Security readout for executives and security teams
Plain-English summary
A remotely reachable flaw in the D-Link DNS-340L can let a low-privileged authenticated user execute operating-system commands. Successful exploitation could expose stored data, alter the device, or disrupt availability. A public exploit is reported, increasing urgency, but the supplied sources do not establish active exploitation.
Executive priority
Treat as an immediate priority where firmware 1.01B04 is deployed, especially on internet-facing or shared networks. Isolate exposure, restrict accounts, and obtain vendor remediation guidance. Accelerate replacement planning if no supported fix exists.
Technical view
CVE-2026-85223 affects DNS-340L firmware 1.01B04. Improper handling of callback_url or sync_interval by /cgi-bin/dropbox.cgi permits OS command injection. CVSS 3.1 rates it 9.9: network-accessible, low complexity, low privileges, no user interaction, changed scope, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to D-Link DNS-340L devices running firmware 1.01B04 where a low-privileged authenticated user can reach the affected CGI handler. Internet-accessible or broadly reachable administration interfaces create the greatest concern. The bundle does not identify other affected versions.
Exploitation context
A public exploit reference is reported, so practical exploitation knowledge may be available. The supplied bundle marks KEV false and provides no evidence of active exploitation. Authentication with low privileges is indicated by the CVSS vector; no user interaction is required.
Researcher notes
The reported injection points are callback_url and sync_interval in /cgi-bin/dropbox.cgi. CWE-77 and CWE-78 apply. Public exploit availability is reported, but the bundle does not provide vendor confirmation, an official patch, detection signatures, or evidence of exploitation in the wild. Validate defensively without executing payloads.
Mitigation direction
- Identify DNS-340L devices and confirm their installed firmware versions.
- Remove affected management or CGI interfaces from direct internet exposure.
- Restrict device access to trusted administrative networks and authorized accounts.
- Review low-privileged accounts and revoke unnecessary access immediately.
- Check D-Link guidance for an official update or mitigation; none is named here.
- Consider replacing affected devices if supported remediation is unavailable.
Validation and detection
- Inventory D-Link DNS-340L devices across internal and externally facing networks.
- Verify whether each device runs firmware 1.01B04.
- Confirm untrusted networks cannot reach the affected CGI interface.
- Review authentication and web logs for unusual access to dropbox.cgi.
- Check device configurations and stored data for unexplained changes.
- Monitor D-Link and the CVE record for updated remediation or affected-version details.
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-77: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter 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 lookupCWE-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-85223 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
- Critical
- CVSS
- 9.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R
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
4 official scoresWe 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:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R3.16VulDBCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R3.16VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P——VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR810VulDBVulnerability scoring details
Base CVSS 4.0 score
9.4CriticalVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
Base CVSS 3.1 score
9.9CriticalVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R
Base CVSS 3.0 score
9.9CriticalVector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R
Base CVSS 2.0 score
9CriticalVector: AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- Source timelineVulDB
Advisory disclosed
- Source timelineVulDB
VulDB entry created
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- Source timelineVulDB
VulDB entry last update
- 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
- VDB-398422 | D-Link DNS-340L CGI dropbox.cgi os command injectionCVE reference, VulDB · vdb-entry, technical-description
- VDB-398422 | CTI Indicators (IOB, IOC, TTP, IOA)CVE reference, VulDB · signature, permissions-required
- CVE-2026-85223 | CVE Analysis and ReportCVE reference, VulDB · third-party-advisory
- Submit #894213 | D-Link DNS-340L ShareCenter confirmed DNS-340L firmware builds OS Command InjectionCVE reference, VulDB · third-party-advisory
- https://github.com/dxz0069/WAVLINK-WN530H4-Command-Injection-in-set_add_routing/blob/main/DLINK-CMD-008-vulndb.mdCVE reference, VulDB · exploit
- https://www.dlink.com/CVE reference, VulDB · product
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 Neutralization of Special Elements used in a Command ('Command Injection')
Improper Neutralization of Special Elements used in a Command ('Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.