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Not in CISA KEV
HIGH severity

CVE-2015-7503 — zendframework

HIGH

CVE-2015-7503 is a high-severity (CVSS 7.5) CWE-320 vulnerability in zendframework/zendframework. A fix is available for zendframework/zendframework — see the affected versions and patch details below.

Zend Framework Information Disclosure

Published
Updated
Affected
4 pkgs
Patched
4 / 4
Exploits
None indexed
Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs72th percentile — riskier than 72% of all scored CVEsHighest risk
0.00%0.62%1.24%1.86%0.2%1.4%May 26Sep 26Nov 26

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

4 pkgs affected
🐘zendframework/zendframework🐘zendframework/zend-crypt🐘zendframework/zend-crypt🐘zendframework/zendframework

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

Zend Framework before 2.4.9, zend-framework/zend-crypt 2.4.x before 2.4.9, and 2.5.x before 2.5.2 allows remote attackers to recover the RSA private key.

Affected Packages

4 total 4 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistzendframework/zendframework≥ 2.5.0&&< 2.5.22.5.2composer require zendframework/zendframework:^2.5.2
🐘Packagistzendframework/zend-crypt≥ 2.0.0&&< 2.4.92.4.9composer require zendframework/zend-crypt:^2.4.9
🐘Packagistzendframework/zend-crypt≥ 2.5.0&&< 2.5.22.5.2composer require zendframework/zend-crypt:^2.5.2
🐘Packagistzendframework/zendframework≥ 2.0.0&&< 2.4.92.4.9composer require zendframework/zendframework:^2.4.9

Affected Products

1 product · 11 configurations
Application
zend frameworkzend
11 versions
2.4.02.4.12.4.22.4.32.4.42.4.52.4.62.4.72.4.82.5.02.5.1

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update zendframework/zendframework to 2.5.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2015-7503 is resolved across your whole dependency graph.

  3. 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

Zend Framework before 2.4.9, zend-framework/zend-crypt 2.4.x before 2.4.9, and 2.5.x before 2.5.2 allows remote attackers to recover the RSA private key.
O3 Security · Impact-Aware SCA

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CVE-2015-7503: zendframework — Fixed in 2.5.2