Security readout for executives and security teams
Plain-English summary
CVE-2020-25366 is a denial-of-service issue in D-Link DIR-823G REVA1 firmware version 1.02B05. The reported vulnerable component is the firmware upload CGI endpoint. Successful exploitation could make the router unavailable or unstable. Public sources do not provide a CVSS score, confirmed patch, or evidence of active exploitation.
Executive priority
Prioritize if these routers are internet-facing, support critical connectivity, or are unmanaged. For internal-only devices with restricted administration, handle through normal network hardening and lifecycle management. The main business impact is service disruption, not confirmed data theft.
Technical view
The CVE record describes a DoS condition in /cgi-bin/upload_firmware.cgi on D-Link DIR-823G REVA1 1.02B05, triggered by unspecified vectors. The issue appears tied to the firmware upload handler. No CWE, CVSS vector, authentication requirement, or fixed version is provided in the source bundle.
Likely exposure
Exposure is most relevant where DIR-823G REVA1 devices running 1.02B05 are deployed, especially if the management interface is reachable by untrusted users or networks. Internet-exposed administration would raise business risk, but the sources do not confirm remote unauthenticated exploitability.
Exploitation context
A public GitHub reference exists for the reported DoS, but the CVE is not listed in CISA KEV and the provided sources do not state active exploitation. Treat this as a publicly disclosed router availability risk rather than confirmed in-the-wild exploitation.
Researcher notes
Key missing details include CVSS, CWE, authentication requirements, exact trigger conditions, and vendor-fixed version. Avoid assuming broader DIR-823G revisions are affected unless confirmed. The GitHub reference may contain technical reproduction detail, but operational validation should remain controlled and authorized.
Mitigation direction
- Identify any D-Link DIR-823G REVA1 devices and their firmware versions.
- Restrict router management access to trusted administrative networks only.
- Disable remote administration if it is not required.
- Check D-Link security bulletins and support channels for applicable firmware guidance.
- Replace or retire affected devices if no vendor-supported fix is available.
Validation and detection
- Inventory network devices for D-Link DIR-823G REVA1 hardware.
- Confirm whether firmware version 1.02B05 is installed.
- Verify management interfaces are not exposed to the internet.
- Review firewall rules limiting access to router administration services.
- Monitor affected devices for unexplained reboots, hangs, or management instability.
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
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CVE-2020-25366 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
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.dlink.com/en/security-bulletin/CVE reference, mitre
- https://github.com/sek1th/iot/blob/master/dir823g_upfw_dos.mdCVE reference, mitre
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.