Vulnerability in Squid-Cache Squid
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 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.043 (90.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 90.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.043 · newest: 0.043 · change: 0.000
Affected products
- Squid-Cache Squid
- Debian Linux — versions 9.0, 10.0
- Fedoraproject Fedora — versions 33, 34
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugs.squid-cache.org/show_bug.cgi (Exploit, Issue Tracking, Vendor Advisory)
- github.com/squid-cache/squid/security/advisories/GHSA-m47m-9hvw-7447 (Patch, Third Party Advisory)
- www.debian.org/security/2021/dsa-4924 (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.debian.org/debian-lts-announce/2021/06/msg00014.html (mailing-list, Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2023/10/11/3 (mailing-list, Mailing List, Third Party Advisory)
- seclists.org/fulldisclosure/2023/Oct/14 (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-28652?
- CVE-2021-28652 is a medium-severity vulnerability in Squid-Cache Squid, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 4.9/10. Published 2021-05-27.
- How severe is CVE-2021-28652?
- Medium severity. CVSS v3 base score is 4.9 out of 10.
- Is CVE-2021-28652 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.