Out-of-bounds Read in Squid-Cache Squid
CVE-2021-28116
Squid through 4.14 and 5.x through 5.0.5, in some configurations, allows information disclosure because of an out-of-bounds read in WCCP protocol data. This can be leveraged as part of a chain for remote code execution as nobody.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.129 (96.2th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.130 · newest: 0.129 · change: -0.001
Affected products
- Squid-Cache Squid
- Debian Linux — versions 10.0, 11.0
- Fedoraproject Fedora — versions 33, 34
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.squid-cache.org/Versions/ (Product, Vendor Advisory)
- www.zerodayinitiative.com/advisories/ZDI-21-157/ (VDB Entry, Third Party Advisory)
- github.com/squid-cache/squid/security/advisories/GHSA-rgf3-9v3p-qp82 (Broken Link)
- security.gentoo.org/glsa/202105-14 (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)
- www.openwall.com/lists/oss-security/2021/10/04/1 (mailing-list, Mailing List, Third Party Advisory)
- www.debian.org/security/2022/dsa-5171 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-28116?
- CVE-2021-28116 is a low-severity vulnerability in Squid-Cache Squid, classified under Out-of-bounds Read. CVSS score: 3.7/10. Published 2021-03-09.
- How severe is CVE-2021-28116?
- Low severity. CVSS v3 base score is 3.7 out of 10.
- Is CVE-2021-28116 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.