CVE-2021-37706
moderate-risk
Published 2021-12-22
PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In affected versions if the incoming STUN message contains an ERROR-CODE attribute, the header length is not checked before performing a subtraction operation, potentially resulting in an integer underflow scenario. This issue affects all users that use STUN. A malicious actor located within the victim’s network may forge and send a specially crafted UDP (STUN) message that could remotely execute arbitrary code on the victim’s machine. Users are advised to upgrade as soon as possible. There are no known workarounds.
Do I need to act?
-
0.25% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.3/10
High
NETWORK
/ LOW complexity
Affected Products (18)
Certified Asterisk
Certified Asterisk
Certified Asterisk
Certified Asterisk
Certified Asterisk
Certified Asterisk
Certified Asterisk
Certified Asterisk
Certified Asterisk
Certified Asterisk
Certified Asterisk
Certified Asterisk
Certified Asterisk
Certified Asterisk
References (19)
Third Party Advisory
http://packetstormsecurity.com/files/166225/Asterisk-Project-Security-Advisory-A...
Mailing List
http://seclists.org/fulldisclosure/2022/Mar/0
Third Party Advisory
https://security.gentoo.org/glsa/202210-37
Third Party Advisory
https://www.debian.org/security/2022/dsa-5285
Third Party Advisory
http://packetstormsecurity.com/files/166225/Asterisk-Project-Security-Advisory-A...
Mailing List
http://seclists.org/fulldisclosure/2022/Mar/0
Third Party Advisory
https://security.gentoo.org/glsa/202210-37
Third Party Advisory
https://www.debian.org/security/2022/dsa-5285
46
/ 100
moderate-risk
Severity
26/34 · High
Exploitability
1/34 · Minimal
Exposure
19/34 · Moderate