How severe is CVE-2015-3154?

CVE-2015-3154 has a CVSS score of 6.1/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2015-3154?

CVE-2015-3154 affects the following packages: zendframework/zend-http (Packagist), zendframework/zend-http (Packagist), zendframework/zendframework (Packagist), zendframework/zendframework (Packagist), zendframework/zendframework1 (Packagist), zendframework/zend-http (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2015-3154?

Update zendframework/zend-http to 2.3.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2015-3154 is resolved across your whole dependency graph.

How do I detect CVE-2015-3154 in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for zendframework/zend-http, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2015-3154 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2015-3154 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2015-3154, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2015-3154?

CVE-2015-3154 has an EPSS (Exploit Prediction Scoring System) score of 1.0%, placing it in the 63th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2015-3154?

CVE-2015-3154 is classified as CWE-74 (CWE-74). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2015-3154 published, and has it been updated?

CVE-2015-3154 was published on May 24, 2022 and was last updated on February 16, 2024. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘

🐘 Packagist

Not in CISA KEV

MEDIUM severity

CVE-2015-3154 — zend-http

MEDIUM

CVE-2015-3154 is a medium-severity (CVSS 6.1) CWE-74 vulnerability in zendframework/zend-http. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for zendframework/zend-http — see the affected versions and patch details below.

Zenario CMS vulnerable to CRLF injection

Published

May 24, 2022

Updated

Feb 16, 2024

Affected

6 pkgs

Patched

6 / 6

Exploits

1 known

Exploitation data as of Nov 1, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

1.0%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs63th percentile — riskier than 63% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

6 pkgs affected

🐘zendframework/zend-http🐘zendframework/zend-http🐘zendframework/zendframework🐘zendframework/zendframework🐘zendframework/zendframework1🐘zendframework/zend-http

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

6 total 6 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`zendframework/zend-http`	≥ 2.0.0beta4&&< 2.3.8	2.3.8`composer require zendframework/zend-http:^2.3.8`
🐘Packagist	`zendframework/zend-http`	≥ 2.4.0rc1&&< 2.4.1	2.4.1`composer require zendframework/zend-http:^2.4.1`
🐘Packagist	`zendframework/zendframework`	≥ 2.0.0beta4&&< 2.3.8	2.3.8`composer require zendframework/zendframework:^2.3.8`
🐘Packagist	`zendframework/zendframework`	≥ 2.4.0rc1&&< 2.4.1	2.4.1`composer require zendframework/zendframework:^2.4.1`
🐘Packagist	`zendframework/zendframework1`	all versions	1.12.12`composer require zendframework/zendframework1:^1.12.12`
🐘Packagist	`zendframework/zend-http`	all versions	1.12.12`composer require zendframework/zend-http:^1.12.12`

Affected Products

1 product · 3 configurations

Application

zend frameworkzend

≥ 2.4.0 && < 2.4.1

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

CRLF injection vulnerability in Zend\Mail (Zend_Mail) in Zend Framework …

framework.zend.comNVDJan 2020

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for zendframework/zend-http, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update zendframework/zend-http to 2.3.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2015-3154 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2015-3154 in your dependencies?

Find it across Packagist, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

6.1/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE Classification

CWE-74CWE-74

Weaponization

No Nuclei template or Metasploit module yet. 1 public proof-of-concept reference is listed on this page.

OpenSSF Scorecard

Package health score

security-advisories

4.8/10

Maintained10/10

Code-Review10/10

Branch-Protection0/10

Assessed Oct 26, 2026

Timeline

First exploit

Jan 30, 2020

Disclosed

May 24, 2022

Last updated

Feb 16, 2024

Identifiers

CVE-2015-3154

References

Advisorynvd.nist.gov · CVE 2015 3154 Webframework.zend.com · ZF2015 04 Webgithub.com · CVE 2015 3154.yaml Webgithub.com · CVE 2015 3154.yaml Webgithub.com · CVE 2015 3154.yaml Packagegithub.com · zendframework

Related vulnerabilities

Also affects zendframework/zend-http

This CVE is medium severity; 2 of 2 other CVEs affecting zendframework/zend-http are rated as high or higher (top: high).

GHSA-cg8w-5jrc-675gGHSA-f6p5-76fp-m248

Also affects zendframework/zendframework

This CVE is medium severity, in line with the other 6 CVEs affecting zendframework/zendframework.

GHSA-2fhr-8r8r-qp56GHSA-5gmf-3c43-q73vGHSA-62f6-h68r-3jpwGHSA-8q77-cv62-jj38GHSA-fh7r-58q4-6387GHSA-gff2-p6vm-3p8g

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedFeb 16, 2024