Medium severity · published Feb 19, 2021
CVE-2021-26713
A stack-based buffer overflow in res_rtp_asterisk.c in Sangoma Asterisk before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6 allows…
6.5
CVSS
1.9%
EPSS
No
On KEV
Description
A stack-based buffer overflow in res_rtp_asterisk.c in Sangoma Asterisk before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6 allows an authenticated WebRTC client to cause an Asterisk crash by sending multiple hold/unhold requests in quick succession. This is caused by a signedness comparison mismatch.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.9% · higher than 79% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
Asterisk · Digium
16.0.0 before 16.16.1; 17.0.0 before 17.9.2; 18.0.0 before 18.2.1 · source: NVD
CA
Certified Asterisk · Digium
16.8; 16.8; 16.8; 16.8; 16.8; 16.8; +7 more · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-26713
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-26713
Vendor Advisory
https://downloads.asterisk.org/pub/security/
Vendor Advisory
https://downloads.asterisk.org/pub/security/AST-2021-004.html
Vendor Advisory
https://issues.asterisk.org/jira/browse/ASTERISK-29205
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