HotelRunner B2B up to 03.06.2025 Host certificate host validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.8$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in HotelRunner B2B up to 03.06.2025. Affected is an unknown function. This manipulation of the argument Host causes certificate host validation. The identification of this vulnerability is CVE-2025-4295. It is possible to initiate the attack remotely. There is no exploit available. This product is a managed service. This means that users cannot maintain vulnerability countermeasures themselves.

Detailsinfo

A vulnerability was found in HotelRunner B2B up to 03.06.2025. It has been declared as critical. Affected by this vulnerability is some unknown processing. The manipulation of the argument Host with an unknown input leads to a certificate host validation vulnerability. The CWE definition for the vulnerability is CWE-297. The product communicates with a host that provides a certificate, but the product does not properly ensure that the certificate is actually associated with that host. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Improper Validation of Certificate with Host Mismatch vulnerability in HotelRunner B2B allows HTTP Response Splitting. This issue affects B2B: before 04.06.2025.

The weakness was shared by Berat Arslan. It is possible to read the advisory at usom.gov.tr. This vulnerability is known as CVE-2025-4295 since 05/05/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1587.003 according to MITRE ATT&CK.

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Productinfo

Type

Vendor

Name

Version

Managed Service

  • yes

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.8

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 4.6
CNA Vector (TR-CERT): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Certificate host validation
CWE: CWE-297 / CWE-295 / CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Status: 🔍

0-Day Time: 🔒

Timelineinfo

05/05/2025 CVE reserved
07/22/2025 +78 days Advisory disclosed
07/22/2025 +0 days VulDB entry created
06/06/2026 +319 days VulDB entry last update

Sourcesinfo

Advisory: usom.gov.tr
Researcher: Berat Arslan
Status: Confirmed

CVE: CVE-2025-4295 (🔒)
GCVE (CVE): GCVE-0-2025-4295
GCVE (VulDB): GCVE-100-317239

Entryinfo

Created: 07/22/2025 16:58
Updated: 06/06/2026 04:21
Changes: 07/22/2025 16:58 (65), 07/26/2025 04:15 (6), 06/06/2026 04:21 (2)
Complete: 🔍
Cache ID: 216::103

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