CVE-2021-3007: Laminas Project laminas-http before 2.14.2, and Zend Framework 3.0.0, has a deserialization vulnerability that

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CRITICAL 9.8REMOTEUPGRADEDOWNGRADE

CVE-2021-3007 is a critical-severity flaw (CVSS 9.8) affecting laminas-http, zend framework. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 checki

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	75.3% (top 1%)
CISA exploited list	No
Weakness	CWE-502
Published	2021-01-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: getlaminas · zend

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-01-04 03:15 UTCPublished CVE record published
2026-06-17 04:04 UTCUpdated Record last modified

getlaminas laminas-http UPGRADE

Affected: < 2.14.2

Fixed in: 2.14.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy laminas-http || rpm -q laminas-http || laminas-http --version

2. UPGRADE to 2.14.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade laminas-http

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade laminas-http

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

zend zend framework DOWNGRADE

Affected: 3.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0.0

1. Check installed version

apt-cache policy zend-framework || rpm -q zend-framework || zend-framework --version

2. No fixed release: DOWNGRADE to a release before 3.0.0 (Debian / Ubuntu)

apt-cache madison zend-framework sudo apt install zend-framework=<VERSION_BEFORE_3.0.0> sudo apt-mark hold zend-framework

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list zend-framework sudo dnf downgrade zend-framework-<VERSION_BEFORE_3.0.0> sudo dnf versionlock add zend-framework

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Composer (PHP) · zendframework/zendframework · NO FIX YET · vulnerable: <= 3.0.0 · source

Composer (PHP) · laminas/laminas-http · FIXED · 2.14.2 · vulnerable: < 2.14.2 · source

composer require "laminas/laminas-http:>=2.14.2"

Fedora 46 · root · FIXED · 6.40.04-6.fc46 · FEDORA-2026-deac340022 · source

sudo dnf upgrade --advisory=FEDORA-2026-deac340022

Fedora ELN · man-pages · FIXED · 6.20-1.eln159 · FEDORA-2026-f1f5fb11b4 · source

sudo dnf upgrade --advisory=FEDORA-2026-f1f5fb11b4

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: Vulnmachines/ZF3_CVE-2021-3007 (1 stars)
GitHub PoC: yunus-a1i/CVE-2021-3007-docker-poc (0 stars)
GitHub PoC: KrE80r/cve-2021-3007-vulnerable (0 stars)
Write-up: github.com/Ling-Yizhou/zendframework3-/blob/main/zend%20framework3%20%E5%8F%8D%E5%BA%8F%E5
Nuclei scan template: Laminas Project laminas-http - Remote Code Execution

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-3007?

laminas-http: upgrade to 2.14.2; zend framework: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-3007 being exploited?

CVE-2021-3007 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-3007 affect?

CVE-2021-3007 affects laminas-http, zend framework. Severity is critical (CVSS 9.8). 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\Stre

How urgent is CVE-2021-3007?

Priority 69/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

References

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