CVE-2026-60109Zeek < 8.0.9 Null Pointer Dereference DoS via Kerberos KRB_ERROR Parsing

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.

8.7 HIGHEPSS 0.92%Not in KEVNVD: Analyzed

Last updated: 2026-10-23 23:10 UTC

OverviewCVSS details

8.7HIGHCVSS 4.0

Score source: VulnCheck (CNA)
NVD status: Analyzed
Published: Jul 9, 2026
Assigner: VulnCheck

Affected

zeek (zeek)

Versions: before 8.0.9
Fixed in: 8.0.9

Exploitation

Public exploit: None listed
CISA KEV: Not listed
KEV due date: —
SSVC: Exploitation none · Automatable yes · Impact partial

EPSS · FIRST, scored Nov 7

0.92%chance of exploitation in 30 days

Higher than 60.60% of CVEs

CVSS 4.0 · VulnCheck (CNA)

8.7High

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

Attack vector: Network
Attack complexity: Low
Attack requirements: None
Privileges required: None
User interaction: None
Confidentiality impact: None
Integrity impact: None
Availability impact: High
Confidentiality (other systems): None
Integrity (other systems): None
Availability (other systems): None

CVSS 3.1 · VulnCheck (CNA)

7.5High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
8.7	HIGH	4.0VulnCheck (CNA)	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
7.5	HIGH	3.1VulnCheck (CNA)	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Details

CVE ID: CVE-2026-60109
Status: Analyzed
Assigner (CNA): VulnCheck
Published: Jul 9, 2026
Last modified: 2026-10-23 23:10 UTC
Weaknesses: CWE-476 · NULL Pointer Dereference

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 07:30 UTC.