What is CVE-2015-3154?

CVE-2015-3154 is a medium-severity vulnerability in Zend Framework, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.1/10. Published 2020-01-27.

How severe is CVE-2015-3154?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Vulnerability in Zend Framework

CVE-2015-3154

CRLF injection vulnerability in Zend\Mail (Zend_Mail) in Zend Framework before 1.12.12, 2.x before 2.3.8, and 2.4.x before 2.4.1 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via CRLF sequences in the header of an email.

Published 2020-01-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.010 (61.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 61.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Zend Framework
Zend Technologies Framework — versions 2.4.x before 2.4.1, 2.x before 2.3.8, before 1.12.12

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

framework.zend.com/security/advisory/ZF2015-04 (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2015-3154?: CVE-2015-3154 is a medium-severity vulnerability in Zend Framework, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.1/10. Published 2020-01-27.
How severe is CVE-2015-3154?: Medium severity. CVSS v3 base score is 6.1 out of 10.