CVE-2021-36222

HighCVSS 7.5/10Last modified Oct 14, 2026

Description

ec_verify in kdc/kdc_preauth_ec.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.4 and 1.19.x before 1.19.2 allows remote attackers to cause a NULL pointer dereference and daemon crash. This occurs because a return value is not properly managed in a certain situation.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-476

Affected software

Vendor	Product	Versions
n/a	n/a	n/a
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	>= V3.1.0, < V3.1.5
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	>= V3.1.0, < V3.1.5
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	>= V3.1.0, < V3.1.5
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	>= V3.1.0, < V3.1.5
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	>= V3.1.0, < V3.1.5

References

https://github.com/krb5/krb5/commit/fc98f520caefff2e5ee9a0026fdf5109944b3562Patch, Third Party Advisory
https://github.com/krb5/krb5/releasesRelease Notes, Third Party Advisory
https://security.netapp.com/advisory/ntap-20211022-0003/Third Party Advisory
https://security.netapp.com/advisory/ntap-20211104-0007/Third Party Advisory
https://web.mit.edu/kerberos/advisories/Not Applicable
https://www.debian.org/security/2021/dsa-4944Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
https://github.com/krb5/krb5/commit/fc98f520caefff2e5ee9a0026fdf5109944b3562Patch, Third Party Advisory
https://github.com/krb5/krb5/releasesRelease Notes, Third Party Advisory
https://security.netapp.com/advisory/ntap-20211022-0003/Third Party Advisory
https://security.netapp.com/advisory/ntap-20211104-0007/Third Party Advisory
https://web.mit.edu/kerberos/advisories/Not Applicable
https://www.debian.org/security/2021/dsa-4944Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-398330.html

Timeline

Published: Jul 22, 2021
Last modified: Oct 14, 2026
NVD status: Modified

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