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Vulnerability · Published Jul 22, 2021 · Assigned by mitre

CVE-2021-36222

High 7.5

In plain English

A high-severity security flaw in the krb5 package (Alpine). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 10.5% (higher than 96% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)7.5High
Exploit odds (30 days)10.5%top 4.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20krb51.18.4-r0ALPINE-CVE-2021-36222
Alpine:v3.21krb51.18.4-r0ALPINE-CVE-2021-36222
Alpine:v3.22krb51.18.4-r0ALPINE-CVE-2021-36222
Alpine:v3.23krb51.18.4-r0ALPINE-CVE-2021-36222
Alpine:v3.24krb51.18.4-r0ALPINE-CVE-2021-36222
Debian:12krb51.18.3-6DEBIAN-CVE-2021-36222
Debian:13krb51.18.3-6DEBIAN-CVE-2021-36222
Debian:14krb51.18.3-6DEBIAN-CVE-2021-36222
Rocky Linux:8krb50:1.18.2-8.3.el8_4RLSA-2021:3576

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References