Security readout for executives and security teams
Plain-English summary
Mender Client 5 versions before 5.0.4 have a signature verification bypass. In business terms, a security control intended to validate trusted signed content can be bypassed, creating exposure in affected Mender-managed deployments. The public record rates this medium severity, and the provided sources do not show known active exploitation.
Executive priority
Treat this as a moderate-priority patching issue for Mender Client 5 fleets. It affects a trust mechanism, but public scoring shows limited confidentiality impact and the supplied evidence does not indicate active exploitation.
Technical view
CVE-2025-67903 is a CWE-347 improper cryptographic signature verification issue in Northern.tech Mender Client 5 before 5.0.4. The CVSS 3.1 vector is AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N, indicating unauthenticated network reachability with low attack complexity and limited confidentiality impact in the published scoring.
Likely exposure
Exposure is limited to environments running Northern.tech Mender Client 5 versions earlier than 5.0.4. The source bundle does not provide CPEs, platform details, deployment prerequisites, or a complete affected-version matrix beyond the before-5.0.4 statement.
Exploitation context
The CVE is not listed as KEV in the supplied data, and no cited source in the bundle states active exploitation. The CVSS vector indicates remote, unauthenticated attack conditions, but the bundle does not include exploit details, proof-of-concept status, or observed threat activity.
Researcher notes
The public metadata is sparse: affected vendor/product fields are marked n/a, while the title and description identify Mender Client 5 before 5.0.4. Avoid expanding scope beyond that. Track the Northern.tech advisory for precise technical details and any later correction to affected-version data.
Mitigation direction
- Upgrade Mender Client 5 deployments to version 5.0.4 or later.
- Review Northern.tech's advisory for vendor-specific upgrade and mitigation guidance.
- Inventory device fleets for Mender Client 5 installations below 5.0.4.
- Prioritize externally reachable or centrally managed deployments for remediation.
Validation and detection
- Confirm installed Mender Client versions across managed systems.
- Verify affected systems are upgraded to 5.0.4 or later.
- Check vendor advisory updates for newly clarified affected versions or workarounds.
- Review logs for unusual update or signature-validation related failures.
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-347: 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-2025-67903 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
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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:N/UI:N/S:U/C:L/I:N/A:N3.91.4CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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://northern.tech/CVE reference, mitre
- https://mender.io/blog/cve-2025-67903-signature-verification-bypass-in-mender-clientCVE reference, mitre
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 Verification of Cryptographic Signature
Improper Verification of Cryptographic Signature represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.