CVE-2021-32686

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 before version 2.11.1, there are a couple of
issues found in the SSL socket. First, a race condition between callback
and destroy, due to the accepted socket having no group lock. Second, the
SSL socket parent/listener may get destroyed during handshake. Both issues
were reported to happen intermittently in heavy load TLS connections. They
cause a crash, resulting in a denial of service. These are fixed in version
2.11.1.