CVE-2021-20837

EPSS 88.1%

Vexday Risk Score

45Attention

SSVC decision (CISA)

Attend

PoC available → attend closely

CVSS —EPSS 88.1%KEV nãoPoC públicaPatch —

Lifecycle

25 Oct 2021Public PoC

26 Oct 2021Published on NVD

Recommendation: Plan a near-term fix — a public PoC already exists.

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.

Affected products

Six Apart Ltd. · Movable Type

public PoCs found — 6

githubgithub.com/orangmuda/CVE-2021-20837★ 21 githubgithub.com/ghost-nemesis/cve-2021-20837-poc★ 18 githubgithub.com/Cosemz/CVE-2021-20837★ 0 cve_referencepacketstormsecurity.com/files/164705/Movable-Type-7-r.5002-XMLRPC-API-Remote-Command-Injection.htmlunverified cve_referencepacketstormsecurity.com/files/164818/Movable-Type-7-r.5002-XMLRPC-API-Remote-Command-Injection.htmlunverified exploitdbwww.exploit-db.com/exploits/50464unverified

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

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References

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 https://jvn.jp/en/jp/JVN41119755/index.html https://movabletype.org/news/2021/10/mt-782-683-released.html