Vulnerability in Squid-Cache Squid
CVE-2021-41611
An issue was discovered in Squid 5.0.6 through 5.1.x before 5.2. When validating an origin server or peer certificate, Squid may incorrectly classify certain certificates as trusted. This problem allows a remote server to obtain security trust well improperly. This indication of trust may be passed along to clients, allowing access to unsafe or hijacked services.
Vulnerability class: Improper Certificate Validation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.029 (86.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 86.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.029 · newest: 0.029 · change: 0.000
Affected products
- Squid-Cache Squid
- Fedoraproject Fedora — versions 35
Weakness classification (CWE)
References
- www.squid-cache.org/Versions/v6/changesets/squid-6-43d6b5c81b88ec2256b430c69a87… (Vendor Advisory)
- github.com/squid-cache/squid/security/advisories/GHSA-47m4-g3mv-9q5r (Patch, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- www.openwall.com/lists/oss-security/2021/12/23/2 (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-41611?
- CVE-2021-41611 is a high-severity vulnerability in Squid-Cache Squid, classified under Improper Certificate Validation. CVSS score: 7.5/10. Published 2021-10-18.
- How severe is CVE-2021-41611?
- High severity. CVSS v3 base score is 7.5 out of 10.