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Vulnerabilities

Vulnerability · CVE-2021-36580

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

Published Oct 1, 2026 · catalog updated Oct 1, 2026 · icewarp icewarp_server URL Redirection

Patch now

CVE-2021-36580 is in the CISA known-exploited catalog. Confirm icewarp icewarp_server URL Redirection against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (icewarp icewarp_server URL Redirection).
  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Unknown—
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
1.59%
Remediation
Remediation guidance
Affected products
vendor icewarp icewarp_server

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor icewarp icewarp_serverversion unspecified

How to fix CVE-2021-36580

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2021-36580 is in the CISA known-exploited catalog. Confirm icewarp icewarp_server URL Redirection against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 1.59%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 1, 2026 · VulnCheck KEV

    Detected

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

  2. Oct 1, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Sources

  • CVE.orgVulnerability recordCVE-2021-36580

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-36580

    30-day exploitation probability 1.6%

    first.org
  • VulnCheck KEVConfirmed exploitationCVE-2021-36580

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

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.