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CVE-2021-43804

Out-of-bounds read when parsing RTCP BYE message in PJSIP

7.3 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
Low

Exploit likelihood

2.29%Up 1.7 points since Dec 23, 2021
90%50%10%1%

What each source reports

CVE List Score used 7.3

Out-of-bounds read when parsing RTCP BYE message in PJSIP

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.

Record
CVE-2021-43804
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Weakness
CWE-125
Updated
2026-11-02
EUVDEUVD-2021-30695 7.3

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.

Record
EUVD-2021-30695
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02
NVD 7.3

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.

Record
CVE-2021-43804
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CVSS 2.0
7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness
CWE-125
Updated
2026-11-02
OSVALPINE-CVE-2021-43804 7.3

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.

Record
ALPINE-CVE-2021-43804
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02
OSV 7.3

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.

Record
CVE-2021-43804
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02
OSVDEBIAN-CVE-2021-43804 7.3

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.

Record
DEBIAN-CVE-2021-43804
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02
OSVUBUNTU-CVE-2021-43804 7.3

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.

Record
UBUNTU-CVE-2021-43804
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02
OSVUSN-6422-1 No score

ring vulnerabilities

It was discovered that Ring incorrectly handled certain inputs. If a user or an automated system were tricked into opening a specially crafted input file, a remote attacker could possibly use this issue to execute arbitrary code. (CVE-2021-37706)

It was discovered that Ring incorrectly handled certain inputs. If a user or an automated system were tricked into opening a specially crafted input file, a remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2021-43299, CVE-2021-43300, CVE-2021-43301, CVE-2021-43302, CVE-2021-43303, CVE-2021-43804, CVE-2021-43845, CVE-2022-21723, CVE-2022-23537, CVE-2022-23547, CVE-2022-23608, CVE-2022-24754, CVE-2022-24763, CVE-2022-24764, CVE-2022-24793, CVE-2022-31031, CVE-2022-39244)

It was discovered that Ring incorrectly handled certain inputs. If a user or an automated system were tricked into opening a specially crafted input file, a remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2022-21722)

It was discovered that Ring incorrectly handled certain inputs. If a user or an automated system were tricked into opening a specially crafted input file, a remote attacker could possibly use this issue to cause a denial of service. (CVE-2023-27585)

