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Vulnerability · Published Oct 12, 2021 · Assigned by redhat

CVE-2021-3671

Medium 6.5

In plain English

A medium-severity null pointer dereference in Samba. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.1% (higher than 82% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)6.5Medium
Exploit odds (30 days)2.1%top 18.1% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

A null pointer de-reference was found in the way samba kerberos server handled missing sname in TGS-REQ (Ticket Granting Server - Request). An authenticated user could use this flaw to crash the samba server.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20heimdal7.7.1-r0ALPINE-CVE-2021-3671
Alpine:v3.21heimdal7.7.1-r0ALPINE-CVE-2021-3671
Alpine:v3.22heimdal7.7.1-r0ALPINE-CVE-2021-3671
Alpine:v3.23heimdal7.7.1-r0ALPINE-CVE-2021-3671
Alpine:v3.24heimdal7.7.1-r0ALPINE-CVE-2021-3671
Alpine:v3.20samba4.15.0-r0ALPINE-CVE-2021-3671
Alpine:v3.21samba4.15.0-r0ALPINE-CVE-2021-3671
Alpine:v3.22samba4.15.0-r0ALPINE-CVE-2021-3671
Alpine:v3.23samba4.15.0-r0ALPINE-CVE-2021-3671
Alpine:v3.24samba4.15.0-r0ALPINE-CVE-2021-3671
Debian:12heimdal7.7.0+dfsg-3DEBIAN-CVE-2021-3671
Debian:13heimdal7.7.0+dfsg-3DEBIAN-CVE-2021-3671
Debian:14heimdal7.7.0+dfsg-3DEBIAN-CVE-2021-3671
Debian:12samba2:4.13.13+dfsg-1DEBIAN-CVE-2021-3671
Debian:13samba2:4.13.13+dfsg-1DEBIAN-CVE-2021-3671
Debian:14samba2:4.13.13+dfsg-1DEBIAN-CVE-2021-3671
Ubuntu:22.04:LTSsamba2:4.13.14+dfsg-0ubuntu1UBUNTU-CVE-2021-3671

Affected products (as reported)

VendorProductVersions
n/a Samba Fixed in samba 4.13.12, samba 4.14.8

Weakness: CWE-476

References