CVE-2015-9096

MEDIUMNVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

Score 6.1 from GitHub Security Advisory published 2022-05-14. NVD baseline CVSS 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.1
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 4%CVSS: 6.1Exploit: NoneExposed: 0

A fix is available — apply it.

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 v3
6.1
EG Score
6.1(medium)
EG Risk
—
EPSS
88.5%
KEV
Not listed

Published

June 12, 2017

Last Modified

May 13, 2026

References (12)

Vendor Advisories for CVE-2015-9096(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubunturuby2.3 (2.3.3-1ubuntu0.1) @ zesty2026-05-22ubuntu
redhatruby4-0-main-4.0.0-33.3.hum12026-04-17redhat
redhatruby3-3-main-3.3.10-23.1.hum12026-04-09redhat
redhatruby3-4-main-3.4.8-31.1.hum12026-04-09redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 11× in last 7d / 40× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 22:00 UTCEG score recompute
  2. 2026-07-22 14:04 UTCEPSS rescore
  3. 2026-07-21 15:21 UTCEPSS rescore
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  47. 2026-05-31 22:28 UTCEPSS rescore
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  49. 2026-05-31 00:14 UTCEPSS rescore
  50. 2026-05-29 13:41 UTCEPSS rescore
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  59. 2026-05-22 21:15 UTCEPSS rescore
  60. 2026-05-22 12:42 UTCEG score recompute
  61. 2026-05-22 12:42 UTCVendor advisory
  62. 2026-05-22 12:42 UTCGHSA enrichment
  63. 2026-05-21 22:40 UTCEPSS rescore
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  69. 2026-05-18 21:30 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2015-9096?
CVE-2015-9096 is a medium vulnerability published on June 12, 2017. 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.
When was CVE-2015-9096 disclosed?
CVE-2015-9096 was first published in the National Vulnerability Database on June 12, 2017, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-9096 actively exploited?
CVE-2015-9096 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 88.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2015-9096?
CVE-2015-9096 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2015-9096?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-9096, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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