Vulnerability DatabaseCVE-2020-35776
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CVE-2020-35776
Published:February 18, 2021
Updated:July 21, 2026
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.
Related Resources (8)
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://issues.asterisk.org/
http://packetstormsecurity.com/files/161470/Asterisk-Project-Security-Advisory-AST-2021-001.html
http://seclists.org/fulldisclosure/2021/Feb/57
https://issues.asterisk.org/jira/browse/ASTERISK-29227
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CVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-120
EPSS
Base Score:
3.91