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CVE-2021-20837

Quick assessment

Affected
Six Apart Ltd. Movable Type
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Six Apart Movable Type（MT）是美国Six Apart公司的一套博客系统。该系统包括多用户、评论、引用和主题等功能。 Movable Type XMLRPC 存在操作系统命令注入漏洞，远程未经身份验证的攻击者可以发送特制消息并在目标系统上执行任意操作系统命令。

AI Predicted 9.8 Difficulty: Trivial EPSS 88.14% · P100

Public Exploits 2

ExploitDB · 1 EDB-50464 [webapps]
Nuclei · 1 CVE-2021-20837.yaml [template]

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-20837

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Six Apart Movable Type 操作系统命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Six Apart Movable Type（MT）是美国Six Apart公司的一套博客系统。该系统包括多用户、评论、引用和主题等功能。 Movable Type XMLRPC 存在操作系统命令注入漏洞，远程未经身份验证的攻击者可以发送特制消息并在目标系统上执行任意操作系统命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Six Apart Ltd. Movable Type 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 -

II. Public POCs for CVE-2021-20837

# POC Description Source Link Shenlong Link
1 PoC for the CVE-2021-20837 : RCE in MovableType https://github.com/ghost-nemesis/cve-2021-20837-poc POC Details
2 XMLRPC - RCE in MovableTypePoC https://github.com/orangmuda/CVE-2021-20837 POC Details
3 MovableType XMLRPC - RCE https://github.com/Cosemz/CVE-2021-20837 POC Details
4 Unauthenticated RCE In MovableType https://github.com/bb33bb/CVE-2021-20837 POC Details
5 XMLRPC RCE via MovableTypePoC CVE-2021-20837 https://github.com/lamcodeofpwnosec/CVE-2021-20837 POC Details
6 A simple workflow that runs all Movable related nuclei templates on a given target. https://github.com/projectdiscovery/nuclei-templates/blob/main/workflows/movable-workflow.yaml POC Details
7 MovableType 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. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-20837.yaml POC Details
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III. Intelligence Information for CVE-2021-20837

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Vendor Advisories for CVE-2021-20837 (1)

Exploits & Public PoCs for CVE-2021-20837 (1)

Other References for CVE-2021-20837 (1)

IV. Related Vulnerabilities

Same product: Movable Type
Same vendor: Six Apart Ltd.

V. Comments for CVE-2021-20837

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