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Vulnerability details: VCID-4b2x-qkf9-ebbv
Vulnerability ID VCID-4b2x-qkf9-ebbv
Aliases CVE-2021-32686
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 5.3
Risk 2.6
Affected and Fixed Packages Package Details
Weaknesses (0)
There are no known CWE.
System Score Found at
epss 0.00283 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.00283 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.00283 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.00283 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.0038 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.0038 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.0038 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.0038 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
epss 0.0038 https://api.first.org/data/v1/epss?cve=CVE-2021-32686
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-32686
cvssv3.1 5.9 https://nvd.nist.gov/vuln/detail/CVE-2021-32686
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-32686
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32558
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32686
https://github.com/pjsip/pjproject/commit/d5f95aa066f878b0aef6a64e60b61e8626e664cd
https://github.com/pjsip/pjproject/pull/2716
https://github.com/pjsip/pjproject/releases/tag/2.11.1
https://github.com/pjsip/pjproject/security/advisories/GHSA-cv8x-p47p-99wr
https://www.debian.org/security/2021/dsa-4999
991931 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=991931
cpe:2.3:a:teluu:pjsip:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:teluu:pjsip:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
CVE-2021-32686 https://nvd.nist.gov/vuln/detail/CVE-2021-32686
No exploits are available.
Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-32686
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-32686
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.51286
EPSS Score 0.00283
Published At Sept. 9, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:30:57.523773+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.21/main.json 37.0.0