CVE-2015-9096

Exp

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.

Published: 2017-06-12 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2015-9096 is rated High Exploit Risk (72.3/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 3.65%). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +2.05% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2015-9096

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2015-9096

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.59% 3.65% +2.05%
2 2025-12-28 1.10% 1.59% +0.49%
3 2025-12-27 — 1.10% —

Full EPSS history (17 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2015-9096

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 3.0 MEDIUM
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2015-9096

OS Trackers for CVE-2015-9096

vendor priority summary link
redhat low — https://access.redhat.com/security/cve/CVE-2015-9096
suse medium CVE-2015-9096 severity moderate: SUSE including 12 source package names (libruby2_1-2_1-2.1.9-19.3.2, ruby, …), 167 product×package rows across 64 product lines (HPE Helion OpenStack 8, Image SLES12-SP5-Azure-BYOS, … (64 product lines)): Fixed 125, Known Not Affected 23, Will Not Fix 19. https://www.suse.com/security/cve/CVE-2015-9096/
ubuntu medium CVE-2015-9096 medium priority: Ubuntu including 3 source packages (ruby1.9.1, ruby2.0, ruby2.3), 15 status rows across 5 suites (trusty, upstream, xenial, yakkety, zesty): DNE 7, released 4, needed 3, ignored 1. https://ubuntu.com/security/CVE-2015-9096

Affected software / configurations for CVE-2015-9096

Vendor Product Version Raw CPE
ruby-lang ruby <= 2.4.0 cpe:2.3:a:ruby-lang:ruby:*:rc1:*:*:*:*:*:*

References for CVE-2015-9096

cvelogic Threat Intelligence