CVE-2015-9096
Net::SMTP in Ruby before 2.4.0 is vulnerable to SMTP command injection via CRLF sequences in a RCPT TO or MAIL FROM command, as demonstrated by CRLF sequences immediately before and after a DATA substring.
Does this matter?
Lower severity and a low EPSS score (3.69%). Track it; it rarely justifies an emergency change on its own.
Description
Net::SMTP in Ruby before 2.4.0 is vulnerable to SMTP command injection via CRLF sequences in a RCPT TO or MAIL FROM command, as demonstrated by CRLF sequences immediately before and after a DATA substring.
- CVSS 3.0
- 6.1 MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 3.69% probability · 90th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-93
- Affected
- ruby-lang/ruby
- Source
- cve@mitre.org
EPSS 3.7% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.mbsd.jp/Whitepaper/smtpi.pdfExploit, Third Party Advisory
- https://github.com/ruby/ruby/commit/0827a7e52ba3d957a634b063bf5a391239b9ffeePatch, Third Party Advisory
- https://github.com/rubysec/ruby-advisory-db/issues/215Issue Tracking, Third Party Advisory
- https://hackerone.com/reports/137631Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
- https://www.debian.org/security/2017/dsa-3966
- http://www.mbsd.jp/Whitepaper/smtpi.pdfExploit, Third Party Advisory
- https://github.com/ruby/ruby/commit/0827a7e52ba3d957a634b063bf5a391239b9ffeePatch, Third Party Advisory
- https://github.com/rubysec/ruby-advisory-db/issues/215Issue Tracking, Third Party Advisory
- https://hackerone.com/reports/137631Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
- https://www.debian.org/security/2017/dsa-3966
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.