CVE-2026-60109

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/zeek/zeek/commit/c82e3c734893d932e94310aec0dbeb1ffcea169d	Patch
https://github.com/zeek/zeek/releases/tag/v8.0.9	Release Notes
https://www.vulncheck.com/advisories/zeek-null-pointer-dereference-dos-via-kerberos-krb-error-parsing	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:zeek:zeek:*:*:*:*:*:*:*:*

History

23 Oct 2026, 23:10

Type	Values Removed	Values Added
Summary		(es) Zeek anterior a 8.0.9 contiene una vulnerabilidad de desreferencia de puntero nulo en su analizador del protocolo Kerberos que permite a atacantes remotos no autenticados bloquear el sensor enviando un mensaje KRB_ERROR manipulado con código de error 25 (KDC_ERR_PREAUTH_REQUIRED) que contiene un elemento PA-DATA con tipo de padata 2, 3, 11 o 19. Los atacantes pueden explotar una falta de coincidencia de estado entre el analizador sintáctico y el analizador donde proc_padata() desreferencia un campo pa_data_element no inicializado seleccionado por la rama de análisis incorrecta, lo que desencadena un bloqueo a través de un único paquete UDP o TCP al puerto 88 sin credenciales ni autenticación previa.

Information

Published : 2026-07-09 15:16

Updated : 2026-10-23 23:10

NVD link : CVE-2026-60109

Mitre link : CVE-2026-60109

CVE.ORG link : CVE-2026-60109

JSON object : View

Products Affected

zeek

zeek

CWE

CWE-476

NULL Pointer Dereference

{"id": "CVE-2026-60109", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-60109", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-09T18:17:17.788848Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 8.7, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "disclosure@vulncheck.com", "affectedData": [{"repo": "https://github.com/zeek/zeek", "vendor": "zeek", "product": "zeek", "versions": [{"status": "affected", "version": "0", "lessThan": "8.0.9", "versionType": "semver"}], "packageURL": "pkg:github/zeek/zeek", "defaultStatus": "affected"}]}], "published": "2026-07-09T15:16:41.757", "references": [{"url": "https://github.com/zeek/zeek/commit/c82e3c734893d932e94310aec0dbeb1ffcea169d", "tags": ["Patch"], "source": "disclosure@vulncheck.com"}, {"url": "https://github.com/zeek/zeek/releases/tag/v8.0.9", "tags": ["Release Notes"], "source": "disclosure@vulncheck.com"}, {"url": "https://www.vulncheck.com/advisories/zeek-null-pointer-dereference-dos-via-kerberos-krb-error-parsing", "tags": ["Third Party Advisory"], "source": "disclosure@vulncheck.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "description": [{"lang": "en", "value": "CWE-476"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Zeek anterior a 8.0.9 contiene una vulnerabilidad de desreferencia de puntero nulo en su analizador del protocolo Kerberos que permite a atacantes remotos no autenticados bloquear el sensor enviando un mensaje KRB_ERROR manipulado con c\u00f3digo de error 25 (KDC_ERR_PREAUTH_REQUIRED) que contiene un elemento PA-DATA con tipo de padata 2, 3, 11 o 19. Los atacantes pueden explotar una falta de coincidencia de estado entre el analizador sint\u00e1ctico y el analizador donde proc_padata() desreferencia un campo pa_data_element no inicializado seleccionado por la rama de an\u00e1lisis incorrecta, lo que desencadena un bloqueo a trav\u00e9s de un \u00fanico paquete UDP o TCP al puerto 88 sin credenciales ni autenticaci\u00f3n previa."}], "lastModified": "2026-10-23T23:10:00.157", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:zeek:zeek:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E2F2065C-E8FE-484B-A46B-46E84E45F8D2", "versionEndExcluding": "8.0.9"}], "operator": "OR"}]}], "sourceIdentifier": "disclosure@vulncheck.com"}