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…
- Published
- Updated
- Reserved
- Assigned by
- mitre
Description
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.
Timeline
ID reserved
By mitre
- 20 days later
· 20 days later
Published
- 4 years later
· 4 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
- EPSS (exploitation in 30 days)
- 3.8% · top 9.9% of all CVEs (7 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
Affected products
n/a
- affected n/a
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- RubyGemswebrickGHSA-gwfg-cqmg-cf8f (opens in a new tab)
References (8)
- https://hackerone.com/reports/965267 (opens in a new tab)x_transferred
- https://www.ruby-lang.org/en/news/2020/09/29/http-request-smuggling-cve-2020-25613/ (opens in a new tab)x_transferred
- https://github.com/ruby/webrick/commit/8946bb38b4d87549f0d99ed73c62c41933f97cc7 (opens in a new tab)x_transferred
- FEDORA-2020-02ca18c2a0 (opens in a new tab)vendor-advisoryx_transferred
- FEDORA-2020-fe2a7d7390 (opens in a new tab)vendor-advisoryx_transferred
- https://security.netapp.com/advisory/ntap-20210115-0008/ (opens in a new tab)x_transferred
- [debian-lts-announce] 20230430 [SECURITY] [DLA 3408-1] jruby security update (opens in a new tab)mailing-listx_transferred
- GLSA-202401-27 (opens in a new tab)vendor-advisoryx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-gwfg-cqmg-cf8f (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2020-25613)Record last updated .