CVE-2015-7503 — zendframework/zendframewo…
HIGHCVE-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
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
CVE-2015-7503 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,333 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
zendframework/zendframework🐘zendframework/zend-crypt🐘zendframework/zend-crypt🐘zendframework/zendframeworkReal-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
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | zendframework/zendframework | ≥ 2.5.0&&< 2.5.2 | 2.5.2composer require zendframework/zendframework:^2.5.2 |
| 🐘Packagist | zendframework/zend-crypt | ≥ 2.0.0&&< 2.4.9 | 2.4.9composer require zendframework/zend-crypt:^2.4.9 |
| 🐘Packagist | zendframework/zend-crypt | ≥ 2.5.0&&< 2.5.2 | 2.5.2composer require zendframework/zend-crypt:^2.5.2 |
| 🐘Packagist | zendframework/zendframework | ≥ 2.0.0&&< 2.4.9 | 2.4.9composer require zendframework/zendframework:^2.4.9 |
Detection & mitigation playbook
Open-source dependencyDetect
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.
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.
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.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2015-7503 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2015-7503. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2015-7503 in your dependencies?
O3 Security finds CVE-2015-7503 across Packagist dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.