CVE-2025-40630Network attack vector

Arbitrary-domain redirection via crafted URL path

Published May 16, 2025 · Updated May 16, 2025

Open redirection in IceWarp Mail Server 11.4.0 allows remote attackers to send links that redirect users to arbitrary domains. The web endpoint interprets a crafted path beginning with repeated slashes and an encoded parent-directory segment as an external destination. No authentication is required, but a victim must open the malicious URL in a browser; testing was reported only in Firefox.

CVSS severity5.1
Medium
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirection in IceWarp Mail Server 11.4.0 allows remote attackers to send links that redirect users to arbitrary domains. The web endpoint interprets a crafted path beginning with repeated slashes and an encoded parent-directory segment as an external destination. No authentication is required, but a victim must open the malicious URL in a browser; testing was reported only in Firefox.

The record

CVE
CVE-2025-40630
Published
May 16, 2025
Updated
May 16, 2025
Vendor
IceWarp
Product
IceWarp Server
Classifications
CWE-601, CAPEC-178, T1566.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 16, 2025CVE publishedPublication date reported by the CVE source.
  2. May 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=11.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IceWarp · IceWarp Serverversion=11.4.0

Published CVSS scores

6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.1INCIBECVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
CAPEC-178Cross-Site Flashing
T1566.002Spearphishing Link

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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