CVE-2020-35776

Public Exploit

Description

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.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.10%
Vendor Advisory asterisk.org Vendor Advisory asterisk.org Vendor Advisory asterisk.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://issues.asterisk.org/ issue tracking vendor advisory
http://seclists.org/fulldisclosure/2021/Feb/57 third party advisory mailing list
https://downloads.asterisk.org/pub/security/AST-2021-001.html vendor advisory
https://issues.asterisk.org/jira/browse/ASTERISK-29227 issue tracking patch vendor advisory exploit
http://packetstormsecurity.com/files/161470/Asterisk-Project-Security-Advisory-AST-2021-001.html third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2020-35776?
CVE-2020-35776 has been scored as a medium severity vulnerability.
How to fix CVE-2020-35776?
To fix CVE-2020-35776, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-35776 being actively exploited in the wild?
It is possible that CVE-2020-35776 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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