CVE-2020-13671

8.8 HIGH 36% exploit odds exploited in the wild Fix listed Code execution Web app

What it is

Drupal core does not properly sanitize certain filenames on uploaded files, which can lead to files being interpreted as the incorrect extension and served as the wrong MIME type or executed as PHP for certain hosting configurations. This issue affects: Drupal Drupal Core 9.0 versions prior to 9.0.8, 8.9 versions prior to 8.9.9, 8.8 versions prior to 8.8.11, and 7 versions prior to 7.74.

At a glance

Exploitability: Can be exploited over the network with a low-privilege account. High risk of data exposure, data tampering, service disruption.
In the wild: CISA lists this as exploited in real attacks. Treat as urgent.
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2020-05-28 00:00 UTC ReservedThe CVE id was reserved by its CNA
2020-11-20 16:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2022-01-18 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
2022-07-18 Remediation deadlineCISA's due date for federal agencies to fix it
2026-06-17 02:53 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
Exploit odds: 36.2% in the next 30 days (EPSS).
Severity: 8.8 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2020-11-20 16:15 UTC
Last modified: 2026-06-17 02:53 UTC
Added to CISA KEV: 2022-01-18
Exploit probability: 36.2% · EPSS, next 30 days
Weakness: CWE-434 · Unrestricted file upload
Record status: Analyzed

Affected

Drupal < 7.74
Drupal < 8.8.11
Drupal < 8.9.9
Drupal < 9.0.8
Fedoraproject Fedora 32
Fedoraproject Fedora 33

Attack profile CVSS 3.1 · 8.8

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Raw vector

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

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2020-13671.md and follow it. Check whether this project is affected by CVE-2020-13671. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record