Security readout for executives and security teams
Plain-English summary
This CVE describes a denial-of-service flaw in specific TRENDnet wireless access point firmware. A remote attacker could crash affected device software by sending a malformed management request. The public sources do not provide CVSS scoring, confirmed exploitation, or a named fixed firmware version.
Executive priority
Treat this as a targeted availability risk for affected wireless infrastructure, not as confirmed active exploitation. Prioritize exposed or business-critical access points first.
Technical view
CVE-2021-28845 is a null pointer dereference affecting TRENDnet TEW-755AP, TEW-755AP2KAC, TEW-821DAP2KAC, and TEW-825DAP firmware version 1.11B03. The described condition is triggered through the web management apply_cgi language action when a required language key is absent, resulting in denial of service.
Likely exposure
Exposure is most relevant where the listed TRENDnet access points run firmware 1.11B03 and their web management interface is reachable by untrusted users or networks.
Exploitation context
The source bundle says a remote malicious user could cause denial of service. It does not show CISA KEV listing, active exploitation, public exploit maturity, authentication requirements, or patch status.
Researcher notes
Evidence is sparse: CVE metadata names affected models, firmware, request path context, and denial-of-service outcome, but lacks CVSS, CWE mapping, authentication detail, and vendor remediation information.
Mitigation direction
- Inventory the named TRENDnet models and firmware versions.
- Check TRENDnet guidance for fixed firmware or official mitigations.
- Restrict management interfaces to trusted administrative networks.
- Disable remote management exposure where operationally possible.
- Plan replacement if unsupported devices cannot be safely updated.
Validation and detection
- Confirm whether any listed model runs firmware 1.11B03.
- Verify management interfaces are not internet exposed.
- Review monitoring for unexplained access point crashes or reboots.
- Track vendor or CVE record updates for 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.
CVE-2021-28845 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
- 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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/zyw-200/EQUAFL/blob/main/TRENDnet%20ticket.pdfCVE reference · x_refsource_MISC
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.