Heimdal before 7.7.1 allows attackers to cause a NULL pointer dereference in a SPNEGO…
Priority MEDIUM 42CWE-476Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-476.
Summary
Heimdal before 7.7.1 allows attackers to cause a NULL pointer dereference in a SPNEGO acceptor via a preferred_mech_type of GSS_C_NO_OID and a nonzero initial_response value to send_accept.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01328 71st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
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 · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:heimdal_project:heimdal:*:*:*:*:*:*:*:* | before 7.7.1 | Vulnerable | Heimdal Project |
- cpe:2.3:a:heimdal_project:heimdal:*:*:*:*:*:*:*:* Versions before 7.7.1 Vulnerable ·Heimdal Project
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-44758
References
More Heimdal Project Heimdal vulnerabilities
- TI-2011-04182 Buffer overflow in libtelnet/encrypt.c in telnetd in FreeBSD 7.3 through 9.0, MIT… CVSS 2.0HIGH 10.0
- TI-2022-21958 Heimdal before 7.7.1 allows remote attackers to execute arbitrary code because of an… CVSS 3.1CRITICAL 9.8
- TI-2004-00398 k5admind (kadmind) for Heimdal allows remote attackers to execute arbitrary code via a… CVSS 3.1CRITICAL 9.8
- TI-2022-20894 PAC parsing in MIT Kerberos 5 (aka krb5) before 1.19.4 and 1.20.x before 1.20.1 has… CVSS 3.1HIGH 8.8
- TI-2017-08165 Heimdal before 7.4 allows remote attackers to impersonate services with Orpheus' Lyre… CVSS 3.1HIGH 8.1
- TI-2022-02876 NULL pointer dereference in Heimdal Software Kerberos CVSS 3.1HIGH 7.5
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences