CVE-2021-46784
In Squid 3.x through 3.5.28, 4.x through 4.17, and 5.x before 5.6, due to improper buffer management, a Denial of Service can occur when processing long Gopher server responses.
02 Description
In Squid 3.x through 3.5.28, 4.x through 4.17, and 5.x before 5.6, due to improper buffer management, a Denial of Service can occur when processing long Gopher server responses.
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
- 5.12% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 92.1% of scored records. A rank, not a probability.
- NVD base score
- 6.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Important. 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
- 2022-07-17 00:00Z4 YR AGO
- Last updated
- 2024-08-04 05:17Z2 YR AGO
- Reserved
- 2022-04-21
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-617Reachable AssertionBase
- Data version
- 5.1
- Document digest
- 4290fef55afc72f819bbecd414ac3f79e73fa353946abc05bfaff0d4b285105b
05 Affected products
06 References
- github.comhttps://github.com/squid-cache/squid/commit/5e2ea2b13bd98f53e29964ca26bb0d602a8a12b9
- www.squid-cache.orghttp://www.squid-cache.org/Versions/v4/changesets/SQUID-2021_7.patch
- www.squid-cache.orghttp://www.squid-cache.org/Versions/v5/changesets/SQUID-2021_7.patch
- github.comhttps://github.com/squid-cache/squid/security/advisories/GHSA-f5cp-6rh3-284w
- security-tracker.debian.orghttps://security-tracker.debian.org/tracker/CVE-2021-46784
- security.netapp.comhttps://security.netapp.com/advisory/ntap-20221223-0007/
- www.openwall.com[oss-security] 20231013 Re: Squid Caching Proxy Security Audit: 55 Vulnerabilities, 35 0days.http://www.openwall.com/lists/oss-security/2023/10/13/1
- www.openwall.com[oss-security] 20231013 Re: Squid Caching Proxy Security Audit: 55 Vulnerabilities, 35 0days.http://www.openwall.com/lists/oss-security/2023/10/13/10
- www.openwall.com[oss-security] 20231021 Re: Squid Caching Proxy Security Audit: 55 Vulnerabilities, 35 0days.http://www.openwall.com/lists/oss-security/2023/10/21/1
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+3010+383bc947.1
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 9
- squid Fixed in 7:5.2-1.el9_0.1
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. 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+3010+383bc947.1
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.
CloudLinux 9
- squid Fixed in 7:5.2-1.el9_0.1
Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 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 5.6-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- squid Fixed in 5.6-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- squid Fixed in 5.6-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- squid3 Fixed in 3.5.27-1ubuntu1.13
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 4.10-1ubuntu1.6
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 5.2-1ubuntu4.1
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.