AUGUST 4, 2026
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Case File

CVE-2021-21375

MEDIUM · CVSS 6.5 EPSS 2.09% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-03-10 · Last synced 2026-08-04

CyberRota Analysis

AI analysis pending.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links
github.com ↗ github.com ↗

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2021-21375
Severity
MEDIUM
CVSS
6.5
EPSS
2.09%

Original NVD 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 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.