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Vulnerability · Published Feb 18, 2021 · Assigned by mitre

CVE-2021-26906

Medium 5.9

In plain English

A medium-severity security flaw in the asterisk package (Alpine). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.5% (higher than 85% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.9Medium
Exploit odds (30 days)2.5%top 14.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

An issue was discovered in res_pjsip_session.c in Digium Asterisk through 13.38.1; 14.x, 15.x, and 16.x through 16.16.0; 17.x through 17.9.1; and 18.x through 18.2.0, and Certified Asterisk through 16.8-cert5. An SDP negotiation vulnerability in PJSIP allows a remote server to potentially crash Asterisk by sending specific SIP responses that cause an SDP negotiation failure.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20asterisk18.2.1-r0ALPINE-CVE-2021-26906
Alpine:v3.21asterisk18.2.1-r0ALPINE-CVE-2021-26906
Alpine:v3.22asterisk18.2.1-r0ALPINE-CVE-2021-26906
Alpine:v3.23asterisk18.2.1-r0ALPINE-CVE-2021-26906
Alpine:v3.24asterisk18.2.1-r0ALPINE-CVE-2021-26906
Debian:14asterisk1:16.16.1~dfsg-1DEBIAN-CVE-2021-26906

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References