VDB-309279 · CVE-2025-40631 · GCVE-0-2025-40631

Icewarp Mail Server 11.4.0 HTTP Header Host http headers for scripting syntax

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.6	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Icewarp Mail Server 11.4.0. It has been classified as problematic. This vulnerability affects unknown code of the component HTTP Header Handler. Performing a manipulation of the argument Host results in improper neutralization of http headers for scripting syntax. This vulnerability is cataloged as CVE-2025-40631. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Icewarp Mail Server 11.4.0. This affects an unknown code block of the component HTTP Header Handler. The manipulation of the argument Host with an unknown input leads to a improper neutralization of http headers for scripting syntax vulnerability. CWE is classifying the issue as CWE-644. The product does not neutralize or incorrectly neutralizes web scripting syntax in HTTP headers that can be used by web browser components that can process raw headers, such as Flash. This is going to have an impact on integrity. The summary by CVE is:

HTTP host header injection vulnerability in Icewarp Mail Server affecting version 11.4.0. By modifying the Host header and adding a payload, arbitrary JavaScript code can be executed on page load. The user must interact with a malicious link to be redirected.

The weakness was shared by B3xal. It is possible to read the advisory at incibe.es. This vulnerability is uniquely identified as CVE-2025-40631 since 04/16/2025. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/10/2025).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Mail Server Software

Vendor

Icewarp

Name

Mail Server

Version

11.4.0

License

commercial

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔍
CNA CVSS-BT Score: 🔍
CNA Vector: 🔍

CVSSv3info

VulDB Meta Base Score: 4.6
VulDB Meta Temp Score: 4.6

VulDB Base Score: 3.1
VulDB Temp Score: 3.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.1
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper neutralization of http headers for scripting syntax
CWE: CWE-644
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

04/16/2025 🔍
05/16/2025 +30 days 🔍
05/16/2025 +0 days 🔍
10/10/2025 +146 days 🔍

Sourcesinfo

Advisory: incibe.es
Researcher: B3xal
Status: Not defined

CVE: CVE-2025-40631 (🔍)
GCVE (CVE): GCVE-0-2025-40631
GCVE (VulDB): GCVE-100-309279

Entryinfo

Created: 05/16/2025 15:02
Updated: 10/10/2025 00:25
Changes: 05/16/2025 15:02 (67), 10/10/2025 00:25 (12)
Complete: 🔍
Cache ID: 216::103