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Vulnerability details: VCID-838t-v84y-6fgb
Vulnerability ID VCID-838t-v84y-6fgb
Aliases CVE-2021-21375
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 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.
Status Published
Exploitability 0.5
Weighted Severity 5.9
Risk 3.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-754 Improper Check for Unusual or Exceptional Conditions
System Score Found at
epss 0.02312 https://api.first.org/data/v1/epss?cve=CVE-2021-21375
epss 0.02312 https://api.first.org/data/v1/epss?cve=CVE-2021-21375
epss 0.02312 https://api.first.org/data/v1/epss?cve=CVE-2021-21375
epss 0.02312 https://api.first.org/data/v1/epss?cve=CVE-2021-21375
epss 0.02312 https://api.first.org/data/v1/epss?cve=CVE-2021-21375
epss 0.02312 https://api.first.org/data/v1/epss?cve=CVE-2021-21375
epss 0.02312 https://api.first.org/data/v1/epss?cve=CVE-2021-21375
epss 0.02312 https://api.first.org/data/v1/epss?cve=CVE-2021-21375
epss 0.02312 https://api.first.org/data/v1/epss?cve=CVE-2021-21375
epss 0.02312 https://api.first.org/data/v1/epss?cve=CVE-2021-21375
epss 0.02312 https://api.first.org/data/v1/epss?cve=CVE-2021-21375
epss 0.02312 https://api.first.org/data/v1/epss?cve=CVE-2021-21375
epss 0.02312 https://api.first.org/data/v1/epss?cve=CVE-2021-21375
epss 0.02312 https://api.first.org/data/v1/epss?cve=CVE-2021-21375
epss 0.02312 https://api.first.org/data/v1/epss?cve=CVE-2021-21375
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-21375
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2021-21375
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-21375
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21375
https://github.com/pjsip/pjproject/commit/97b3d7addbaa720b7ddb0af9bf6f3e443e664365
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://security.gentoo.org/glsa/202107-42
986815 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=986815
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: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-2021-21375 https://nvd.nist.gov/vuln/detail/CVE-2021-21375
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-2021-21375
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:L/PR:N/UI:R/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-21375
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 0.84122
EPSS Score 0.02312
Published At Aug. 15, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:30:55.253842+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.16/main.json 37.0.0