Medium severity · published Feb 18, 2021
CVE-2020-35776
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…
6.5
CVSS
4.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)4.1% · higher than 91% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
Asterisk · Digium
13.0.0 through 13.38.1; 16.0.0 through 16.15.1; 17.0.0 through 17.9.1; 18.0 through 18.1.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-35776
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-35776
Patch
http://packetstormsecurity.com/files/161470/Asterisk-Project-Security-Advisory-AST-2021-001.html
Mailing List
http://seclists.org/fulldisclosure/2021/Feb/57
Vendor Advisory
https://downloads.asterisk.org/pub/security/AST-2021-001.html
Issue Tracking
https://issues.asterisk.org/
Exploit
https://issues.asterisk.org/jira/browse/ASTERISK-29227
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