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CVE-2021-3129

Critical CVSS 9.8 Known exploited

Published 2021-01-12 · last changed 2026-06-17 · added to CISA KEV 2023-09-18

This one is being exploited in the wild.

CISA added CVE-2021-3129 to the Known Exploited Vulnerabilities catalog on 2023-09-18. Federal agencies are required to remediate it on a deadline. If you have affected machines, this is the class of finding that moves ahead of the rest of the queue.

The fix

We hold no Microsoft remediation data for CVE-2021-3129, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

What it is

Ignition before 2.5.2, as used in Laravel and other products, allows unauthenticated remote attackers to execute arbitrary code because of insecure usage of file_get_contents() and file_put_contents(). This is exploitable on sites using debug mode with Laravel before 8.4.2.

Sources

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