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CVE-2020-35776

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Date: February 18, 2021

A buffer overflow in res_pjsip_diversion.c in Sangoma Asterisk versions 13.38.1, 16.15.1, 17.9.1, and 18.1.1 allows remote attacker to crash Asterisk by deliberately misusing SIP 181 responses.

Language: C

Severity Score

Related Resources (10)

https://issues.asterisk.org/
https://nvd.nist.gov/vuln/detail/CVE-2020-35776
https://issues.asterisk.org/jira/browse/ASTERISK-29227
http://seclists.org/fulldisclosure/2021/Feb/57
http://packetstormsecurity.com/files/161470/Asterisk-Project-Security-Advisory-AST-2021-001.html
https://people.canonical.com/~ubuntu-security/cve/CVE-2020-35776
https://security.alpinelinux.org/vuln/CVE-2020-35776
https://downloads.asterisk.org/pub/security/AST-2021-001.html
https://security-tracker.debian.org/tracker/CVE-2020-35776
https://www.mend.io/vulnerability-database/CVE-2020-35776

Severity Score

Weakness Type (CWE)

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CWE-120

Top Fix

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Upgrade Version

Upgrade to version 13.38.2, 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): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

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

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