GHSA-76hq-67jv-x5j7
Zeek versions before 8.0.9 contain a null pointer dereference vulnerability in the Kerberos protocol analyzer. This flaw allows unauthenticated remote attackers to crash the sensor by sending a specially crafted KRB_ERROR message with error-code 25 containing certain PA-DATA elements. The vulnerability arises from a parser and analyzer state mismatch that leads to dereferencing an uninitialized field, causing a crash via a single UDP or TCP packet to port 88 without authentication.
AI Analysis
Technical Summary
The vulnerability in Zeek before version 8.0.9 is a null pointer dereference in the Kerberos protocol analyzer. It occurs when an attacker sends a crafted KRB_ERROR message with error-code 25 (KDC_ERR_PREAUTH_REQUIRED) that includes a PA-DATA element with padata-type 2, 3, 11, or 19. The proc_padata() function dereferences an uninitialized pa_data_element field due to a mismatch between the parser and analyzer state, resulting in a crash of the Zeek sensor. Exploitation requires only a single UDP or TCP packet to port 88 and no credentials or prior authentication.
Potential Impact
Successful exploitation causes a denial of service by crashing the Zeek sensor, potentially disrupting network monitoring and security visibility. There is no indication of code execution or data compromise from the provided information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider restricting access to port 88 from untrusted sources to reduce exposure.
GHSA-76hq-67jv-x5j7
Description
Zeek versions before 8.0.9 contain a null pointer dereference vulnerability in the Kerberos protocol analyzer. This flaw allows unauthenticated remote attackers to crash the sensor by sending a specially crafted KRB_ERROR message with error-code 25 containing certain PA-DATA elements. The vulnerability arises from a parser and analyzer state mismatch that leads to dereferencing an uninitialized field, causing a crash via a single UDP or TCP packet to port 88 without authentication.
CVSS v4.0
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in Zeek before version 8.0.9 is a null pointer dereference in the Kerberos protocol analyzer. It occurs when an attacker sends a crafted KRB_ERROR message with error-code 25 (KDC_ERR_PREAUTH_REQUIRED) that includes a PA-DATA element with padata-type 2, 3, 11, or 19. The proc_padata() function dereferences an uninitialized pa_data_element field due to a mismatch between the parser and analyzer state, resulting in a crash of the Zeek sensor. Exploitation requires only a single UDP or TCP packet to port 88 and no credentials or prior authentication.
Potential Impact
Successful exploitation causes a denial of service by crashing the Zeek sensor, potentially disrupting network monitoring and security visibility. There is no indication of code execution or data compromise from the provided information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider restricting access to port 88 from untrusted sources to reduce exposure.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-76hq-67jv-x5j7
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-60109"]
- Ecosystems
- []
- Database Specific Severity
- HIGH
- Cvss Version
- 4.0
Threat ID: 6a50bab468715ace43585c84
Added to database: 07/10/2026, 09:26:12 UTC
Last enriched: 07/10/2026, 10:19:15 UTC
Last updated: 07/10/2026, 10:19:15 UTC
Views: 3
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