Remote code execution in zendframework and laminas-http

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

9.8 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

• CVE-2021-3007: 75.31% estimated exploitation activity in the next 30 days; percentile 99.52 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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.

Published by the source

8 Jun 2021, 20:11 UTC

Last modified by the source

22 Apr 2024, 19:04 UTC

Source last checked

26 Oct 2026, 14:19 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-xx8f-qf9f-5fgw

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# Patch Next advisory brief: CVE-2021-3007

Advisory: Remote code execution in zendframework and laminas-http
IDs: CVE-2021-3007, GHSA-xx8f-qf9f-5fgw
Record: https://patchnext.com/advisories/cve-2021-3007 (revision 1, source checked 26 Oct 2026, 14:19 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: laminas/laminas-http 2.14.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist zendframework/zendframework: affected <= 3.0.0
- Packagist laminas/laminas-http: affected < 2.14.2; fixed in 2.14.2

## Suggested inspection (read-only)
- Packagist zendframework/zendframework: check the installed version with your package manager.
- Packagist laminas/laminas-http: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on zendframework/zendframework, laminas/laminas-http.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-xx8f-qf9f-5fgw (GitHub-reviewed advisory GHSA-xx8f-qf9f-5fgw lists affected ranges: Packagist zendframework/zendframework >=0 =0 <2.14.2)

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