Risk Letters

Exploited vulnerability

CVE-2021-36580

TLP:CLEAR

icewarp icewarp_server URL Redirection to Untrusted Site ('Open Redirect')

Open Redirect vulnerability exists in IceWarp MailServer IceWarp Server Deep Castle 2 Update 1 (13.0.1.2) via the referer parameter.

Facts

  • Vendor: icewarp
  • Product: icewarp_server
  • EPSS (probability of exploitation within 30 days): 1.6 %
  • First known exploitation: 1 October 2026
  • First seen by Risk Letters: 1 October 2026

Members see which Nordic sectors the flaw hits, and what to do about it.

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD