Security readout for executives and security teams
Plain-English summary
This is an account discovery flaw in D-Link Nuclias Connect. A reachable login page can reveal whether a username exists because it returns different JSON error messages. That does not grant access by itself, but it helps attackers target valid accounts. D-Link says a fix is under development.
Executive priority
Handle in the normal vulnerability cycle, but accelerate if Nuclias Connect is internet-facing or protects critical wireless infrastructure. The issue mainly increases the effectiveness of password attacks against known accounts.
Technical view
Nuclias Connect versions <=1.3.1.4 have an observable response discrepancy at the Login endpoint. Unauthenticated remote requests receive different error.message values depending on username validity. The weakness is CWE-204, with CVSS 4.0 score 6.9 for low-complexity remote information disclosure without integrity or availability impact.
Likely exposure
Organizations running D-Link Nuclias Connect <=1.3.1.4 are most exposed when the login interface is reachable from untrusted networks. The source bundle’s affected-version metadata is sparse, so confirm exact product and version against D-Link’s advisory.
Exploitation context
The provided sources support unauthenticated remote account enumeration. They do not show active exploitation, and the CVE is not listed as KEV in the bundle. Treat this as a credential-attack enabler, not a direct system compromise.
Researcher notes
Evidence indicates CWE-204 observable response discrepancy in Login JSON error.message handling. No exploit code, patch details, or confirmed exploitation are included in the source bundle. D-Link’s stated fix status is under development.
Mitigation direction
- Check D-Link SAP10472 for current vendor guidance and fix availability.
- Restrict Nuclias Connect login access to trusted management networks or VPN users.
- Reduce exposed administrative surfaces on the internet wherever possible.
- Monitor authentication logs for username probing and repeated login failures.
- Prioritize strong passwords and MFA where supported by the deployment.
Validation and detection
- Inventory Nuclias Connect deployments and record exact running versions.
- Confirm whether any login interfaces are reachable from untrusted networks.
- Review D-Link advisory SAP10472 and VulnCheck advisory for affected-version details.
- In authorized testing, check whether login errors disclose username validity.
- Review logs for repeated failed attempts across many usernames.
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-204: 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-2025-34254 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
- 6.9 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA: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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
6.9MediumVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA: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.vulncheck.com/advisories/dlink-nuclias-connect-login-account-enumerationCVE reference, VulnCheck · third-party-advisory
- https://www.dlink.com/en/for-business/nuclias/nuclias-connectCVE reference, VulnCheck · product
- https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10472CVE reference, VulnCheck · vendor-advisory
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.
Observable Response Discrepancy
Observable Response Discrepancy represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.