KEV Entry

CVE-2021-20837

Known Exploited Vulnerability Entry Previdian

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Entry Details
Confirmed Exploited

CVE-2021-20837

2025-06-13 02:00 CEST

Timestamps

2025-06-13

2025-06-13

Scope

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... | Affected: Six Apart / Movable Type | CVSS: 9.8 (CRITICAL) | EPSS: 0.88144 | Used in malware: unknown | Not yet in CISA KEV: True

References
  • {'id': 'CVE-2021-20837', 'url': 'https://www.cve.org/CVERecord?id=CVE-2021-20837'}
  • {'id': 'previdian', 'url': 'https://previdian.com/CVE-2021-20837'}

0948eb2c-73a1-42fc-8d10-02e968b7b3bd

Previdian
caeb2787-0d58-4236-9039-7c86c3e566f3

2026-10-02 09:09 CEST

2026-10-02 09:09 CEST

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
public_report previdian successful_exploitation 0.70
View details 
{
  "added_date": "2025-06-13T00:00:00.000Z",
  "ahead_of_cisa_kev": null,
  "cve_id": "CVE-2021-20837",
  "cvss_estimated": false,
  "cvss_score": 9.8,
  "cvss_severity": "CRITICAL",
  "epss_percentile": 0.99765,
  "epss_score": 0.88144,
  "feed": "Previdian (previdian.com)",
  "ghsa_id": null,
  "not_yet_in_cisa_kev": true,
  "previous_ids": [],
  "product": "Movable Type",
  "title": "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...",
  "used_in_malware": "unknown",
  "vendor": "Six Apart",
  "virtual_patch": false,
  "vulnerability_id": "CVE-2021-20837"
}
 -
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