Vulnerability DatabaseCVE-2021-21375
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CVE-2021-21375
Published:March 10, 2021
Updated:July 21, 2026
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 PJSIP version 2.10 and earlier, after an initial INVITE has been sent, when two 183 responses are received, with the first one causing negotiation failure, a crash will occur. This results in a denial of service.
Related Resources (7)
https://security.gentoo.org/glsa/202107-42
https://security.alpinelinux.org/vuln/CVE-2021-21375
https://github.com/pjsip/pjproject/security/advisories/GHSA-hvq6-f89p-frvp
https://lists.debian.org/debian-lts-announce/2021/04/msg00023.html
https://lists.debian.org/debian-lts-announce/2021/05/msg00020.html
https://github.com/pjsip/pjproject/commit/97b3d7addbaa720b7ddb0af9bf6f3e443e664365
https://security-tracker.debian.org/tracker/CVE-2021-21375
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CVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Uncontrolled Resource Consumption
CWE-400
Improper Check for Unusual or Exceptional Conditions
CWE-754
EPSS
Base Score:
2.09