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Vulnerability · Published Feb 18, 2021 · Assigned by mitre

CVE-2021-26717

High 7.5

In plain English

A high-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 2.2% (higher than 83% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)7.5High
Exploit odds (30 days)2.2%top 17.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

An issue was discovered in Sangoma Asterisk 16.x before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6. When re-negotiating for T.38, if the initial remote response was delayed just enough, Asterisk would send both audio and T.38 in the SDP. If this happened, and the remote responded with a declined T.38 stream, then Asterisk would crash.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20asterisk18.2.1-r0ALPINE-CVE-2021-26717
Alpine:v3.21asterisk18.2.1-r0ALPINE-CVE-2021-26717
Alpine:v3.22asterisk18.2.1-r0ALPINE-CVE-2021-26717
Alpine:v3.23asterisk18.2.1-r0ALPINE-CVE-2021-26717
Alpine:v3.24asterisk18.2.1-r0ALPINE-CVE-2021-26717
Debian:14asterisk1:16.16.1~dfsg-1DEBIAN-CVE-2021-26717
Ubuntu:22.04:LTSasteriskno fix listedUBUNTU-CVE-2021-26717
Ubuntu:24.04:LTSasteriskno fix listedUBUNTU-CVE-2021-26717
Ubuntu:25.10asteriskno fix listedUBUNTU-CVE-2021-26717
Ubuntu:26.04:LTSasteriskno fix listedUBUNTU-CVE-2021-26717
Ubuntu:26.10asteriskno fix listedUBUNTU-CVE-2021-26717

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References