CVE-2021-3129

Laravel Ignition File Upload Vulnerability

IN CISA KEV

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.

Vendor: Laravel
Product: Ignition
CVSS 3.1: 9.8 (critical), scored by NVD (primary)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1: 9.8 (critical), scored by 134c704f-9b21-4f2e-91b3-4a467353bcc0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: Not recorded
Published: 2021-01-12
NVD modified: 2026-06-17
NVD status: Analyzed

CISA KEV

Date added: 2023-09-18
Due date: 2023-10-09
Ransomware use: Known
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

EPSS

100% chance of exploitation in the next 30 days (percentile 99th)

FIRST EPSS, updated 17 Oct 2026. About EPSS

CVSS is severity, EPSS is likelihood, KEV means already exploited. EPSS is a statistical probability, not a certainty: a low score does not make a bug safe, and a high one does not prove it is being exploited.

References

github.com (Patch, Third Party Advisory)
github.com (Patch, Third Party Advisory)
www.cisa.gov (US Government Resource)

Data last updated 18 Oct 2026. Sources: NVD API 2.0, CISA KEV catalog, FIRST EPSS. Links: NVD, CISA KEV. Metadata only. ThreatWire does not host exploit code.