CVE-2021-36222

HIGH
Published Jul 22, 20214y ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
Find Similar
Published Jul 22, 2021 4y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
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 None
Integrity None
Availability High

Threat Intelligence

No active exploitation signals — not in CISA KEV and no EPSS score yet.

Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 9

VendorProductVersionRange
mitkerberos_5* <1.18.4
mitkerberos_5*≥1.19.0  –  <1.19.2
debiandebian_linux10.0any
netappactive_iq_unified_manager*any
netappactive_iq_unified_manager*any
netapponcommand_insight*any
netapponcommand_workflow_automation*any
netappsnapcenter*any
oraclemysql_server*≥8.0.0  –  ≤8.0.26

References 7

  • github.com https://github.com/krb5/krb5/commit/fc98f520caefff2e5ee9a0026fdf5109944b3562
    PatchThird Party Advisory
  • github.com https://github.com/krb5/krb5/releases
    Release NotesThird Party Advisory
  • security.netapp.com https://security.netapp.com/advisory/ntap-20211022-0003/
    Third Party Advisory
  • security.netapp.com https://security.netapp.com/advisory/ntap-20211104-0007/
    Third Party Advisory
  • web.mit.edu https://web.mit.edu/kerberos/advisories/
    Not Applicable
  • debian.org https://www.debian.org/security/2021/dsa-4944
    Third Party Advisory
  • oracle.com https://www.oracle.com/security-alerts/cpuoct2021.html
    PatchThird Party Advisory

Remediation

  • github.com https://github.com/krb5/krb5/commit/fc98f520caefff2e5ee9a0026fdf5109944b3562
    PatchThird Party Advisory
  • oracle.com https://www.oracle.com/security-alerts/cpuoct2021.html
    PatchThird Party Advisory