# CVE-2021-43300: ring: Stack overflow in PJSUA API when calling pjsua_recorder_create CVE-2021-43300 is fixed in 18 products on 1 platform, first by DEBIAN-CVE-2021-43300, released February 16, 2022. It is not reported as exploited. Patch Radar priority: Urgent. - Web page: https://patchblox.com/security/cve/CVE-2021-43300 - Priority: Urgent - CVSS: 9.8 (critical) - EPSS: 0.0236 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Feb 16, 2022 ## 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | asterisk Debian 14 | 1:18.11.1~dfsg+~cs6.10.40431413-1 | [DEBIAN-CVE-2021-43300](https://patchblox.com/security/data/fix/linux/debian-cve-2021-43300.md) | Feb 16, 2022 | | Linux | jami Ubuntu 20.04 LTS (focal) | 20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1 | [jami 20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-jami-20190215.1.f152c98-ds1-1-deb10u2build0.20.04.1.md) | Mar 14, 2023 | | Linux | jami-daemon Ubuntu 20.04 LTS (focal) | 20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1 | [jami-daemon 20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-jami-daemon-20190215.1.f152c98-ds1-1-deb10u2build0.20.04.1.md) | Mar 14, 2023 | | Linux | libpj2 Ubuntu 18.04.6 LTS (bionic) | 2.7.2~dfsg-1ubuntu0.1~esm1 | [libpj2 2.7.2~dfsg-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libpj2-2.7.2-dfsg-1ubuntu0.1-esm1.md) | Feb 11, 2026 | | Linux | libpjlib-util2 Ubuntu 18.04.6 LTS (bionic) | 2.7.2~dfsg-1ubuntu0.1~esm1 | [libpjlib-util2 2.7.2~dfsg-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libpjlib-util2-2.7.2-dfsg-1ubuntu0.1-esm1.md) | Feb 11, 2026 | | Linux | libpjmedia-audiodev2 Ubuntu 18.04.6 LTS (bionic) | 2.7.2~dfsg-1ubuntu0.1~esm1 | [libpjmedia-audiodev2 2.7.2~dfsg-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libpjmedia-audiodev2-2.7.2-dfsg-1ubuntu0.1-esm1.md) | Feb 11, 2026 | | Linux | libpjmedia-codec2 Ubuntu 18.04.6 LTS (bionic) | 2.7.2~dfsg-1ubuntu0.1~esm1 | [libpjmedia-codec2 2.7.2~dfsg-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libpjmedia-codec2-2.7.2-dfsg-1ubuntu0.1-esm1.md) | Feb 11, 2026 | | Linux | libpjmedia-videodev2 Ubuntu 18.04.6 LTS (bionic) | 2.7.2~dfsg-1ubuntu0.1~esm1 | [libpjmedia-videodev2 2.7.2~dfsg-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libpjmedia-videodev2-2.7.2-dfsg-1ubuntu0.1-esm1.md) | Feb 11, 2026 | | Linux | libpjmedia2 Ubuntu 18.04.6 LTS (bionic) | 2.7.2~dfsg-1ubuntu0.1~esm1 | [libpjmedia2 2.7.2~dfsg-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libpjmedia2-2.7.2-dfsg-1ubuntu0.1-esm1.md) | Feb 11, 2026 | | Linux | libpjnath2 Ubuntu 18.04.6 LTS (bionic) | 2.7.2~dfsg-1ubuntu0.1~esm1 | [libpjnath2 2.7.2~dfsg-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libpjnath2-2.7.2-dfsg-1ubuntu0.1-esm1.md) | Feb 11, 2026 | | Linux | libpjsip-simple2 Ubuntu 18.04.6 LTS (bionic) | 2.7.2~dfsg-1ubuntu0.1~esm1 | [libpjsip-simple2 2.7.2~dfsg-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libpjsip-simple2-2.7.2-dfsg-1ubuntu0.1-esm1.md) | Feb 11, 2026 | | Linux | libpjsip-ua2 Ubuntu 18.04.6 LTS (bionic) | 2.7.2~dfsg-1ubuntu0.1~esm1 | [libpjsip-ua2 2.7.2~dfsg-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libpjsip-ua2-2.7.2-dfsg-1ubuntu0.1-esm1.md) | Feb 11, 2026 | | Linux | libpjsip2 Ubuntu 18.04.6 LTS (bionic) | 2.7.2~dfsg-1ubuntu0.1~esm1 | [libpjsip2 2.7.2~dfsg-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libpjsip2-2.7.2-dfsg-1ubuntu0.1-esm1.md) | Feb 11, 2026 | | Linux | libpjsua2 Ubuntu 18.04.6 LTS (bionic) | 2.7.2~dfsg-1ubuntu0.1~esm1 | [libpjsua2 2.7.2~dfsg-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libpjsua2-2.7.2-dfsg-1ubuntu0.1-esm1.md) | Feb 11, 2026 | | Linux | libpjsua2-2v5 Ubuntu 18.04.6 LTS (bionic) | 2.7.2~dfsg-1ubuntu0.1~esm1 | [libpjsua2-2v5 2.7.2~dfsg-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libpjsua2-2v5-2.7.2-dfsg-1ubuntu0.1-esm1.md) | Feb 11, 2026 | | Linux | python-pjproject Ubuntu 18.04.6 LTS (bionic) | 2.7.2~dfsg-1ubuntu0.1~esm1 | [python-pjproject 2.7.2~dfsg-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-pjproject-2.7.2-dfsg-1ubuntu0.1-esm1.md) | Feb 11, 2026 | | Linux | ring Debian 12.15 (bookworm) | 20230206.0~ds1-1 | [DEBIAN-CVE-2021-43300](https://patchblox.com/security/data/fix/linux/debian-cve-2021-43300.md) | Feb 16, 2022 | | Linux | ring Ubuntu 18.04.6 LTS (bionic) | 20180228.1.503da2b~ds1-1ubuntu0.1~esm1 | [ring 20180228.1.503da2b~ds1-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-ring-20180228.1.503da2b-ds1-1ubuntu0.1-esm1.md) | Mar 14, 2023 | | Linux | ring Ubuntu 20.04 LTS (focal) | 20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1 | [ring 20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-ring-20190215.1.f152c98-ds1-1-deb10u2build0.20.04.1.md) | Mar 14, 2023 | | Linux | ring-daemon Ubuntu 18.04.6 LTS (bionic) | 20180228.1.503da2b~ds1-1ubuntu0.1~esm1 | [ring-daemon 20180228.1.503da2b~ds1-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-ring-daemon-20180228.1.503da2b-ds1-1ubuntu0.1-esm1.md) | Mar 14, 2023 | | Linux | ring-daemon Ubuntu 20.04 LTS (focal) | 20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1 | [ring-daemon 20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-ring-daemon-20190215.1.f152c98-ds1-1-deb10u2build0.20.04.1.md) | Mar 14, 2023 | --- Data as of 2026-11-08T06:59:42Z UTC. 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