---
id: CVE-2021-36222
title: >-
  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
summary: >-
  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 …
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
vendor: mit
product: kerberos_5
affected:
  - kerberos_5 < 1.18.4
  - 'kerberos_5 >= 1.19.0, < 1.19.2'
  - debian_linux = 10.0
  - active_iq_unified_manager
  - oncommand_insight
  - oncommand_workflow_automation
  - snapcenter
  - 'mysql_server >= 8.0.0, <= 8.0.26'
patched:
  - kerberos_5 1.19.2
published: '2021-07-22'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T12:17:14.713'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-36222'
references:
  - url: >-
      https://github.com/krb5/krb5/commit/fc98f520caefff2e5ee9a0026fdf5109944b3562
    label: cve@mitre.org
  - url: 'https://github.com/krb5/krb5/releases'
    label: cve@mitre.org
  - url: 'https://security.netapp.com/advisory/ntap-20211022-0003/'
    label: cve@mitre.org
  - url: 'https://security.netapp.com/advisory/ntap-20211104-0007/'
    label: cve@mitre.org
  - url: 'https://web.mit.edu/kerberos/advisories/'
    label: cve@mitre.org
  - url: 'https://www.debian.org/security/2021/dsa-4944'
    label: cve@mitre.org
  - url: 'https://www.oracle.com/security-alerts/cpuoct2021.html'
    label: cve@mitre.org
  - url: >-
      https://github.com/krb5/krb5/commit/fc98f520caefff2e5ee9a0026fdf5109944b3562
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://github.com/krb5/krb5/releases'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20211022-0003/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20211104-0007/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://web.mit.edu/kerberos/advisories/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.debian.org/security/2021/dsa-4944'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.oracle.com/security-alerts/cpuoct2021.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.10276
epssPercentile: 0.95609
ingestedAt: '2026-10-14T12:29:10.823Z'
---

## Overview

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

- `kerberos_5 < 1.18.4`
- `kerberos_5 >= 1.19.0, < 1.19.2`
- `debian_linux = 10.0`
- `active_iq_unified_manager`
- `oncommand_insight`
- `oncommand_workflow_automation`
- `snapcenter`
- `mysql_server >= 8.0.0, <= 8.0.26`

## Remediation

Upgrade past the affected range:

- `kerberos_5 1.19.2`