# CVE-2021-46784: libecap: Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects. Secu... CVE-2021-46784 is fixed in 9 products on 1 platform, first by squid 3.5.27-1ubuntu1.13, released December 30, 2021. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2021-46784 - Priority: High - CVSS: 7.5 (important) - EPSS: 0.0513 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Dec 30, 2021 ## Description Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects. Security Fix(es): * squid: DoS when processing gopher server responses (CVE-2021-46784) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libecap RHEL 8 | 0:1.0.1-2.module+el8.1.0+4044+36416a77 | [RHSA-2022:5526](https://patchblox.com/security/data/fix/linux/rhsa-2022-5526.md) | Jul 7, 2022 | | Linux | libecap almalinux 8 | 1.0.1-2.module_el8.6.0+2741+01592ae8 | [ALSA-2022:5526](https://patchblox.com/security/data/fix/linux/alsa-2022-5526.md) | Jul 7, 2022 | | Linux | libecap ol 8 | 0:1.0.1-2.module+el8.3.0+7819+eb7d4ef6 | [ELSA-2022-5526](https://patchblox.com/security/data/fix/linux/elsa-2022-5526.md) | Jul 8, 2022 | | Linux | libecap rocky 8 | 0:1.0.1-2.module+el8.4.0+404+316a0dc5 | [RLSA-2022:5526](https://patchblox.com/security/data/fix/linux/rlsa-2022-5526.md) | Jul 7, 2022 | | Linux | libecap-devel RHEL 8 | 0:1.0.1-2.module+el8.1.0+4044+36416a77 | [RHSA-2022:5526](https://patchblox.com/security/data/fix/linux/rhsa-2022-5526.md) | Jul 7, 2022 | | Linux | libecap-devel almalinux 8 | 1.0.1-2.module_el8.6.0+2741+01592ae8 | [ALSA-2022:5526](https://patchblox.com/security/data/fix/linux/alsa-2022-5526.md) | Jul 7, 2022 | | Linux | libecap-devel ol 8 | 0:1.0.1-2.module+el8.3.0+7819+eb7d4ef6 | [ELSA-2022-5526](https://patchblox.com/security/data/fix/linux/elsa-2022-5526.md) | Jul 8, 2022 | | Linux | squid Debian 12.15 (bookworm) | 5.6-1 | [DEBIAN-CVE-2021-46784](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46784.md) | Jul 17, 2022 | | Linux | squid Debian 13.5 (trixie) | 5.6-1 | [DEBIAN-CVE-2021-46784](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46784.md) | Jul 17, 2022 | | Linux | squid Debian 14 | 5.6-1 | [DEBIAN-CVE-2021-46784](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46784.md) | Jul 17, 2022 | | Linux | squid RHEL 8 | 7:4.15-3.module+el8.6.0+15801+8fa20c64.1 | [RHSA-2022:5526](https://patchblox.com/security/data/fix/linux/rhsa-2022-5526.md) | Jul 7, 2022 | | Linux | squid RHEL 9 | 7:5.2-1.el9_0.1 | [RHSA-2022:5527](https://patchblox.com/security/data/fix/linux/rhsa-2022-5527.md) | Jul 7, 2022 | | Linux | squid Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.13 | [squid 3.5.27-1ubuntu1.13](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squid-3.5.27-1ubuntu1.13.md) | Dec 30, 2021 | | Linux | squid Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.6 | [squid 4.10-1ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squid-4.10-1ubuntu1.6.md) | Dec 30, 2021 | | Linux | squid Ubuntu 22.04.1 LTS (jammy) | 5.2-1ubuntu4.1 | [squid 5.2-1ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squid-5.2-1ubuntu4.1.md) | Dec 30, 2021 | | Linux | squid Ubuntu 24.10 (oracular) | 5.2-1ubuntu5 | [squid 5.2-1ubuntu5](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-squid-5.2-1ubuntu5.md) | Jan 16, 2026 | | Linux | squid Ubuntu 25.04 (plucky) | 5.2-1ubuntu5 | [squid 5.2-1ubuntu5](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-squid-5.2-1ubuntu5.md) | Jan 16, 2026 | | Linux | squid almalinux 8 | 7:4.15-3.module_el8.6.0+3010+383bc947.1 | [ALSA-2022:5526](https://patchblox.com/security/data/fix/linux/alsa-2022-5526.md) | Jul 7, 2022 | | Linux | squid almalinux 9 | 7:5.2-1.el9_0.1 | [ALSA-2022:5527](https://patchblox.com/security/data/fix/linux/alsa-2022-5527.md) | Jul 7, 2022 | | Linux | squid ol 8 | 7:4.15-3.module+el8.6.0+20699+8fa0a254.1 | [ELSA-2022-5526](https://patchblox.com/security/data/fix/linux/elsa-2022-5526.md) | Jul 8, 2022 | | Linux | squid ol 9 | 7:5.2-1.el9_0.1 | [ELSA-2022-5527](https://patchblox.com/security/data/fix/linux/elsa-2022-5527.md) | Jul 7, 2022 | | Linux | squid rocky 8 | 7:4.15-3.module+el8.6.0+1044+67ab5d0a.2 | [RLSA-2022:5526](https://patchblox.com/security/data/fix/linux/rlsa-2022-5526.md) | Jul 7, 2022 | | Linux | squid-cgi Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.13 | [squid-cgi 3.5.27-1ubuntu1.13](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squid-cgi-3.5.27-1ubuntu1.13.md) | Dec 30, 2021 | | Linux | squid-cgi Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.6 | [squid-cgi 