Vulnerability in Puma
CVE-2020-11076
In Puma (RubyGem) before 4.3.4 and 3.12.5, an attacker could smuggle an HTTP response, by using an invalid transfer-encoding header. The problem has been fixed in Puma 3.12.5 and Puma 4.3.4.
Vulnerability class: HTTP Request Smuggling
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:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.041 (90.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 90.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.041 · newest: 0.041 · change: 0.000
Affected products
- Puma — versions < 3.12.5, >= 4.0.0, < 4.3.4
- Debian Linux — versions 9.0
- Fedoraproject Fedora — versions 33
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/puma/puma/security/advisories/GHSA-x7jg-6pwg-fx5h (Third Party Advisory)
- github.com/puma/puma/blob/master/History.md (Release Notes)
- github.com/puma/puma/commit/f24d5521295a2152c286abb0a45a1e1e2bd275bd (Patch)
- lists.opensuse.org/opensuse-security-announce/2020-07/msg00034.html (vendor-advisory, Mailing List, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-07/msg00038.html (vendor-advisory, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.debian.org/debian-lts-announce/2020/10/msg00009.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-11076?
- CVE-2020-11076 is a high-severity vulnerability in Puma, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 7.5/10. Published 2020-05-22.
- How severe is CVE-2020-11076?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2020-11076 known to be exploited?
- 8 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.