CVE-2021-25094
HighExploitedPublic exploitThe Tatsu WordPress plugin before 3.3.12 add_custom_font action can be used without prior authentication to upload a rogue zip file which is uncompressed under the WordPress's upload directory.
Published Apr 25, 2022 · Updated Apr 21, 2025 · Also known as 77ebd648-3851-47ea-a5eb-86af4899727c
Key Facts
Patch immediately- CVE-2021-25094 is a high-severity vulnerability (CVSS 8.1 v3.1) affecting Tatsu (Brandexponents).
- It is exploited in the wild, listed in Industry KEV feed since Nov 18, 2022. Public exploit code is available.
- EPSS estimates a 83% probability of exploitation in the next 30 days.
- Fixed versions are available, including Tatsu 3.3.12, Tatsu 3.3.13.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
83%
Higher than 99.6% of all scored CVEs
Exploited in the wild
Yes
1 catalog listing
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2021-25094 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
The Tatsu WordPress plugin before 3.3.12 add_custom_font action can be used without prior authentication to upload a rogue zip file which is uncompressed under the WordPress's upload directory. By adding a PHP shell with a filename starting with a dot ".", this can bypass extension control implemented in the plugin. Moreover, there is a race condition in the zip extraction process which makes the shell file live long enough on the filesystem to be callable by an attacker.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Nov 18, 2022 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| TatsuBrandexponents | >= 3.3.12 | 3.3.12 |
Patched Releases
Tatsu
3.3.12, 3.3.13
Timeline
Publicly disclosed
Apr 25, 2022
Added to Industry KEV feed
Nov 18, 2022
Last updated
Apr 21, 2025
Weakness Type
- CWE-306 Missing Authentication for Critical Function
- CWE-434 Unrestricted Upload of File with Dangerous Type
References
- advisoryhttps://www.wordfence.com/threat-intel/vulnerabilities/id/77ebd648-3851-47ea-a5eb-86af4899727c?source=api-prod
- advisoryhttps://www.wordfence.com/threat-intel/vulnerabilities/id/77ebd648-3851-47ea-a5eb-86af4899727c?source=api-scan
- exploithttp://packetstormsecurity.com/files/167190/WordPress-Tatsu-Builder-Remote-Code-Execution.html
- exploithttps://darkpills.com/wordpress-tatsu-builder-preauth-rce-cve-2021-25094/
- exploitMSF wp_tatsu_rce.rb
FAQ
Common Questions.
The Tatsu WordPress plugin before 3.3.12 add_custom_font action can be used without prior authentication to upload a rogue zip file which is uncompressed under the WordPress's upload directory.
Affected: Tatsu (Brandexponents) versions >= 3.3.12. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Nov 18, 2022.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Tatsu 3.3.12, Tatsu 3.3.13.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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