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Vulnerability record · CVE-2021-43303 · published 16 February 2022

CVE-2021-43303: Teluu pjsip classic buffer overflow vulnerability

Teluu · Pjsip

Buffer overflow in PJSUA API when calling pjsua_call_dump. An attacker-controlled 'buffer' argument may cause a buffer overflow, since supplying an output buffer smaller than 128 characters may overflow the output buffer, regardless of the 'maxlen' argument supplied

9.8 CVSS 3.1 Critical EPSS 2.4% · top 16.9% CWE-120 · Classic buffer overflow
9.8CVSS 3.1 base score, v2 7.5
2.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
11References
17 Jun 2026Last modified by NVD

Description

Buffer overflow in PJSUA API when calling pjsua_call_dump. An attacker-controlled 'buffer' argument may cause a buffer overflow, since supplying an output buffer smaller than 128 characters may overflow the output buffer, regardless of the 'maxlen' argument supplied

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/pjsip/pjproject/security/advisories/GHSA-qcvw-h34v-c7r9 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00035.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2023/08/msg00038.html
https://www.debian.org/security/2022/dsa-5285 Third Party Advisory
https://github.com/pjsip/pjproject/security/advisories/GHSA-qcvw-h34v-c7r9 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00035.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2023/08/msg00038.html
https://lists.debian.org/debian-lts-announce/2024/09/msg00030.html
https://www.debian.org/security/2022/dsa-5285 Third Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-43303), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.