Record
USN-6422-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
pjproject
Alpine:v3.16
before 2.12-r0
2.12-r0
pjproject
Alpine:v3.17
before 2.12-r0
2.12-r0
pjproject
Alpine:v3.18
before 2.12-r0
2.12-r0
pjproject
Alpine:v3.19
before 2.12-r0
2.12-r0
pjproject
Alpine:v3.20
before 2.12-r0
2.12-r0
pjproject
Alpine:v3.21
before 2.12-r0
2.12-r0
pjproject
Alpine:v3.22
before 2.12-r0
2.12-r0
pjproject
Alpine:v3.23
before 2.12-r0
2.12-r0
pjproject
Alpine:v3.24
before 2.12-r0
2.12-r0
asterisk
Debian:14
before 1:18.12.0~dfsg+~cs6.12.40431413-1, plus listed versions
0.1.11-30.1.11-3woody11:1.0.5-21:1.0.5-41:1.0.6-1
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1:1.0.6-21:1.0.7-11:1.0.7.dfsg.1-11:1.0.7.dfsg.1-21:1.0.7.dfsg.1-2sarge11:1.0.7.dfsg.1-2sarge21:1.0.7.dfsg.1-2sarge31:1.0.7.dfsg.1-2sarge41:1.0.7.dfsg.1-2sarge51:1.0.7.dfsg.1-2sarge61:1.0.9.dfsg-11:1.0.9.dfsg-31:1.0.9.dfsg-41:1.0.9.dfsg-51:1.0.9.dfsg-61:1.2.0-beta1.dfsg-11:1.2.0-beta2.dfsg-11:1.2.0-beta2.dfsg-21:1.2.0-beta2.dfsg-31:1.2.0-rc1.dfsg-11:1.2.0-rc2.dfsg-11:1.2.0.dfsg-11:1.2.0.dfsg-21:1.2.0.dfsg-31:1.2.0.dfsg-41:1.2.0.dfsg-51:1.2.0.dfsg-61:1.2.1.dfsg-11:1.2.1.dfsg-21:1.2.1.dfsg-31:1.2.10.dfsg-11:1.2.10.dfsg-1bpo11:1.2.10.dfsg-21:1.2.10.dfsg-31:1.2.11.dfsg-11:1.2.12.1.dfsg-11:1.2.13~dfsg-11:1.2.13~dfsg-21:1.2.13~dfsg-2etch11:1.2.13~dfsg-2etch21:1.2.13~dfsg-2etch31:1.2.13~dfsg-2etch41:1.2.14~dfsg-11:1.2.14~dfsg-21:1.2.14~dfsg-3
1:18.12.0~dfsg+~cs6.12.40431413-1
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Affected packages
PackageAffectedFixed
ring
Debian:12
before 20230206.0~ds1-1
20230206.0~ds1-1
pjproject
Debian:9
From an advisory covering 15 CVEs
before 2.5.5~dfsg-6+deb9u3, plus listed versions
2.5.5~dfsg-62.5.5~dfsg-6+deb9u12.5.5~dfsg-6+deb9u2
2.5.5~dfsg-6+deb9u3
asterisk
Debian:10
From an advisory covering 20 CVEs
before 1:16.28.0~dfsg-0+deb10u1, plus listed versions
1:16.10.0~dfsg-11:16.12.0~dfsg-11:16.15.0~dfsg-11:16.15.1~dfsg-11:16.16.1~dfsg+~2.10-1
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1:16.16.1~dfsg+~2.10-21:16.16.1~dfsg-11:16.16.1~dfsg-1~bpo10+11:16.16.1~dfsg-21:16.16.1~dfsg-31:16.16.1~dfsg-41:16.2.1~dfsg-11:16.2.1~dfsg-1+deb10u11:16.2.1~dfsg-1+deb10u21:16.2.1~dfsg-21:16.23.0~dfsg+~2.10-11:16.23.0~dfsg+~cs6.10.20220309-11:16.23.0~dfsg+~cs6.10.20220309-21:16.23.0~dfsg+~cs6.10.40431411-1
1:16.28.0~dfsg-0+deb10u1
ring
Debian:10
From an advisory covering 20 CVEs
before 20190215.1.f152c98~ds1-1+deb10u2, plus listed versions
20190215.1.f152c98~ds1-120190215.1.f152c98~ds1-1+deb10u1
20190215.1.f152c98~ds1-1+deb10u2
ring
Debian:11
From an advisory covering 21 CVEs
before 20210112.2.b757bac~ds1-1+deb11u1, plus listed versions
20210112.2.b757bac~ds1-1
20210112.2.b757bac~ds1-1+deb11u1
asterisk
Debian:11
From an advisory covering 20 CVEs
before 1:16.28.0~dfsg-0+deb11u1, plus listed versions
1:16.16.1~dfsg+~2.10-11:16.16.1~dfsg+~2.10-21:16.16.1~dfsg-11:16.16.1~dfsg-1+deb11u11:16.16.1~dfsg-1+deb11u1~bpo10+1
Show 7 moreShow less
1:16.16.1~dfsg-21:16.16.1~dfsg-31:16.16.1~dfsg-41:16.23.0~dfsg+~2.10-11:16.23.0~dfsg+~cs6.10.20220309-11:16.23.0~dfsg+~cs6.10.20220309-21:16.23.0~dfsg+~cs6.10.40431411-1
1:16.28.0~dfsg-0+deb11u1
pjproject
Ubuntu:Pro:16.04:LTS
All versions, plus listed versions
2.1.0.0.ast20130823-12.1.0.0.ast20130823-1+deb8u1build0.16.04.12.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1
None known
pjproject
Ubuntu:Pro:18.04:LTS
All versions, plus listed versions
2.6~dfsg-22.7~dfsg-12.7.1~dfsg-12.7.1~dfsg-1build12.7.2~dfsg-12.7.2~dfsg-1ubuntu0.1~esm1
None known
ring
Ubuntu:Pro:18.04:LTS
before 20180228.1.503da2b~ds1-1ubuntu0.1~esm1, plus listed versions
20170803.2.5fcfe3f~dfsg1-120171024.1.eadbdeb~ds1-120171129.2.cf5bbff~ds1-120171129.2.cf5bbff~ds1-220180119.1.9e06f94~ds1-1
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20180119.1.9e06f94~ds1-320180222.1.7bffde2~ds2-220180228.1.503da2b~ds1-120180228.1.503da2b~ds1-1build1
20180228.1.503da2b~ds1-1ubuntu0.1~esm1
ring
Ubuntu:20.04:LTS
before 20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1, plus listed versions
20190215.1.f152c98~ds1-120190215.1.f152c98~ds1-1build120190215.1.f152c98~ds1-1build2
20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1
ring
Ubuntu:Pro:18.04:LTS
From an advisory covering 20 CVEs
before 20180228.1.503da2b~ds1-1ubuntu0.1~esm1, plus listed versions
20170803.2.5fcfe3f~dfsg1-120171024.1.eadbdeb~ds1-120171129.2.cf5bbff~ds1-120171129.2.cf5bbff~ds1-220180119.1.9e06f94~ds1-1
Show 4 moreShow less
20180119.1.9e06f94~ds1-320180222.1.7bffde2~ds2-220180228.1.503da2b~ds1-120180228.1.503da2b~ds1-1build1
20180228.1.503da2b~ds1-1ubuntu0.1~esm1
ring
Ubuntu:20.04:LTS
From an advisory covering 20 CVEs
before 20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1, plus listed versions
20190215.1.f152c98~ds1-120190215.1.f152c98~ds1-1build120190215.1.f152c98~ds1-1build2
20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-43804 is a high vulnerability (CVSS 7.3) in Teluu Pjsip, published December 22, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.29%, the 83rd percentile. Fixed in pjproject 2.12-r0.

References

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Left out here: 203 versions. The JSON record has them.

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