Back
CVE-2021-28652
An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to incorrect parser validation, it allows a Denial of Service…
Medium4.9EPSS 4.3%
- Published
- Updated
- Reserved
- Assigned by
- mitre
Description
An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to incorrect parser validation, it allows a Denial of Service attack against the Cache Manager API. This allows a trusted client to trigger memory leaks that. over time, lead to a Denial of Service via an unspecified short query string. This attack is limited to clients with Cache Manager API access privilege.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium4.9 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 4.3% · top 8.7% of all CVEs (6 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.9.
Weakness
Affected products
n/a
- affected n/a
References (8)
- https://bugs.squid-cache.org/show_bug.cgi?id=5106 (opens in a new tab)x_transferred
- https://github.com/squid-cache/squid/security/advisories/GHSA-m47m-9hvw-7447 (opens in a new tab)x_transferred
- DSA-4924 (opens in a new tab)vendor-advisoryx_transferred
- FEDORA-2021-c0bec55ec7 (opens in a new tab)vendor-advisoryx_transferred
- FEDORA-2021-24af72ff2c (opens in a new tab)vendor-advisoryx_transferred
- [debian-lts-announce] 20210614 [SECURITY] [DLA 2685-1] squid3 security update (opens in a new tab)mailing-listx_transferred
- [oss-security] 20231011 Squid Caching Proxy Security Audit: 55 Vulnerabilities, 35 0days. (opens in a new tab)mailing-listx_transferred
- 20231016 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)
- 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://trackcve.app/cve/CVE-2021-28652)Record last updated .