Security readout for executives and security teams
Plain-English summary
HotelRunner B2B releases before 4 June 2025 may insufficiently validate host identity, potentially enabling manipulated HTTP responses. A successful attack could expose or alter limited information, but requires low-level privileges and user interaction. Availability is not affected according to the CVSS assessment.
Executive priority
Prioritize routine remediation and verification, especially where B2B interfaces are externally reachable or handle sensitive transactions. Escalate if HotelRunner confirms an affected revision or monitoring identifies suspicious behavior. Current evidence does not justify emergency incident status.
Technical view
CVE-2025-4295 is classified as CWE-297 and described as improper certificate host-mismatch validation allowing HTTP response splitting. CVSS 3.1 is 4.6 (AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N). The supplied title says host header injection, creating ambiguity about the precise root cause.
Likely exposure
Potential exposure is limited to HotelRunner B2B versions before 4 June 2025. The record's version data is imprecise, listing version “0” with a default unaffected status. Organizations should confirm their deployment or service revision directly with HotelRunner.
Exploitation context
No active exploitation is established: the CVE is not listed as KEV in the supplied bundle, and no cited source claims exploitation. The CVSS vector indicates remote reachability, low complexity, required low privileges, and required user interaction.
Researcher notes
The record contains terminology inconsistencies: the title references host header injection, while the description cites certificate host mismatch and HTTP response splitting. CWE-297 supports certificate host-mismatch validation, but technical mechanics are not documented. Avoid assuming a specific injection path without vendor evidence.
Mitigation direction
- Confirm with HotelRunner that B2B is running a release dated 4 June 2025 or later.
- Review current HotelRunner security guidance for the vendor-supported remediation.
- Restrict unnecessary access to affected B2B interfaces until remediation is confirmed.
- Monitor application and proxy logs for suspicious host values or malformed response behavior.
Validation and detection
- Inventory HotelRunner B2B instances and record their exact release or service revision.
- Verify each instance is not running a release from before 4 June 2025.
- Confirm remediation status with HotelRunner where local version evidence is unavailable.
- Review authorized test results for host validation and HTTP response-boundary handling.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-297: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2025-4295 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N2.12.5TR-CERTVulnerability scoring details
Base CVSS 3.1 score
4.6MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://www.usom.gov.tr/bildirim/tr-25-0169CVE reference, TR-CERT · government-resource, broken-link
- https://siberguvenlik.gov.tr/guvenlik-bildirimleri/detay/tr-25-0169CVE reference, TR-CERT · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Validation of Certificate with Host Mismatch
Improper Validation of Certificate with Host Mismatch represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.