CVE-2015-8476

Multiple CRLF injection vulnerabilities in PHPMailer before 5.2.14 allow attackers to inject arbitrary SMTP commands via CRLF sequences in an (1) email address to the validateAddress function in class.phpmailer.php or (2) SMTP command to the sendCommand function in class.smtp.php, a different vulnerability than CVE-2012-0796.

Published: 2015-12-16 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2015-8476 is rated Moderate Risk (46.2/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.95%). Review affected assets and schedule remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2015-8476

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 2025-07-02 1.11% 0.95% -0.17%
2 2025-03-30 2.16% 1.11% -1.04%
3 2025-03-29 — 2.16% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2015-8476

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/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:L)
Exploitation conditions are straightforward and predictable.
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.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2015-8476

GitHub Security Advisory for CVE-2015-8476

OS Trackers for CVE-2015-8476

vendor priority summary link
debian not yet assigned CVE-2015-8476 not yet assigned priority: Debian including 1 source packages (libphp-phpmailer), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2015-8476
ubuntu medium CVE-2015-8476 medium priority: Ubuntu including 1 source packages (libphp-phpmailer), 6 status rows across 6 suites (precise, trusty, upstream, vivid, wily, xenial): released 4, ignored 1, not-affected 1. https://ubuntu.com/security/CVE-2015-8476

Affected software / configurations for CVE-2015-8476

Vendor Product Version Raw CPE
debian debian_linux 6.0 cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:*
debian debian_linux 7.0 cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
phpmailer_project phpmailer <= 5.2.13 cpe:2.3:a:phpmailer_project:phpmailer:*:*:*:*:*:*:*:*

References for CVE-2015-8476

cvelogic Threat Intelligence