CVE-2021-28652: debian debian_linux
Vulnerability summary
CVE-2021-28652 is a medium (CVSS 4.9) vulnerability in debian debian_linux. EPSS estimates a 4.34% chance of exploitation in the next 30 days, higher than 91% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 10 · Related 6Timeline
- 27-05-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated4.9MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated4.9MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated4.9MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
4.34%
Chance of exploitation in the next 30 days
Percentile
91%
Versus all other CVEs
30-day change
0.00 pp
From 4.34% on 18-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (bugs.squid-cache.org)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Debian2 products
- squid< 4.13-10
- debian_linuxEOL9.0 | 10.0
Ubuntu2 products
- squid< 4.10-1ubuntu1.4
- squid3All versions (No fix recorded) | < 3.5.27-1ubuntu1.11
Alpine1 product
- squid≥ 1.0, < 4.15-r0 | ≥ 1.0, < 5.0.6-r0
Fedoraproject1 product
- fedoraEOL33 | 34
Squid-cache1 product
- squid≥ 1.0, < 4.15 | ≥ 5.0, < 5.0.6
5 vendors · 7 products
References
13 links
- lists.fedoraproject.org/archives/…Vendor Advisory
- lists.fedoraproject.org/archives/…Vendor Advisory