Security readout for executives and security teams
Plain-English summary
D-Link Nuclias Connect versions before 1.3.1.4 can let a logged-in attacker delete files outside the intended backup area. This can disrupt management services or damage system integrity. The issue requires authentication, but the impact is high because file deletion can affect availability.
Executive priority
Treat this as a high-priority patching item for environments using Nuclias Connect. The issue is not confirmed exploited in the provided sources, but authenticated file deletion can interrupt network management operations.
Technical view
CVE-2025-34248 is a CWE-22 directory traversal flaw in /api/web/dnc/global/database/deleteBackup. Improper sanitization of the deleteBackupList parameter allows an authenticated, low-privilege network attacker to delete arbitrary files. CVSS v4.0 score is 7.2 high, with high integrity and availability impact.
Likely exposure
Exposure is most likely where D-Link Nuclias Connect is deployed below v1.3.1.4 and its management/API interface is reachable by users beyond tightly trusted administrators.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. Exploitation requires authentication, but no user interaction, and targets an API path tied to backup deletion.
Researcher notes
The advisory states affected versions are below 1.3.1.4, but the structured affected entry in the bundle lists version "0" with defaultStatus "unaffected". Use vendor SAP10472 as the authoritative remediation reference and avoid assuming broader product impact.
Mitigation direction
- Upgrade Nuclias Connect to v1.3.1.4 or later per D-Link guidance.
- Follow D-Link SAP10472 for official remediation instructions.
- Restrict Nuclias Connect management/API access to trusted networks or VPN.
- Review and reduce accounts with Nuclias Connect administrative access.
- Monitor for service instability or unexpected file deletion symptoms.
Validation and detection
- Inventory all Nuclias Connect deployments and record installed versions.
- Compare installed versions against D-Link SAP10472 and the CVE record.
- Confirm management/API interfaces are not exposed to untrusted networks.
- Review logs for authenticated backup deletion requests and related failures.
- Verify backups and recovery procedures for affected management systems.
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-22: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. 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 lookupDatabase behavior lookup
The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2025-34248 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
- High
- CVSS
- 7.2 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/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:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
7.2HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/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-directory-traversal-to-arbitrary-file-deletionCVE 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, patch
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 Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.