Vulnerability in Squid-Cache Squid
CVE-2020-15049
An issue was discovered in http/ContentLengthInterpreter.cc in Squid before 4.12 and 5.x before 5.0.3. A Request Smuggling and Poisoning attack can succeed against the HTTP cache. The client sends an HTTP request with a Content-Length header containing "+\ "-" or an uncommon shell whitespace character prefix to the length field-value.
Vulnerability class: HTTP Request Smuggling
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.057 (92.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 92.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.057 · newest: 0.057 · change: 0.000
Affected products
- Squid-Cache Squid — versions 2.7
- Fedoraproject Fedora — versions 31
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.squid-cache.org/Versions/v4/changesets/squid-4-ea12a34d338b962707d5078d6d1f… (Patch, Vendor Advisory)
- www.squid-cache.org/Versions/v5/changesets/squid-5-485c9a7bb1bba88754e07ad00946… (Patch, Vendor Advisory)
- github.com/squid-cache/squid/security/advisories/GHSA-qf3v-rc95-96j5 (Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- www.debian.org/security/2020/dsa-4732 (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2020-09/msg00012.html (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2020-09/msg00017.html (vendor-advisory)
- usn.ubuntu.com/4551-1/ (vendor-advisory)
- lists.debian.org/debian-lts-announce/2020/10/msg00005.html (mailing-list)
- security.netapp.com/advisory/ntap-20210312-0001/
Frequently asked questions
- What is CVE-2020-15049?
- CVE-2020-15049 is a critical-severity vulnerability in Squid-Cache Squid, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 9.9/10. Published 2020-06-30.
- How severe is CVE-2020-15049?
- Critical severity. CVSS v3 base score is 9.9 out of 10.
- Is CVE-2020-15049 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.