Security readout for executives and security teams
Plain-English summary
This CVE describes a crash flaw in the web server component of several D-Link DAP wireless access points. A specially crafted network packet can cause the device's httpd process to crash. The available sources do not provide a CVSS score, patch version, or evidence of active exploitation.
Executive priority
Treat this as a targeted availability risk for legacy D-Link access points, not a confirmed critical breach vector. Prioritize asset discovery and management-interface exposure review, then follow vendor guidance when available.
Technical view
The issue is a null pointer dereference in sbin/httpd across listed D-Link DAP firmware versions. The crash occurs during an atoi operation after a specific network package reaches httpd. The sources establish a crash condition, but not code execution, authentication requirements, reachability, or full device impact.
Likely exposure
Exposure is most likely where listed D-Link DAP access points run the named firmware versions and their web management/httpd service is reachable from untrusted networks. The provided CVE metadata lists affected models, but does not provide CPEs or deployment prevalence.
Exploitation context
CISA KEV is false in the supplied bundle, and no cited source states active exploitation. Public references include D-Link's security bulletin page and researcher correspondence PDFs, but the bundle does not include exploit maturity, required privileges, or attack complexity details.
Researcher notes
The record lacks CVSS, CWE assignment, exploit status, and patch details. Analysis should stay limited to null pointer dereference and crash behavior in httpd. Do not infer remote code execution or a specific fixed firmware without additional vendor evidence.
Mitigation direction
- Inventory listed D-Link DAP models and firmware versions in your environment.
- Check D-Link's security bulletin for vendor-confirmed firmware guidance.
- Reduce exposure of web management interfaces pending confirmed remediation.
- Monitor affected devices for unexpected httpd crashes or management outages.
Validation and detection
- Confirm whether any listed DAP model and firmware version is deployed.
- Verify whether httpd/web management is reachable from user or internet-facing networks.
- Review device logs or monitoring for recurring web service crashes.
- Track D-Link advisories for patch or lifecycle status evidence.
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-2021-28838 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://www.dlink.com/en/security-bulletin/CVE reference · x_refsource_MISC
- https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve.pdfCVE reference · x_refsource_MISC
- https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve2.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.