What’s Vulnerable › Vulnerabilities

CVE-2015-9096

• Severity: medium (CVSS 6.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2017-06-12 · updated 2026-06-17
• Weakness: CWE-93

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.

Affected products

• Ruby: through 2.4.0

References

• http://www.mbsd.jp/Whitepaper/smtpi.pdf
• https://github.com/ruby/ruby/commit/0827a7e52ba3d957a634b063bf5a391239b9ffee
• https://github.com/rubysec/ruby-advisory-db/issues/215
• https://hackerone.com/reports/137631
• 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.pdf
• https://github.com/ruby/ruby/commit/0827a7e52ba3d957a634b063bf5a391239b9ffee
• https://github.com/rubysec/ruby-advisory-db/issues/215
• https://hackerone.com/reports/137631
• https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
• https://www.debian.org/security/2017/dsa-3966

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