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VulnerabilityCVE-2021-3129Published 2021-01-12

CVE-2021-3129 — Laravel

criticalCISA KEVRansomware

As of 2025-11-10, CVE-2021-3129 is a CRITICAL-severity vulnerability in Laravel, CVSS v3.1 9.8, EPSS 94.2% (99.9th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-09-18), with a US federal remediation deadline of 2023-10-09, and CISA links it to known ransomware campaigns. No Threadlinqs-tracked threat campaign has been attributed to CVE-2021-3129 as of 2025-11-10; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

CVSS v3.1
9.8/10Critical
EPSS
94.2%Higher than 99.9% of scored CVEs
CISA KEV
ListedAdded · due 2023-10-09
Tracked threats
0None linked yet
Priority
10/10Threadlinqs triage score
Published
Updated 2025-11-10
CVSS v3.1 9.8 (CRITICAL) · EPSS 94.2% (higher than 99.9% of all scored CVEs) · Priority 10/10 · Published 2021-01-12

Last updated:

What is CVE-2021-3129?

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.

The record classifies CVE-2021-3129 under weakness class NVD-CWE-noinfo. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 2 affected-product entries are recorded, across 2 vendors, listed below. The identifier was first published 2092 days ago.

Severity and exploitation probability

CVSS v3.1 base score
9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (FIRST)
94.2% probability of exploitation in the next 30 days, higher than 99.9% of all scored CVEs
CISA KEV
Listed since 2023-09-18, federal remediation deadline 2023-10-09 — used in known ransomware campaigns
Threadlinqs priority
10/10 — CISA lists it as used in ransomware, which Threadlinqs scores at the maximum
Published
2021-01-12, last modified 2025-11-10

Is CVE-2021-3129 being exploited?

CISA added CVE-2021-3129 to the Known Exploited Vulnerabilities catalog on 2023-09-18, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2023-10-09 under BOD 22-01. CISA flags the vulnerability as one used in known ransomware campaigns. It currently carries a trending score of 45 in the Threadlinqs vulnerability feed.

Affected products and versions

  • Facade: Ignition
  • Laravel: Laravel

How to fix CVE-2021-3129

The record marks a vendor fix as available for CVE-2021-3129. Patch reference: https://github.com/facade/ignition/pull/334. Vendor advisory: https://github.com/facade/ignition/pull/334. Because CVE-2021-3129 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2023-10-09. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2021-3129

No threat campaign in the Threadlinqs corpus currently references CVE-2021-3129, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

Sources

Seeded from nvd and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.