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CVE-2015-9096

18
FAUCET Score

CVE-2015-9096 describes an SMTP command injection vulnerability in Net::SMTP within Ruby versions prior to 2.4.0. This flaw allows attackers to inject arbitrary SMTP commands by including CRLF sequences in the RCPT TO or MAIL FROM commands. Rated as Medium severity (CVSS 6.1), it requires user interaction and can lead to partial confidentiality and integrity impacts, though it does not affect availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.4.0CPE matchmatch criteria
cpe:2.3:a:ruby-lang:ruby:*:rc1:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.1MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.67%
Probability of exploitation in next 30 days
EPSS Percentile
88.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0367 is in the 95th percentile among its peer group of 26,234 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (9)

github_advisorypatch availablevia nvd_reference
View patch
redhatend of lifevia redhat_api
Product: CloudForms Management Engine 5Fixed in: rh-ruby22-ruby
redhatend of lifevia redhat_api
Product: CloudForms Management Engine 5Fixed in: ruby-200-ruby
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: ruby
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: ruby
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: ruby
redhatend of lifevia redhat_api
Product: Red Hat Software CollectionsFixed in: rh-ruby22-ruby
redhatend of lifevia redhat_api
Product: Red Hat Software CollectionsFixed in: rh-ruby23-ruby
redhatend of lifevia redhat_api
Product: Red Hat Subscription Asset ManagerFixed in: ruby193-ruby

Vendor Advisories (1)

redhatCVE-2015-9096Low

ruby: SMTP command injection via CRLF sequences in RCPT TO or MAIL FROM commands in Net::SMTP

Jun 12, 2017

References

github.com / ruby/ruby/commit/0827a7e52ba3d957a634b063bf5a391239b9ffee
PatchThird Party Advisory
github.com / rubysec/ruby-advisory-db/issues/215
Issue TrackingThird Party Advisory
hackerone.com / reports/137631
Third Party Advisory
lists.debian.org / debian-lts-announce/2018/07/msg00012.html
debian.org / security/2017/dsa-3966
mbsd.jp / Whitepaper/smtpi.pdf
ExploitThird Party Advisory