Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2021-37706

Severity CVSS v4.0:
Pending analysis
Type:
CWE-191 Integer Underflow (Wrap or Wraparound)
Publication date:
22/12/2021
Last modified:
04/11/2025

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.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L CVSS v3.1 Severity and Metrics:

Base Score: 7.30 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): Low
Integrity (I): Low
Availability (A): Low

Base Score 3.x
7.30
Severity 3.x
HIGH
Vector 2.0
AV:N/AC:M/Au:N/C:C/I:C/A:C CVSS v2.0 Severity and Metrics:

Base Score: 9.30 HIGH
Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C

Attack Vector (AV): Network
Attack Complexity (AC): Medium
Authentication (Au): None
Confidentiality (C): Complete
Integrity (I): Complete
Availability (A): Complete

Base Score 2.0
9.30
Severity 2.0
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:teluu:pjsip:*:*:*:*:*:*:*:* 2.11.1 (including)
cpe:2.3:a:asterisk:certified_asterisk:*:*:*:*:*:*:*:* 16.8.0 (excluding)
cpe:2.3:a:asterisk:certified_asterisk:16.8.0:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert1:*:*:*:*:*:*
cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert10:*:*:*:*:*:*
cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert11:*:*:*:*:*:*
cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert12:*:*:*:*:*:*
cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert2:*:*:*:*:*:*
cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert3:*:*:*:*:*:*
cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert4:*:*:*:*:*:*
cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert5:*:*:*:*:*:*
cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert6:*:*:*:*:*:*
cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert7:*:*:*:*:*:*
cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert8:*:*:*:*:*:*
cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert9:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools