Is CVE-2021-3007 actively exploited?

Yes. CVE-2021-3007 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-3007 be exploited remotely?

The attack vector of CVE-2021-3007 has not been classified yet.

What is the CVSS score of CVE-2021-3007?

CVE-2021-3007 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-3007

UNKNOWNCISA KEVIN THE WILD

CVE-2021-3007

Published: April 11, 2026

EPSS:90.27%probability of exploitation in 30 daysPercentile:99.6th

Official 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

NVD Source

Technical Analysis

CVE-2021-3007 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-3007 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.