Security readout for executives and security teams
Plain-English summary
CVE-2021-34202 describes multiple out-of-bounds flaws in D-Link AC2600 DIR-2640 firmware 1.01B04. The reported impact is serious: a low-privileged user could become administrator and run code locally. The source also says remote code execution may be possible when combined with other vulnerabilities.
Executive priority
Prioritize review where DIR-2640 devices support business networks or remote sites. The impact is high, but urgency depends on confirmed deployment, firmware version, and whether attackers can reach or chain into the device.
Technical view
The CVE record reports multiple out-of-bounds vulnerabilities in some DIR-2640 1.01B04 processes, enabling ordinary permissions to escalate to administrator permissions and resulting in local arbitrary code execution. Remote code execution is described only as a chained outcome with other vulnerabilities, not as a standalone confirmed condition.
Likely exposure
Exposure appears limited to environments using D-Link AC2600 DIR-2640 devices on firmware 1.01B04. The supplied affected-product metadata is incomplete, so asset inventory should verify model and firmware directly.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. A public GitHub reference exists, but the supplied evidence does not establish real-world exploitation. Local access or prior compromise appears relevant unless chained with another vulnerability.
Researcher notes
The public record is sparse: no CVSS, CWE, complete affected metadata, or named fixed version is provided in the bundle. Treat the GitHub reference as public technical context, but avoid assuming exploit maturity without reviewing cited material directly.
Mitigation direction
- Check D-Link security bulletins for firmware guidance for DIR-2640 1.01B04.
- Inventory D-Link DIR-2640 devices and record exact firmware versions.
- Upgrade, replace, or isolate affected devices according to vendor guidance.
- Restrict device administration to trusted management networks only.
- Monitor affected devices for unexpected administrative changes or process behavior.
Validation and detection
- Confirm whether any D-Link AC2600 DIR-2640 devices are deployed.
- Verify firmware version against 1.01B04 on each device.
- Review D-Link advisories for matching remediation or lifecycle status.
- Check whether device management interfaces are reachable from untrusted networks.
- Review logs for unexpected privilege changes or administrative 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.
Execution 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-2021-34202 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.
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/liyansong2018/CVE/tree/main/2021/CVE-2021-34202CVE 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.