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CVE-2021-26717

Good to know:

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Date: February 18, 2021

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.

Language: C

Severity Score

Related Resources (10)

https://issues.asterisk.org/jira/browse/ASTERISK-29203
http://seclists.org/fulldisclosure/2021/Feb/58
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-26717
https://downloads.asterisk.org/pub/security/
https://downloads.asterisk.org/pub/security/AST-2021-002.html
https://security-tracker.debian.org/tracker/CVE-2021-26717
https://nvd.nist.gov/vuln/detail/CVE-2021-26717
http://packetstormsecurity.com/files/161471/Asterisk-Project-Security-Advisory-AST-2021-002.html
https://security.alpinelinux.org/vuln/CVE-2021-26717
https://www.mend.io/vulnerability-database/CVE-2021-26717

Severity Score

Weakness Type (CWE)

Insufficient Information

NVD-CWE-noinfo

Top Fix

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Upgrade to version 16.16.1, 17.9.2, 18.2.1

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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