CVE-2021-20837

CRITICAL EPSS 99.7%
Published Oct 26, 20214y ago · Modified Jun 17, 20262w ago
9.8 CVSS 3.1
Critical
Find Similar
Published Oct 26, 2021 4y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
99.7% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available

Weaknesses 1

CWE-78 OS Command Injection Injection

Affected Products 7

VendorProductVersionRange
sixapartmovable_type* ≤1.46
sixapartmovable_type* ≤1.46
sixapartmovable_type*≥4.0  –  ≤6.3.11
sixapartmovable_type*≥6.5.0  –  ≤6.8.2
sixapartmovable_type*≥6.5.0  –  ≤6.8.2
sixapartmovable_type*≥7.0  –  ≤7.8.1
sixapartmovable_type*≥7.0  –  ≤7.8.1

References 4

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.