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CVE-2021-37706

CRITICALCVSS 9.8/10EPSS 4.62%

Last modified

CVE-2021-37706 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 4.62% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
4.62%

90.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
TeluuPjsip<= 2.11.1
AsteriskCertified Asterisk< 16.8.0
AsteriskCertified Asterisk16.8.0
SangomaAsterisk>= 16.0.0, < 16.24.1
SangomaAsterisk>= 18.0.0, < 18.10.1
SangomaAsterisk>= 19.0.0, < 19.2.1
DebianDebian Linux9.0
DebianDebian Linux10.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-37706?
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.
How severe is CVE-2021-37706?
CVE-2021-37706 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 4.62% probability of exploitation in the next 30 days.
How do I fix CVE-2021-37706?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-37706?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST