Is CVE-2015-9096 in the CISA KEV catalog?

No. CVE-2015-9096 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-9096?

CVE-2015-9096 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2015-9096?

CVE-2015-9096 has an EPSS score of 3.65% (88th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-9096?

Upgrade ruby4 on rocky 8 to 0-main@noarch or later. Fixes are available for 8 affected products.

CVE & CISA-KEV Catalog

CVE-2015-9096

MEDIUMEPSS 88th pctl

6.1

CVSS v3

NVD

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.

CWE-93

How to fix

Remediation Available

ruby4Rocky

Fixed in:0-main@noarchRHSA-2026:8838

Fixed in:0-main@aarch64RHSA-2026:8838

Fixed in:0-main@srcRHSA-2026:8838

Fixed in:0-main@x86_64RHSA-2026:8838

ruby4Red Hat / RHEL

Fixed in:0-main@srcRHSA-2026:8838

Fixed in:0-main@x86_64RHSA-2026:8838

Fixed in:0-main@noarchRHSA-2026:8838

Fixed in:0-main@aarch64RHSA-2026:8838

libruby1.9.1Ubuntu

Fixed in:1.9.3.484-2ubuntu1.3USN-3365-1

libruby2.0Ubuntu

Fixed in:2.0.0.484-1ubuntu2.4USN-3365-1

libruby2.3Ubuntu

Fixed in:2.3.1-2~16.04.2USN-3365-1

ruby1.9.1Ubuntu

Fixed in:1.9.3.484-2ubuntu1.3USN-3365-1

ruby2.0Ubuntu

Fixed in:2.0.0.484-1ubuntu2.4USN-3365-1

ruby2.3Ubuntu

Fixed in:2.3.1-2~16.04.2USN-3365-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

3.65%probability of exploitation in 30 days

88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

References

Patch1

github.com

Exploit1

mbsd.jp

Third-Party Advisory2

Other references2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.