What’s Vulnerable › Vulnerabilities

CVE-2021-36222

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 10.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-07-22 · updated 2026-10-14
• Weakness: CWE-476

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.

Affected products

• Debian Linux: 10.0
• MIT Kerberos 5: before 1.18.4; from 1.19.0 before 1.19.2 — fixed in 1.18.4, 1.19.2
• Active IQ Unified Manager for VMware vSphere, Linux, and Microsoft Windows: all versions
• OnCommand Insight: all versions
• NetApp OnCommand Workflow Automation: all versions
• NetApp SnapCenter: all versions
• MySQL Server: from 8.0.0 through 8.0.26

How to fix

Upgrade to a fixed version: MIT Kerberos 5 1.18.4, 1.19.2. Check the vendor advisory for mitigations.

References

• https://github.com/krb5/krb5/commit/fc98f520caefff2e5ee9a0026fdf5109944b3562
• https://github.com/krb5/krb5/releases
• https://security.netapp.com/advisory/ntap-20211022-0003/
• https://security.netapp.com/advisory/ntap-20211104-0007/
• https://web.mit.edu/kerberos/advisories/
• https://www.debian.org/security/2021/dsa-4944
• https://www.oracle.com/security-alerts/cpuoct2021.html
• https://github.com/krb5/krb5/commit/fc98f520caefff2e5ee9a0026fdf5109944b3562
• https://github.com/krb5/krb5/releases
• https://security.netapp.com/advisory/ntap-20211022-0003/
• https://security.netapp.com/advisory/ntap-20211104-0007/
• https://web.mit.edu/kerberos/advisories/

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