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
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 4%CVSS: 6.1Exploit: None knownExposed: 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
33(Track)
EG Risk 33/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity61% × 45%
Exploitation4% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
4%
EPSS %ILE
89%
KEV
Not listed

Published

June 12, 2017

Last Modified

June 17, 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.

Affected Packages

(2 across 2 ecosystems)
Debian:8(1)
PackageVulnerable rangeFixed inDependents
ruby2.12.1.5-2, 2.1.5-2+deb8u1, 2.1.5-2+deb8u2, 2.1.5-2+deb8u32.1.5-2+deb8u4—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
ruby2.32.3.3-12.3.3-1+deb9u1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

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 5× in last 7d / 20× 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.

Showing the most recent 100 of 130 total refreshes for this CVE.

  1. 2026-09-06 13:42 UTCEPSS rescore
  2. 2026-09-04 13:55 UTCEPSS rescore
  3. 2026-09-02 14:07 UTCEPSS rescore
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  9. 2026-07-23 01:20 UTCEG score recompute
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  50. 2026-06-23 21:30 UTCEPSS rescore
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  73. 2026-06-06 13:45 UTCEPSS rescore
  74. 2026-06-05 22:44 UTCEPSS rescore
  75. 2026-06-05 06:08 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

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 June 17, 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 4% probability of exploitation in the next 30 days, which ranks it in the top 11.0% of all scored CVEs.
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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