Security readout for executives and security teams
Plain-English summary
This is a legacy local privilege escalation issue in Kerberos 4 authentication code on old NetBSD and FreeBSD systems. A local user could trigger a buffer overflow through Kerberised applications such as telnetd or login and gain root privileges. It matters mainly where obsolete BSD systems or Kerberos 4 services still exist.
Executive priority
Prioritize if any legacy BSD systems remain in production or sensitive networks. The business risk is root compromise by an existing local user. If no such systems or Kerberos 4 services exist, urgency is low but inventory confirmation is still prudent.
Technical view
CVE-2001-0094 is a buffer overflow in kdc_reply_cipher in libkrb, the Kerberos 4 authentication library. Reported affected platforms are NetBSD 1.5 and FreeBSD 4.2 and earlier. The CVE states local users may gain root privileges through Kerberised applications including telnetd and login.
Likely exposure
Exposure is likely limited to legacy environments running NetBSD 1.5, FreeBSD 4.2, or earlier with Kerberos 4 components and Kerberised services enabled. Modern systems are unlikely to be affected unless they retain old compatibility libraries or services.
Exploitation context
The provided sources describe local privilege escalation, not remote unauthenticated compromise. There is no KEV listing and no cited source in the bundle indicating active exploitation. Exploitation requires local user access on an affected system.
Researcher notes
Evidence is sparse and old. The source bundle names affected OS versions and vulnerable function but does not provide CVSS, CWE, patch identifiers, or detailed vendor remediation. Avoid assuming impact beyond NetBSD 1.5, FreeBSD 4.2 and earlier, and Kerberos 4/libkrb usage.
Mitigation direction
- Inventory legacy NetBSD and FreeBSD systems matching the affected versions.
- Check vendor guidance or historical advisories for corrected Kerberos 4/libkrb packages.
- Disable Kerberos 4 and Kerberised telnetd/login where not required.
- Retire or isolate unsupported affected systems.
Validation and detection
- Confirm OS version is NetBSD 1.5, FreeBSD 4.2, or earlier.
- Check whether libkrb or Kerberos 4 packages are installed.
- Identify enabled Kerberised applications such as telnetd or login.
- Review local user access on any confirmed affected host.
Public sources used
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
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2001-0094 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
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
- kerberos4-auth-packet-overflow(5734)CVE reference · vdb-entry, x_refsource_XF
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.