CVE-2025-2690: A vulnerability, which was classified as critical, was found in yiisoft Yii2 up to 2.0.39

This month

MEDIUM 6.3UPGRADE

CVE-2025-2690 is a medium-severity flaw (CVSS 6.3) affecting yii. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability, which was classified as critical, was found in yiisoft Yii2 up to 2.0.39. This affects the function Generate of the file phpunit\src\Framework\MockObject\MockClass.php. The manipulation leads to deserialization. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-20, CWE-502
Published	2025-03-24
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: yiiframework

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

Am I affected?

Timeline

2025-03-24 08:15 UTCPublished CVE record published
2026-06-17 09:07 UTCUpdated Record last modified

yiiframework yii UPGRADE

Affected: >= 2.0.0 and <= 2.0.39

Fixed in: newer than 2.0.39

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy yii || rpm -q yii || yii --version

2. UPGRADE to newer than 2.0.39 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade yii

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade yii

Note

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

3. If no update is available yet, DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison yii sudo apt install yii=<VERSION_BEFORE_2.0.0> sudo apt-mark hold yii

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list yii sudo dnf downgrade yii-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add yii

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.

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-2025-2690?

yii: upgrade to newer than 2.0.39. Exact commands for each OS are on this page.

Is CVE-2025-2690 being exploited?

CVE-2025-2690 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-2025-2690 affect?

CVE-2025-2690 affects yii. Severity is medium (CVSS 6.3). A vulnerability, which was classified as critical, was found in yiisoft Yii2 up to 2.0.39. This affects the function Generate of the file phpunit\src\Framework\MockObject\MockClass.php. The manipulation leads to deserialization. It is possi

How urgent is CVE-2025-2690?

Priority 40/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

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References

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