CVE-2019-16254: debian debian_linux
Vulnerability summary
CVE-2019-16254 is a medium (CVSS 5.3) vulnerability in debian debian_linux. EPSS estimates a 4.57% chance of exploitation in the next 30 days, higher than 91.6% of scored vulnerabilities.
Not severe (CVSS 5.3, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 21 · Related 4Timeline
- 26-11-2019PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
Ruby through 2.4.7, 2.5.x through 2.5.6, and 2.6.x through 2.6.4 allows HTTP Response Splitting. If a program using WEBrick inserts untrusted input into the response header, an attacker can exploit it to insert a newline character to split a header, and inject malicious content to deceive clients. NOTE: this issue exists because of an incomplete fix for CVE-2017-17742, which addressed the CRLF vector, but did not address an isolated CR or an isolated LF.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- OSV · UbuntuEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- OSV · DebianEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS trend
Probability
4.57%
Chance of exploitation in the next 30 days
Percentile
92%
Versus all other CVEs
30-day change
No change 0.00 pp
From 4.57% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu3 products
- jruby< 1.5.6-9+deb8u2build0.14.04.1~esm2
- ruby2.3< 2.3.1-2~ubuntu16.04.14
- ruby2.5< 2.5.1-1ubuntu1.6
Debian2 products
- jruby< 9.3.9.0+ds-1
- debian_linuxEOL8.0
Alpine1 product
- ruby≥ 2.4.0, < 2.5.7-r0 | ≥ 2.4.0, < 2.6.5-r0 | ≥ 2.4.0, < 2.4.10-r0
Ruby-lang1 product
- ruby≤ 2.3.0 | ≥ 2.4.0, ≤ 2.4.7 | ≥ 2.5.0, ≤ 2.5.6 | ≥ 2.6.0, ≤ 2.6.4
4 vendors · 7 products
References
23 links- hackerone.com/reports/331984Third Party Advisory
- www.ruby-lang.org/ja/news/2019/10/01/ruby-2-6-5-released/Vendor Advisory
- www.ruby-lang.org/ja/news/2019/10/01/ruby-2-5-7-released/Vendor Advisory
- www.ruby-lang.org/ja/news/2019/10/01/ruby-2-4-8-released/Vendor Advisory
- seclists.org/bugtraq/2019/Dec/31Mailing List
- seclists.org/bugtraq/2019/Dec/32Mailing List
- www.debian.org/security/2019/dsa-4587Vendor Advisory
Show all 23 references
- www.debian.org/security/2019/dsa-4586Vendor Advisory
- security.gentoo.org/glsa/202003-06Vendor Advisory
