CVE-2021-28116
Squid through 4.14 and 5.x through 5.0.5, in some configurations, allows information disclosure because of an out-of-bounds read in WCCP protocol data. This can be leveraged as part of a chain for
02 Description
Squid through 4.14 and 5.x through 5.0.5, in some configurations, allows information disclosure because of an out-of-bounds read in WCCP protocol data. This can be leveraged as part of a chain for
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 12.94% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 96.0% of scored records. A rank, not a probability.
- NVD base score
- 5.3 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2021-03-09 21:44Z5 YR AGO
- Last updated
- 2024-08-03 21:33Z2 YR AGO
- Reserved
- 2021-03-09
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- Low (CVSS 3.7)
- CNA CVSS vector
- CVSS:3.1/AC:H/AV:N/A:N/C:L/I:N/PR:N/S:U/UI:N
- Weaknesses
- CWE-125Out-of-bounds ReadBase
- Data version
- 5.1
- Document digest
- 45415ae9892b60791d7cbdb14bd0c4eabf526f02cf9571fb969c483206f01f6f
05 Affected products
06 References
- www.squid-cache.orghttp://www.squid-cache.org/Versions/
- www.zerodayinitiative.comhttps://www.zerodayinitiative.com/advisories/ZDI-21-157/
- github.comhttps://github.com/squid-cache/squid/security/advisories/GHSA-rgf3-9v3p-qp82
- security.gentoo.orgGLSA-202105-14https://security.gentoo.org/glsa/202105-14
- lists.fedoraproject.orgFEDORA-2021-c0bec55ec7https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF/
- lists.fedoraproject.orgFEDORA-2021-24af72ff2chttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T4EPIWUZDJAXADDHVOPKRBTQHPBR6H66/
- www.openwall.com[oss-security] 20211004 CVE-2021-28116 / ZDI-CAN-11610 / SQUID-2020:12 Out-Of-Bounds memory access in WCCPv2http://www.openwall.com/lists/oss-security/2021/10/04/1
- www.debian.orgDSA-5171https://www.debian.org/security/2022/dsa-5171
07 Fixed in
AlmaLinux 8
- libecap Fixed in 1.0.1-2.module_el8.6.0+2741+01592ae8
- libecap-devel Fixed in 1.0.1-2.module_el8.6.0+2741+01592ae8
- squid Fixed in 7:4.15-3.module_el8.6.0+2741+01592ae8
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Arch Linux
- squid Fixed in 5.2-1
Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.
CloudLinux 8
- libecap Fixed in 1.0.1-2.module_el8.6.0+2741+01592ae8
- libecap-devel Fixed in 1.0.1-2.module_el8.6.0+2741+01592ae8
- squid Fixed in 7:4.15-3.module_el8.6.0+2741+01592ae8
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- squid Fixed in 5.2-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- squid Fixed in 5.2-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- squid Fixed in 5.2-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- squid3 Fixed in 3.5.27-1ubuntu1.12
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- squid Fixed in 4.10-1ubuntu1.5
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- squid Fixed in 4.13-10ubuntu5
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- squid3 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.