CVE-2021-20837 is a critical OS command injection vulnerability affecting multiple versions of Six Apart Movable Type, including Movable Type 7, 6, Advanced, and Premium series, as well as all unsupported versions 4.0 and later. This flaw allows unauthenticated remote attackers to execute arbitrary operating system commands with high impact on confidentiality, integrity, and availability. With a CVSS score of 9.8 and an EPSS score of 0.94, this vulnerability is highly exploitable. While not currently on CISA's KEV catalog, public exploit code, including a Metasploit module and Nuclei templates, is available, indicating a high potential for active exploitation despite limited community discussion or media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 1.46CPE matchmatch criteria | cpe:2.3:a:sixapart:movable_type:*:*:*:*:premium:*:*:* | ||
<= 1.46CPE matchmatch criteria | cpe:2.3:a:sixapart:movable_type:*:*:*:*:premium_advanced:*:*:* | ||
>= 4.0, <= 6.3.11CPE matchmatch criteria | cpe:2.3:a:sixapart:movable_type:*:*:*:*:*:*:*:* | ||
>= 6.5.0, <= 6.8.2CPE matchmatch criteria | cpe:2.3:a:sixapart:movable_type:*:*:*:*:-:*:*:* | ||
>= 6.5.0, <= 6.8.2CPE matchmatch criteria | cpe:2.3:a:sixapart:movable_type:*:*:*:*:advanced:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.