CVE & CISA-KEV Catalog

CVE-2021-43300

CRITICALEPSS 82th pctl

9.8

CVSS v3

Description

Stack overflow in PJSUA API when calling pjsua_recorder_create. An attacker-controlled 'filename' argument may cause a buffer overflow since it is copied to a fixed-size stack buffer without any size validation.

CWE-121Stack-based Buffer Overflow CWE-787Out-of-bounds Write

How to fix

Remediation Available

asteriskDebian

Fixed in:1:16.28.0~dfsg-0+deb11u1CVE-2021-43300

Fixed in:1:18.11.1~dfsg+~cs6.10.40431413-1CVE-2021-43300

jamiUbuntu

Fixed in:20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1USN-6422-1

Fixed in:20230206.0~ds1-5ubuntu0.1USN-6422-1

jami-daemonUbuntu

Fixed in:20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1USN-6422-1

Fixed in:20230206.0~ds1-5ubuntu0.1USN-6422-1

libpj2Ubuntu

Fixed in:2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1USN-8122-1

Fixed in:2.7.2~dfsg-1ubuntu0.1~esm1USN-8122-1

libpjmedia2Ubuntu

Fixed in:2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1USN-8122-1

Fixed in:2.7.2~dfsg-1ubuntu0.1~esm1USN-8122-1

libpjnath2Ubuntu

Fixed in:2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1USN-8122-1

Fixed in:2.7.2~dfsg-1ubuntu0.1~esm1USN-8122-1

libpjsip2Ubuntu

Fixed in:2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1USN-8122-1

Fixed in:2.7.2~dfsg-1ubuntu0.1~esm1USN-8122-1

libpjsua2Ubuntu

Fixed in:2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1USN-8122-1

Fixed in:2.7.2~dfsg-1ubuntu0.1~esm1USN-8122-1

pjprojectUbuntu

Fixed in:2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1USN-8122-1

Fixed in:2.7.2~dfsg-1ubuntu0.1~esm1USN-8122-1

python-pjprojectUbuntu

Fixed in:2.7.2~dfsg-1ubuntu0.1~esm1USN-8122-1

ringUbuntu

Fixed in:20180228.1.503da2b~ds1-1ubuntu0.1~esm1USN-6422-1

Fixed in:20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1USN-6422-1

Fixed in:20230206.0~ds1-5ubuntu0.1USN-6422-1

ring-daemonUbuntu

Fixed in:20180228.1.503da2b~ds1-1ubuntu0.1~esm1USN-6422-1

Fixed in:20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1USN-6422-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

2.34%probability of exploitation in 30 days

82ndpercentile

Elevated risk: more likely to be exploited than 82% of all known CVEs.

References

Patch1

github.com

Third-Party Advisory3

Other references2

Related Vulnerabilities

Other CWE-121 (Stack-based Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2009-0927	High	8.8	97%	KEV	Fix
CVE-2020-10924	High	8.8	87%	-	-
CVE-2022-20705	Critical	10.0	80%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-04.