High severity · published Jul 30, 2021
CVE-2021-32558
An issue was discovered in Sangoma Asterisk 13.x before 13.38.3, 16.x before 16.19.1, 17.x before 17.9.4, and 18.x before 18.5.1, and Certified Asterisk before 16.8-cert10
7.5
CVSS
9.2%
EPSS
No
On KEV
Description
An issue was discovered in Sangoma Asterisk 13.x before 13.38.3, 16.x before 16.19.1, 17.x before 17.9.4, and 18.x before 18.5.1, and Certified Asterisk before 16.8-cert10. If the IAX2 channel driver receives a packet that contains an unsupported media format, a crash can occur.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)9.2% · higher than 95% 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 before 13.38.3; 16.0.0 before 16.19.1; 17.0.0 before 17.9.4; 18.0.0 before 18.15.1 · source: NVD
CA
Certified Asterisk · Digium
16.8; 16.8; 16.8; 16.8; 16.8; 16.8; +11 more · source: NVD
DL
Debian Linux · Debian
9.0; 11.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-32558
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-32558
Patch
http://packetstormsecurity.com/files/163639/Asterisk-Project-Security-Advisory-AST-2021-008.html
Mailing List
http://seclists.org/fulldisclosure/2021/Jul/49
Patch
https://downloads.asterisk.org/pub/security/AST-2021-008.html
Exploit
https://issues.asterisk.org/jira/browse/ASTERISK-29392
Mailing List
https://lists.debian.org/debian-lts-announce/2021/08/msg00005.html
Third Party Advisory
https://www.debian.org/security/2021/dsa-4999
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