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Vulnerability details: VCID-1aak-nhvz-aaan
Vulnerability ID VCID-1aak-nhvz-aaan
Aliases CVE-2021-43804
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 affected versions if the incoming RTCP BYE message contains a reason's length, this declared length is not checked against the actual received packet size, potentially resulting in an out-of-bound read access. This issue affects all users that use PJMEDIA and RTCP. A malicious actor can send a RTCP BYE message with an invalid reason length. Users are advised to upgrade as soon as possible. There are no known workarounds.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-125 Out-of-bounds Read
System Score Found at
epss 0.0025 https://api.first.org/data/v1/epss?cve=CVE-2021-43804
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epss 0.0025 https://api.first.org/data/v1/epss?cve=CVE-2021-43804
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epss 0.0025 https://api.first.org/data/v1/epss?cve=CVE-2021-43804
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epss 0.00266 https://api.first.org/data/v1/epss?cve=CVE-2021-43804
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epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-43804
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epss 0.00426 https://api.first.org/data/v1/epss?cve=CVE-2021-43804
cvssv2 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-43804
cvssv3 7.3 https://nvd.nist.gov/vuln/detail/CVE-2021-43804
cvssv3.1 7.3 https://nvd.nist.gov/vuln/detail/CVE-2021-43804
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-43804
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-37706
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43299
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43300
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43301
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43302
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43303
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43804
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43845
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-46837
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-21722
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-21723
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-23608
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-24763
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-24764
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-24786
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-24792
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-24793
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-26498
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-26499
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-26651
https://github.com/pjsip/pjproject/commit/8b621f192cae14456ee0b0ade52ce6c6f258af1e
https://github.com/pjsip/pjproject/security/advisories/GHSA-3qx3-cg72-wrh9
https://lists.debian.org/debian-lts-announce/2022/03/msg00035.html
https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html
https://lists.debian.org/debian-lts-announce/2023/08/msg00038.html
https://security.gentoo.org/glsa/202210-37
https://www.debian.org/security/2022/dsa-5285
1014998 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1014998
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:10.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
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-2021-43804 https://nvd.nist.gov/vuln/detail/CVE-2021-43804
USN-6422-1 https://usn.ubuntu.com/6422-1/
No exploits are available.
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-43804
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:N/S:U/C:L/I:L/A:L Found at https://nvd.nist.gov/vuln/detail/CVE-2021-43804
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
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L Found at https://nvd.nist.gov/vuln/detail/CVE-2021-43804
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 0.45477
EPSS Score 0.0025
Published At March 28, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.