CVE-2026-60109
Zeek < 8.0.9 Null Pointer Dereference DoS via Kerberos KRB_ERROR Parsing
- State
- Published
- Severity
- 8.7 High
- Published
- Jul 9, 2026
- Updated
- Jul 14, 2026
- Reserved
- Jul 8, 2026
Description
Zeek before 8.0.9 contains a null pointer dereference vulnerability in its Kerberos protocol analyzer that allows unauthenticated remote attackers to crash the sensor by sending a crafted KRB_ERROR message with error-code 25 (KDC_ERR_PREAUTH_REQUIRED) containing a PA-DATA element with padata-type 2, 3, 11, or 19. Attackers can exploit a parser and analyzer state mismatch where proc_padata() dereferences an uninitialized pa_data_element field selected by the wrong parsing arm, triggering a crash via a single UDP or TCP packet to port 88 without any credentials or prior authentication.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | VulnCheck |
Weaknesses
- CWE-476 NULL Pointer Dereference
Affected Products
| Product | Versions |
|---|---|
zeekzeek |
|
References
- Release Notesrelease-notes
- Patch Commitpatch
- https://www.vulncheck.com/advisories/zeek-null-pointer-dereference-dos-via-kerberos-krb-error-parsingthird-party-advisory
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