# CVE-2021-28652: libecap: Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects. The... CVE-2021-28652 is fixed in 8 products on 1 platform, first by squid 3.5.27-1ubuntu1.11, released May 28, 2021. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2021-28652 - Priority: High - CVSS: 7.4 (Moderate) - EPSS: 0.0434 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: May 27, 2021 ## Description Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects. The following packages have been upgraded to a later upstream version: squid (4.15). (BZ#1964384) Security Fix(es): * squid: denial of service in URN processing (CVE-2021-28651) * squid: denial of service issue in Cache Manager (CVE-2021-28652) * squid: denial of service in HTTP response processing (CVE-2021-28662) * squid: improper input validation in HTTP Range header (CVE-2021-31806) * squid: incorrect memory management in HTTP Range header (CVE-2021-31807) * squid: integer overflow in HTTP Range header (CVE-2021-31808) * squid: denial of service in HTTP response processing (CVE-2021-33620) 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. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.5 Release Notes linked from 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-2021:4292](https://patchblox.com/security/data/fix/linux/rhsa-2021-4292.md) | Nov 9, 2021 | | Linux | libecap almalinux 8 | 1.0.1-2.module_el8.6.0+2741+01592ae8 | [ALSA-2021:4292](https://patchblox.com/security/data/fix/linux/alsa-2021-4292.md) | Nov 9, 2021 | | Linux | libecap ol 8 | 0:1.0.1-2.module+el8.3.0+7819+eb7d4ef6 | [ELSA-2021-4292](https://patchblox.com/security/data/fix/linux/elsa-2021-4292.md) | Nov 16, 2021 | | Linux | libecap rocky 8 | 0:1.0.1-2.module+el8.4.0+404+316a0dc5 | [RLSA-2021:4292](https://patchblox.com/security/data/fix/linux/rlsa-2021-4292.md) | Nov 9, 2021 | | Linux | libecap-devel RHEL 8 | 0:1.0.1-2.module+el8.1.0+4044+36416a77 | [RHSA-2021:4292](https://patchblox.com/security/data/fix/linux/rhsa-2021-4292.md) | Nov 9, 2021 | | Linux | libecap-devel almalinux 8 | 1.0.1-2.module_el8.6.0+2741+01592ae8 | [ALSA-2021:4292](https://patchblox.com/security/data/fix/linux/alsa-2021-4292.md) | Nov 9, 2021 | | Linux | libecap-devel ol 8 | 0:1.0.1-2.module+el8.3.0+7819+eb7d4ef6 | [ELSA-2021-4292](https://patchblox.com/security/data/fix/linux/elsa-2021-4292.md) | Nov 16, 2021 | | Linux | squid RHEL 8 | 7:4.15-1.module+el8.5.0+11469+24c223d9 | [RHSA-2021:4292](https://patchblox.com/security/data/fix/linux/rhsa-2021-4292.md) | Nov 9, 2021 | | Linux | squid Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.11 | [squid 3.5.27-1ubuntu1.11](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squid-3.5.27-1ubuntu1.11.md) | May 28, 2021 | | Linux | squid Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.4 | [squid 4.10-1ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squid-4.10-1ubuntu1.4.md) | May 28, 2021 | | Linux | squid almalinux 8 | 7:4.15-3.module_el8.6.0+3010+383bc947.1 | [ALSA-2021:4292](https://patchblox.com/security/data/fix/linux/alsa-2021-4292.md) | Nov 9, 2021 | | Linux | squid ol 8 | 7:4.15-1.module+el8.5.0+20327+24c223d9 | [ELSA-2021-4292](https://patchblox.com/security/data/fix/linux/elsa-2021-4292.md) | Nov 16, 2021 | | Linux | squid rocky 8 | 7:4.15-1.module+el8.5.0+705+218dec94 | [RLSA-2021:4292](https://patchblox.com/security/data/fix/linux/rlsa-2021-4292.md) | Nov 9, 2021 | | Linux | squid-cgi Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.11 | [squid-cgi 3.5.27-1ubuntu1.11](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squid-cgi-3.5.27-1ubuntu1.11.md) | May 28, 2021 | | Linux | squid-cgi Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.4 | [squid-cgi 4.10-1ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squid-cgi-4.10-1ubuntu1.4.md) | May 28, 2021 | | Linux | squid-common Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.11 | [squid-common 3.5.27-1ubuntu1.11](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squid-common-3.5.27-1ubuntu1.11.md) | May 28, 2021 | | Linux | squid-common Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.4 | [squid-common 4.10-1ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squid-common-4.10-1ubuntu1.4.md) | May 28, 2021 | | Linux | squid-purge Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.11 | [squid-purge 3.5.27-1ubuntu1.11](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squid-purge-3.5.27-1ubuntu1.11.md) | May 28, 2021 | | Linux | squid-purge Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.4 | [squid-purge 4.10-1ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squid-purge-4.10-1ubuntu1.4.md) | May 28, 2021 | | Linux | squid3 Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.11 | [squid3 3.5.27-1ubuntu1.11](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squid3-3.5.27-1ubuntu1.11.md) | May 28, 2021 | | Linux | squidclient Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.11 | [squidclient 3.5.27-1ubuntu1.11](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squidclient-3.5.27-1ubuntu1.11.md) | May 28, 2021 | | Linux | squidclient Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.4 | [squidclient 4.10-1ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squidclient-4.10-1ubuntu1.4.md) | May 28, 2021 | --- Data as of 2026-11-08T00:53:09Z UTC. 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