What is CVE-2020-35776?

CVE-2020-35776 is a buffer overflow vulnerability in Sangoma Asterisk versions 13.38.1, 16.15.1, 17.9.1, and 18.1.1 that allows a remote attacker to crash Asterisk by misusing SIP 181 responses.

How does CVE-2020-35776 affect Digium Asterisk?

CVE-2020-35776 affects Digium Asterisk versions 13.38.1, 16.15.1, 17.9.1, and 18.1.1.

What is the severity of CVE-2020-35776?

CVE-2020-35776 has a severity rating of 6.5 (Medium).

How can an attacker exploit CVE-2020-35776?

An attacker can exploit CVE-2020-35776 by deliberately misusing SIP 181 responses to cause a buffer overflow and crash Asterisk.

Are there any fixes available for CVE-2020-35776?

Yes, you can find fixes for CVE-2020-35776 in the security advisory AST-2021-001 provided by the Asterisk Project.

Vulnerability/
CVE-2020-35776

medium

6.5

CWE

120 119

18/2/2021

4/8/2024

CVE-2020-35776: Buffer Overflow

First published: Thu Feb 18 2021(Updated: )

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.

Credit: cve@mitre.org

Affected Software	Affected Version	How to fix
Digium Asterisk	>=13.0.0<=13.38.1
Digium Asterisk	>=16.0.0<=16.15.1
Digium Asterisk	>=17.0.0<=17.9.1
Digium Asterisk	>=18.0<=18.1.1

Remedy

http://packetstormsecurity.com/files/161470/Asterisk-Project-Security-Advisory-AST-2021-001.html

Remedy

https://issues.asterisk.org/jira/browse/ASTERISK-29227

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Reference Links

Frequently Asked Questions

What is CVE-2020-35776?
CVE-2020-35776 is a buffer overflow vulnerability in Sangoma Asterisk versions 13.38.1, 16.15.1, 17.9.1, and 18.1.1 that allows a remote attacker to crash Asterisk by misusing SIP 181 responses.
How does CVE-2020-35776 affect Digium Asterisk?
CVE-2020-35776 affects Digium Asterisk versions 13.38.1, 16.15.1, 17.9.1, and 18.1.1.
What is the severity of CVE-2020-35776?
CVE-2020-35776 has a severity rating of 6.5 (Medium).
How can an attacker exploit CVE-2020-35776?
An attacker can exploit CVE-2020-35776 by deliberately misusing SIP 181 responses to cause a buffer overflow and crash Asterisk.
Are there any fixes available for CVE-2020-35776?
Yes, you can find fixes for CVE-2020-35776 in the security advisory AST-2021-001 provided by the Asterisk Project.

collector/nvd-index
agent/severity
agent/author
agent/type
agent/weakness
agent/references
agent/description
agent/event
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agent/first-publish-date
agent/softwarecombine
agent/last-modified-date
agent/tags
collector/mitre-cve
source/MITRE
vendor/digium
canonical/digium asterisk
version/digium asterisk/13.0.0
version/digium asterisk/13.38.1
version/digium asterisk/16.0.0
version/digium asterisk/16.15.1
version/digium asterisk/17.0.0
version/digium asterisk/17.9.1
version/digium asterisk/18.0
version/digium asterisk/18.1.1

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