4.10-1ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squid-cgi-4.10-1ubuntu1.6.md) | Dec 30, 2021 | | Linux | squid-cgi Ubuntu 22.04.1 LTS (jammy) | 5.2-1ubuntu4.1 | [squid-cgi 5.2-1ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squid-cgi-5.2-1ubuntu4.1.md) | Dec 30, 2021 | | Linux | squid-cgi Ubuntu 24.10 (oracular) | 5.2-1ubuntu5 | [squid-cgi 5.2-1ubuntu5](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-squid-cgi-5.2-1ubuntu5.md) | Jan 16, 2026 | | Linux | squid-cgi Ubuntu 25.04 (plucky) | 5.2-1ubuntu5 | [squid-cgi 5.2-1ubuntu5](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-squid-cgi-5.2-1ubuntu5.md) | Jan 16, 2026 | | Linux | squid-common Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.13 | [squid-common 3.5.27-1ubuntu1.13](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squid-common-3.5.27-1ubuntu1.13.md) | Dec 30, 2021 | | Linux | squid-common Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.6 | [squid-common 4.10-1ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squid-common-4.10-1ubuntu1.6.md) | Dec 30, 2021 | | Linux | squid-common Ubuntu 22.04.1 LTS (jammy) | 5.2-1ubuntu4.1 | [squid-common 5.2-1ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squid-common-5.2-1ubuntu4.1.md) | Dec 30, 2021 | | Linux | squid-common Ubuntu 24.10 (oracular) | 5.2-1ubuntu5 | [squid-common 5.2-1ubuntu5](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-squid-common-5.2-1ubuntu5.md) | Jan 16, 2026 | | Linux | squid-common Ubuntu 25.04 (plucky) | 5.2-1ubuntu5 | [squid-common 5.2-1ubuntu5](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-squid-common-5.2-1ubuntu5.md) | Jan 16, 2026 | | Linux | squid-openssl Ubuntu 22.04.1 LTS (jammy) | 5.2-1ubuntu4.1 | [squid-openssl 5.2-1ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squid-openssl-5.2-1ubuntu4.1.md) | Dec 30, 2021 | | Linux | squid-openssl Ubuntu 24.10 (oracular) | 5.2-1ubuntu5 | [squid-openssl 5.2-1ubuntu5](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-squid-openssl-5.2-1ubuntu5.md) | Jan 16, 2026 | | Linux | squid-openssl Ubuntu 25.04 (plucky) | 5.2-1ubuntu5 | [squid-openssl 5.2-1ubuntu5](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-squid-openssl-5.2-1ubuntu5.md) | Jan 16, 2026 | | Linux | squid-purge Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.13 | [squid-purge 3.5.27-1ubuntu1.13](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squid-purge-3.5.27-1ubuntu1.13.md) | Dec 30, 2021 | | Linux | squid-purge Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.6 | [squid-purge 4.10-1ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squid-purge-4.10-1ubuntu1.6.md) | Dec 30, 2021 | | Linux | squid-purge Ubuntu 22.04.1 LTS (jammy) | 5.2-1ubuntu4.1 | [squid-purge 5.2-1ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squid-purge-5.2-1ubuntu4.1.md) | Dec 30, 2021 | | Linux | squid-purge Ubuntu 24.10 (oracular) | 5.2-1ubuntu5 | [squid-purge 5.2-1ubuntu5](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-squid-purge-5.2-1ubuntu5.md) | Jan 16, 2026 | | Linux | squid-purge Ubuntu 25.04 (plucky) | 5.2-1ubuntu5 | [squid-purge 5.2-1ubuntu5](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-squid-purge-5.2-1ubuntu5.md) | Jan 16, 2026 | | Linux | squid3 Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.13 | [squid3 3.5.27-1ubuntu1.13](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squid3-3.5.27-1ubuntu1.13.md) | Dec 30, 2021 | | Linux | squidclient Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.13 | [squidclient 3.5.27-1ubuntu1.13](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squidclient-3.5.27-1ubuntu1.13.md) | Dec 30, 2021 | | Linux | squidclient Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.6 | [squidclient 4.10-1ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squidclient-4.10-1ubuntu1.6.md) | Dec 30, 2021 | | Linux | squidclient Ubuntu 22.04.1 LTS (jammy) | 5.2-1ubuntu4.1 | [squidclient 5.2-1ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squidclient-5.2-1ubuntu4.1.md) | Dec 30, 2021 | | Linux | squidclient Ubuntu 24.10 (oracular) | 5.2-1ubuntu5 | [squidclient 5.2-1ubuntu5](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-squidclient-5.2-1ubuntu5.md) | Jan 16, 2026 | | Linux | squidclient Ubuntu 25.04 (plucky) | 5.2-1ubuntu5 | [squidclient 5.2-1ubuntu5](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-squidclient-5.2-1ubuntu5.md) | Jan 16, 2026 | --- Data as of 2026-11-08T19:12:23Z UTC. 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