KEV Entry

CVE-2025-30355

Known Exploited Vulnerability Entry External Catalog

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Entry Details
Confirmed Exploited

CVE-2025-30355

2025-03-27 00:59 UTC

Timestamps

2025-03-27

2025-03-27

Scope

KEVIntel entry: Synapse vulnerable to federation denial of service via malformed events | Affected: element-hq / synapse | CVSS: 7.1 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: True

References
  • {'id': 'CVE-2025-30355', 'url': 'https://www.cve.org/CVERecord?id=CVE-2025-30355'}
  • {'id': 'kevintel', 'url': 'https://kevintel.com/vuln/CVE-2025-30355'}

a65f73ed-5d55-49a0-ba2d-9b2e44af6342

caeb2787-0d58-4236-9039-7c86c3e566f3

2026-06-19 12:46 UTC

2026-06-19 12:46 UTC

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
public_report kevintel successful_exploitation 0.70
View details 
{
  "added_date": "2025-03-27T00:59:27.996Z",
  "ahead_of_cisa_kev": null,
  "cvss_score": 7.1,
  "cvss_severity": "HIGH",
  "epss_percentile": null,
  "epss_score": null,
  "feed": "KEVIntel (kevintel.com)",
  "not_yet_in_cisa_kev": true,
  "product": "synapse",
  "title": "Synapse vulnerable to federation denial of service via malformed events",
  "used_in_malware": "unknown",
  "vendor": "element-hq"
}
 -
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