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.
https://github.com/krb5/krb5/releases
https://web.mit.edu/kerberos/advisories/
https://github.com/krb5/krb5/commit/fc98f520caefff2e5ee9a0026fdf5109944b3562
https://www.debian.org/security/2021/dsa-4944
https://www.oracle.com/security-alerts/cpuoct2021.html
Source: MITRE
Published: 2021-07-22
Updated: 2021-11-28
Type: CWE-476
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 10
Severity: MEDIUM
Base Score: 7.5
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 3.9
Severity: HIGH