Security readout for executives and security teams
Plain-English summary
CVE-2026-1685 affects the D-Link DIR-823X firmware version 250416. It weakens protection against repeated login attempts, potentially helping an attacker keep trying credentials remotely. The reported impact is limited, exploitation is described as difficult, and the CVSS score is 6.3. Public exploit material is referenced, but active exploitation is not confirmed.
Executive priority
Treat this as a moderate-priority network edge risk. Prioritize devices with exposed administration interfaces. The main business concern is increased opportunity for credential guessing against router login pages, not confirmed widespread compromise.
Technical view
The issue is an improper restriction of excessive authentication attempts in the Login component, function sub_40AC74, mapped to CWE-307 and CWE-799. It is remotely reachable, requires no privileges or user interaction, and has high attack complexity. Reported impact is low confidentiality loss only, with no integrity or availability impact stated.
Likely exposure
Organizations using D-Link DIR-823X devices running firmware 250416 are potentially exposed, especially if the management/login interface is reachable from untrusted networks. The provided sources do not identify other affected models or firmware versions.
Exploitation context
The source bundle says exploit code is publicly available and might be used. However, CISA KEV status is false, and no cited source confirms active exploitation. Remote exploitation is possible but described as high complexity and difficult.
Researcher notes
Evidence is mainly from CVE/VulDB records and a referenced GitHub issue. No vendor advisory or patch details are included in the provided sources. Avoid broad product assumptions beyond DIR-823X firmware 250416.
Mitigation direction
- Identify any D-Link DIR-823X devices running firmware 250416.
- Restrict router management access to trusted administrative networks only.
- Do not expose the login interface directly to the internet.
- Use strong, unique administrator credentials.
- Monitor for repeated failed login attempts.
- Check D-Link guidance for firmware updates or official mitigations.
Validation and detection
- Inventory D-Link DIR-823X devices and record firmware versions.
- Confirm whether firmware version 250416 is present.
- Verify management interfaces are not reachable from untrusted networks.
- Review authentication logs for repeated failed login patterns.
- Track CVE, VulDB, and D-Link pages for updated remediation 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-307: 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 lookupCWE-799: 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-2026-1685 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
- 6.3 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
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.
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:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
6.3MediumVector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
Source materials
- CVE List V5 sourceCVE List V5
- VDB-343479 | D-Link DIR-823X Login sub_40AC74 excessive authenticationCVE reference · vdb-entry, technical-description
- VDB-343479 | CTI Indicators (IOB, IOC, TTP, IOA)CVE reference · signature, permissions-required
- Submit #740886 | D-Link dir-823X 250416 A logical flaw in the authentication mechanism existsCVE reference · third-party-advisory
- https://github.com/master-abc/cve/issues/17CVE reference · exploit, issue-tracking
- https://www.dlink.com/CVE reference · 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 Restriction of Excessive Authentication Attempts
Improper Restriction of Excessive Authentication Attempts represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Improper Control of Interaction Frequency
Improper Control of Interaction Frequency represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.