Security readout for executives and security teams
Plain-English summary
CVE-2021-34827 affects D-Link DAP-1330 routers running firmware 1.13B01 BETA. An attacker on an adjacent network can exploit a vulnerable HTTP header handling flaw without logging in, potentially taking control of the device. The source bundle does not identify a vendor patch or active exploitation.
Executive priority
Treat this as high priority where affected DAP-1330 devices are deployed. The business risk is device takeover from nearby networks without credentials. Scope should be confirmed first because sources name only one model and beta firmware version.
Technical view
The flaw is a stack-based buffer overflow in handling of the SOAPAction HTTP header. User-supplied data is copied into a fixed-length stack buffer without proper length validation. CVSS 3.0 is 8.8, with adjacent-network access, low complexity, no privileges, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure appears limited to D-Link DAP-1330 devices running 1.13B01 BETA firmware and reachable by network-adjacent attackers, such as users on nearby LAN or Wi-Fi segments. Evidence does not support broader product impact.
Exploitation context
ZDI and CVE sources describe unauthenticated arbitrary code execution from an adjacent network. CISA KEV status is false in the provided bundle, and no cited source confirms active exploitation.
Researcher notes
The evidence is specific: D-Link DAP-1330 1.13B01 BETA, SOAPAction HTTP header, CWE-121 stack overflow, ZDI-CAN-12029. Avoid extrapolating to other D-Link models or firmware without additional vendor evidence.
Mitigation direction
- Inventory D-Link DAP-1330 devices and identify firmware versions.
- Check D-Link guidance for fixed firmware, replacement, or retirement advice.
- Remove 1.13B01 BETA firmware from production where feasible.
- Restrict device management exposure to trusted network segments only.
- Isolate affected devices from guest, public, or untrusted Wi-Fi networks.
Validation and detection
- Confirm whether any D-Link DAP-1330 runs firmware 1.13B01 BETA.
- Verify HTTP or SOAP management interfaces are not reachable from untrusted adjacent networks.
- Review asset records for beta firmware use in production environments.
- Check vendor advisories before assuming a patch or workaround exists.
- Monitor affected device segments for unexpected management-interface activity.
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-121: 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 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-2021-34827 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
- High
- CVSS
- 8.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
8.8HighVector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.zerodayinitiative.com/advisories/ZDI-21-679/CVE 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.