Security readout for executives and security teams
Plain-English summary
This CVE describes a crash-style vulnerability in a Tenda AC series router firmware build. Crafted overflow data sent to the PPPoE module can cause denial of service. The public record does not provide CVSS, confirmed patch status, authentication requirements, or active exploitation evidence.
Executive priority
Treat this as a moderate operational availability risk for affected routers. Prioritize sites depending on PPPoE connectivity or unsupported Tenda hardware, but avoid emergency escalation unless exposure or exploitation evidence emerges.
Technical view
CVE-2021-46262 is reported as a stack buffer overflow in the PPPoE module of Tenda AC11_V02.03.01.104_CN. The stated impact is denial of service from crafted overflow data. Public metadata lacks CWE, CPE, CVSS, detailed affected-version mapping, and remediation information.
Likely exposure
Exposure is most plausible where the named Tenda AC11 Chinese firmware build is deployed and PPPoE processing is reachable. The source bundle does not confirm internet reachability, authentication requirements, or whether other Tenda AC models are affected.
Exploitation context
The CVE record does not indicate CISA KEV listing or active exploitation. A public GitHub reference exists, but the provided bundle only supports a denial-of-service impact, not code execution or exploitation in the wild.
Researcher notes
The public record is thin: no CVSS vector, CWE, CPE, patch detail, or exploit-in-the-wild evidence is included. Analysis should stay constrained to the named firmware and DoS impact unless vendor or primary research confirms broader scope.
Mitigation direction
- Inventory Tenda AC11 devices and firmware versions.
- Check Tenda or reseller guidance for fixed firmware.
- Replace or retire devices without supported updates.
- Limit untrusted access to router-facing network services.
- Monitor affected routers for unexplained crashes or reboots.
Validation and detection
- Confirm whether AC11_V02.03.01.104_CN is deployed.
- Review router logs for PPPoE-related instability.
- Verify PPPoE exposure from untrusted network segments.
- Check vendor advisories for firmware remediation status.
- Document compensating controls for unsupported devices.
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-2021-46262 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/Ainevsia/CVE-Request/tree/main/Tenda/7CVE 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.