CVE-2021-28116
squid: Squid through 4.14 and 5.x through 5.0.5, in some configurations, allowsinformation disclosure because of an out-of-b...
CVE-2021-28116 is fixed in 9 products on 1 platform, first by squid 3.5.27-1ubuntu1.12, released March 9, 2021. It is not reported as exploited. Patch Radar priority: Routine.
Routine
CVSS
5.3
Medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.1295
96th percentile
Squid through 4.14 and 5.x through 5.0.5, in some configurations, allowsinformation disclosure because of an out-of-bounds read in WCCP protocoldata. This can be leveraged as part of a chain for remote code execution asnobody.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libecap · RHEL 8 | 0:1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2022:1939 | May 10, 2022 |
| libecap · almalinux 8 | 1.0.1-2.module_el8.6.0+2741+01592ae8 | ALSA-2022:1939 | May 10, 2022 |
| libecap · ol 8 | 0:1.0.1-2.module+el8.3.0+7819+eb7d4ef6 | ELSA-2022-1939 | May 17, 2022 |
| libecap · rocky 8 | 0:1.0.1-2.module+el8.4.0+404+316a0dc5 | RLSA-2022:1939 | May 10, 2022 |
| libecap-devel · RHEL 8 | 0:1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2022:1939 | May 10, 2022 |
| libecap-devel · almalinux 8 | 1.0.1-2.module_el8.6.0+2741+01592ae8 | ALSA-2022:1939 | May 10, 2022 |
| libecap-devel · ol 8 | 0:1.0.1-2.module+el8.3.0+7819+eb7d4ef6 | ELSA-2022-1939 | May 17, 2022 |
| squid · Debian 11.6 (bullseye) | 4.13-10+deb11u1 | DSA-5171-1 | Jun 27, 2022 |
| squid · RHEL 8 | 7:4.15-3.module+el8.6.0+14176+9782b8ab | RHSA-2022:1939 | May 10, 2022 |
| squid · Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.12 | squid 3.5.27-1ubuntu1.12 | Mar 9, 2021 |
| squid · Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.5 | squid 4.10-1ubuntu1.5 | Mar 9, 2021 |
| squid · Ubuntu 22.04.1 LTS (jammy) | 4.13-10ubuntu5 | squid 4.13-10ubuntu5 | Mar 9, 2021 |
| squid · Ubuntu 24.10 (oracular) | 4.13-10ubuntu5 | squid 4.13-10ubuntu5 | Jan 16, 2026 |
| squid · Ubuntu 25.04 (plucky) | 4.13-10ubuntu5 | squid 4.13-10ubuntu5 | Jan 16, 2026 |
| squid · almalinux 8 | 7:4.15-3.module_el8.6.0+2741+01592ae8 | ALSA-2022:1939 | May 10, 2022 |
| squid · ol 8 | 7:4.15-3.module+el8.6.0+20529+9782b8ab | ELSA-2022-1939 | May 17, 2022 |
| squid · rocky 8 | 7:4.15-3.module+el8.6.0+1044+67ab5d0a.2 | RLSA-2022:1939 | May 10, 2022 |
| squid-cgi · Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.12 | squid-cgi 3.5.27-1ubuntu1.12 | Mar 9, 2021 |
| squid-cgi · Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.5 | squid-cgi 4.10-1ubuntu1.5 | Mar 9, 2021 |
| squid-cgi · Ubuntu 22.04.1 LTS (jammy) | 4.13-10ubuntu5 | squid-cgi 4.13-10ubuntu5 | Mar 9, 2021 |
| squid-cgi · Ubuntu 24.10 (oracular) | 4.13-10ubuntu5 | squid-cgi 4.13-10ubuntu5 | Jan 16, 2026 |
| squid-cgi · Ubuntu 25.04 (plucky) | 4.13-10ubuntu5 | squid-cgi 4.13-10ubuntu5 | Jan 16, 2026 |
| squid-common · Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.12 | squid-common 3.5.27-1ubuntu1.12 | Mar 9, 2021 |
| squid-common · Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.5 | squid-common 4.10-1ubuntu1.5 | Mar 9, 2021 |
| squid-common · Ubuntu 22.04.1 LTS (jammy) | 4.13-10ubuntu5 | squid-common 4.13-10ubuntu5 | Mar 9, 2021 |
| squid-common · Ubuntu 24.10 (oracular) | 4.13-10ubuntu5 | squid-common 4.13-10ubuntu5 | Jan 16, 2026 |
| squid-common · Ubuntu 25.04 (plucky) | 4.13-10ubuntu5 | squid-common 4.13-10ubuntu5 | Jan 16, 2026 |
| squid-openssl · Ubuntu 22.04.1 LTS (jammy) | 4.13-10ubuntu5 | squid-openssl 4.13-10ubuntu5 | Mar 9, 2021 |
| squid-openssl · Ubuntu 24.10 (oracular) | 4.13-10ubuntu5 | squid-openssl 4.13-10ubuntu5 | Jan 16, 2026 |
| squid-openssl · Ubuntu 25.04 (plucky) | 4.13-10ubuntu5 | squid-openssl 4.13-10ubuntu5 | Jan 16, 2026 |
| squid-purge · Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.12 | squid-purge 3.5.27-1ubuntu1.12 | Mar 9, 2021 |
| squid-purge · Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.5 | squid-purge 4.10-1ubuntu1.5 | Mar 9, 2021 |
| squid-purge · Ubuntu 22.04.1 LTS (jammy) | 4.13-10ubuntu5 | squid-purge 4.13-10ubuntu5 | Mar 9, 2021 |
| squid-purge · Ubuntu 24.10 (oracular) | 4.13-10ubuntu5 | squid-purge 4.13-10ubuntu5 | Jan 16, 2026 |
| squid-purge · Ubuntu 25.04 (plucky) | 4.13-10ubuntu5 | squid-purge 4.13-10ubuntu5 | Jan 16, 2026 |
| squid3 · Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.12 | squid3 3.5.27-1ubuntu1.12 | Mar 9, 2021 |
| squidclient · Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.12 | squidclient 3.5.27-1ubuntu1.12 | Mar 9, 2021 |
| squidclient · Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.5 | squidclient 4.10-1ubuntu1.5 | Mar 9, 2021 |
| squidclient · Ubuntu 22.04.1 LTS (jammy) | 4.13-10ubuntu5 | squidclient 4.13-10ubuntu5 | Mar 9, 2021 |
| squidclient · Ubuntu 24.10 (oracular) | 4.13-10ubuntu5 | squidclient 4.13-10ubuntu5 | Jan 16, 2026 |
| squidclient · Ubuntu 25.04 (plucky) | 4.13-10ubuntu5 | squidclient 4.13-10ubuntu5 | Jan 16, 2026 |
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