentication path could cause a double free in krb5_recvauth. The main business risk is legacy Kerberos infrastructure or old OS packages that were never patched. Exposure is most likely on legacy systems running MIT Kerberos 5 1.4.1 or earlier, or OS packages from that era. Systems using Kerberos-aware network services linked to vulnerable krb5 libraries deserve review. Prioritize remediation if Kerberos is present on legacy Unix, Linux, or macOS systems. This is not a current KEV-listed emergency, but remote code execution in authentication infrastructure is high-impact if old packages remain. Mitigation focus: Identify any MIT Kerberos 5 1.4.1 or earlier deployments.; Apply MIT Kerberos or OS vendor updates from the listed advisories.; Replace unsupported legacy Kerberos packages with vendor-supported versions..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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Execution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2005-1689 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- kerberos-kdc-krb5recvauth-execute-code(21055)CVE reference · vdb-entry, x_refsource_XF
- USN-224-1CVE reference · vendor-advisory, x_refsource_UBUNTU
- oval:org.mitre.oval:def:9819CVE reference · vdb-entry, signature
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.