CVE-2021-36222

Name: CVE-2021-36222
Creator: NVD / NIST
Published: 2021-07-22T18:15:23.337+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 10.28%

Last modified Jun 17, 2026

CVE-2021-36222 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 10.28% chance of exploitation in the next 30 days.

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

7.5/10

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

EPSS Probability

10.28%

95.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-476

Affected Software

Vendor	Product	Versions
Mit	Kerberos 5	< 1.18.4
Mit	Kerberos 5	>= 1.19.0, < 1.19.2
Debian	Debian Linux	10.0
Netapp	Active Iq Unified Manager	All versions
Netapp	Oncommand Insight	All versions
Netapp	Oncommand Workflow Automation	All versions
Netapp	Snapcenter	All versions
Oracle	Mysql Server	>= 8.0.0, <= 8.0.26

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

Timeline

Published: Jul 22, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-36222?

How severe is CVE-2021-36222?

CVE-2021-36222 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 10.28% probability of exploitation in the next 30 days.

How do I fix CVE-2021-36222?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-36222?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST