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CVE-2021-46784In 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…
- 6.5MediumCVSS base score
- 5.1%Exploitation in 30 daysEPSS · top 7.5% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By mitre
- 3 months later
· 3 months later
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 5.1% · top 7.5% of all CVEs (12 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.
Affected products
n/a
- affected n/a
References
References9
- https://github.com/squid-cache/squid/commit/5e2ea2b13bd98f53e29964ca26bb0d602a8a12b9 (opens in a new tab)x_transferred
- http://www.squid-cache.org/Versions/v4/changesets/SQUID-2021_7.patch (opens in a new tab)x_transferred
- http://www.squid-cache.org/Versions/v5/changesets/SQUID-2021_7.patch (opens in a new tab)x_transferred
- https://github.com/squid-cache/squid/security/advisories/GHSA-f5cp-6rh3-284w (opens in a new tab)x_transferred
- https://security-tracker.debian.org/tracker/CVE-2021-46784 (opens in a new tab)x_transferred
- https://security.netapp.com/advisory/ntap-20221223-0007/ (opens in a new tab)x_transferred
- [oss-security] 20231013 Re: Squid Caching Proxy Security Audit: 55 Vulnerabilities, 35 0days. (opens in a new tab)mailing-listx_transferred
- [oss-security] 20231013 Re: Squid Caching Proxy Security Audit: 55 Vulnerabilities, 35 0days. (opens in a new tab)mailing-listx_transferred
- [oss-security] 20231021 Re: Squid Caching Proxy Security Audit: 55 Vulnerabilities, 35 0days. (opens in a new tab)mailing-listx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-33440 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-46784)Record last updated .