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CVE-2021-20837

Movable Type 7 r.5002 and earlier (Movable Type 7 Series), Movable Type 6.8.2 and earlier (Movable Type 6 Series), Movable Type Advanced 7 r.5002...

Basic Information

CVE State
PUBLISHED
Reserved Date
December 17, 2020
Published Date
October 26, 2021
Last Updated
August 03, 2024
Vendor
Six Apart Ltd.
Product
Movable Type
Description
Movable Type 7 r.5002 and earlier (Movable Type 7 Series), Movable Type 6.8.2 and earlier (Movable Type 6 Series), Movable Type Advanced 7 r.5002 and earlier (Movable Type Advanced 7 Series), Movable Type Advanced 6.8.2 and earlier (Movable Type Advanced 6 Series), Movable Type Premium 1.46 and earlier, and Movable Type Premium Advanced 1.46 and earlier allow remote attackers to execute arbitrary OS commands via unspecified vectors. Note that all versions of Movable Type 4.0 or later including unsupported (End-of-Life, EOL) versions are also affected by this vulnerability.
Tags
nuclei_scanner

CVSS Scores

CVSS v3.1

9.8 - CRITICAL

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

CVSS v2.0

7.5

Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P

EPSS Score

Score
93.76% (Percentile: 99.85%) as of 2025-06-13

Exploit Status

Exploited in the Wild
Yes (2025-05-16 00:00:00 UTC) Source

References

https://movabletype.org/news/2021/10/mt-782-683-released.html https://jvn.jp/en/jp/JVN41119755/index.html http://packetstormsecurity.com/files/164705/Movable-Type-7-r.5002-XMLRPC-API-Remote-Command-Injection.html http://packetstormsecurity.com/files/164818/Movable-Type-7-r.5002-XMLRPC-API-Remote-Command-Injection.html

Known Exploited Vulnerability Information

Source Added Date
The Shadowserver (via CIRCL) 2025-05-16 00:00:00 UTC

Scanner Integrations

Scanner URL Date Detected
Nuclei https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-20837.yaml 2025-04-26 00:00:00 UTC

Potential Proof of Concepts

Warning: These PoCs have not been tested and could contain malware. Use at your own risk.

orangmuda/CVE-2021-20837

Type: github • Created: 2021-10-30 09:15:56 UTC • Stars: 21

XMLRPC - RCE in MovableTypePoC

Timeline

  • CVE ID Reserved

  • CVE Published to Public

  • Detected by Nuclei

  • Added to KEVIntel