How severe is GHSA-xx8f-qf9f-5fgw?

GHSA-xx8f-qf9f-5fgw has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by GHSA-xx8f-qf9f-5fgw?

GHSA-xx8f-qf9f-5fgw affects the following packages: zendframework/zendframework (Packagist), laminas/laminas-http (Packagist). Ecosystems affected: Packagist.

How do I fix GHSA-xx8f-qf9f-5fgw?

No fixed version has been published for GHSA-xx8f-qf9f-5fgw yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is GHSA-xx8f-qf9f-5fgw actively exploited in the wild?

Yes. There are 5 known exploit references for GHSA-xx8f-qf9f-5fgw, including 5 in-the-wild exploitations 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 GHSA-xx8f-qf9f-5fgw?

GHSA-xx8f-qf9f-5fgw has an EPSS (Exploit Prediction Scoring System) score of 92.2%, placing it in the 100th 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. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

What type of vulnerability is GHSA-xx8f-qf9f-5fgw?

GHSA-xx8f-qf9f-5fgw is classified as Deserialization of Untrusted Data (CWE-502). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

Is there exploit tooling available for GHSA-xx8f-qf9f-5fgw?

A Nuclei detection template exists for GHSA-xx8f-qf9f-5fgw, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was GHSA-xx8f-qf9f-5fgw published, and has it been updated?

GHSA-xx8f-qf9f-5fgw was published on June 8, 2021 and was last updated on April 22, 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

GHSA-xx8f-qf9f-5fgw

CRITICAL

Remote code execution in zendframework and laminas-http

Also known asCVE-2021-3007

Published

Jun 8, 2021

Updated

Apr 22, 2024

Affected

2 pkgs

Patched

1 / 2

Exploits

5 known

EPSS Exploitation Probability

via FIRST.org ↗

92.2%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

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.

Blast Radius

2 pkgs affected

🐘zendframework/zendframework🐘laminas/laminas-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

Laminas Project laminas-http before 2.14.2, and Zend Framework 3.0.0, has a deserialization vulnerability that can lead to remote code execution if the content is controllable, related to the __destruct method of the Zend\Http\Response\Stream class in Stream.php. NOTE: Zend Framework is no longer supported by the maintainer. NOTE: the laminas-http vendor considers this a "vulnerability in the PHP language itself" but has added certain type checking as a way to prevent exploitation in (unrecommended) use cases where attacker-supplied data can be deserialized.

Affected Packages

2 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`zendframework/zendframework`	all versions	No fix
🐘Packagist	`laminas/laminas-http`	all versions	2.14.2

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.