Security readout for executives and security teams
Plain-English summary
This issue lets an unauthenticated remote person learn whether an email address belongs to a Nuclias Connect account by using the forgot-password flow. It does not provide passwords or direct system access, but it can help attackers target phishing, credential stuffing, or follow-on login attacks.
Executive priority
Treat this as a moderate identity-exposure issue. Prioritize externally reachable Nuclias Connect systems, especially where administrative email addresses are sensitive or reused across other services.
Technical view
CVE-2025-34255 is a CWE-204 observable response discrepancy in D-Link Nuclias Connect <= v1.3.1.4. The forgot-password endpoint returns different JSON values for existing versus non-existing accounts, specifically through the data.exist boolean. CVSS v4.0 is 6.9 medium.
Likely exposure
Exposure is most relevant where Nuclias Connect is deployed and its forgot-password function is reachable from untrusted networks. The provided affected metadata is inconsistent, so validate actual product version and exposure against D-Link and VulnCheck guidance.
Exploitation context
The source bundle says exploitation is unauthenticated, remote, low complexity, and requires no user interaction. KEV is false, and the provided sources do not state active exploitation in the wild.
Researcher notes
Evidence supports account enumeration, not authentication bypass or code execution. The bundle notes D-Link says a fix is under development. The affected-version metadata includes an inconsistency, so researchers should verify scope against the vendor advisory and VulnCheck before reporting exposure.
Mitigation direction
- Monitor D-Link SAP10472 and apply the vendor fix when released.
- Restrict internet access to Nuclias Connect administration interfaces where feasible.
- Review accounts and remove unused email addresses from exposed deployments.
- Monitor for abnormal forgot-password request volume or broad address probing.
Validation and detection
- Inventory Nuclias Connect deployments and identify versions <= 1.3.1.4.
- Confirm whether the forgot-password workflow is reachable from untrusted networks.
- Check D-Link SAP10472 for current fixed-version guidance.
- Review logs for repeated forgot-password attempts across many email addresses.
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 lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2025-34255 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-forgot-password-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.