Vulnerability in Ruby-Lang Ruby
CVE-2020-25613
An issue was discovered in Ruby through 2.5.8, 2.6.x through 2.6.6, and 2.7.x through 2.7.1. WEBrick, a simple HTTP server bundled with Ruby, had not checked the transfer-encoding header value rigorously. An attacker may potentially exploit this issue to bypass a reverse proxy (which also has a poor header check), which may lead to an HTTP Request Smuggling attack.
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: 0.038 (89.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 89.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.038 · newest: 0.038 · change: 0.000
Affected products
- Ruby-Lang Ruby
- Ruby-Lang Webrick
- Fedoraproject Fedora — versions 32, 33
Weakness classification (CWE)
Public proof-of-concept exploits
References
- hackerone.com/reports/965267 (Permissions Required, Third Party Advisory)
- www.ruby-lang.org/en/news/2020/09/29/http-request-smuggling-cve-2020-25613/ (Vendor Advisory)
- github.com/ruby/webrick/commit/8946bb38b4d87549f0d99ed73c62c41933f97cc7 (Patch, 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)
- security.netapp.com/advisory/ntap-20210115-0008/ (Third Party Advisory)
- lists.debian.org/debian-lts-announce/2023/04/msg00033.html (mailing-list)
- security.gentoo.org/glsa/202401-27 (vendor-advisory)
Frequently asked questions
- What is CVE-2020-25613?
- CVE-2020-25613 is a high-severity vulnerability in Ruby-Lang Ruby, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 7.5/10. Published 2020-10-06.
- How severe is CVE-2020-25613?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2020-25613 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.