Security readout for executives and security teams
Plain-English summary
This CVE describes a critical memory-corruption flaw in a Tenda W20E router firmware build. A network attacker may be able to compromise an affected device without authentication or user interaction. The source bundle does not identify a vendor patch, CPE record, or active exploitation evidence.
Executive priority
Prioritize remediation or exposure reduction for any affected router, especially internet-facing or branch-office devices. A compromised edge router can affect traffic control, availability, and network trust. Evidence of active exploitation is not provided, but the unauthenticated critical rating warrants urgent handling.
Technical view
CVE-2022-40867 is reported as a stack overflow in Tenda W20E firmware V15.11.0.6, specifically the formIPMacBindDel function handling /goform/delIpMacBind/. It is mapped to CWE-787 and scored CVSS 3.1 9.8, indicating network access, low complexity, no privileges, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure appears limited to Tenda W20E routers running the named V15.11.0.6 firmware build. Risk is highest where the router management interface is reachable from untrusted networks. The source bundle provides no CPEs or broader affected-version range.
Exploitation context
The bundle includes a public GitHub vulnerability reference, but CISA KEV status is false and no cited source confirms active exploitation. Treat this as high-priority because the CVSS vector indicates unauthenticated network attack potential, not because exploitation is proven.
Researcher notes
The public record names one firmware build and function path but lacks CPEs, patch status, and vendor remediation detail. Avoid broad product claims beyond Tenda W20E V15.11.0.6 unless verified separately. Do not treat KEV=false as proof of no exploitation.
Mitigation direction
- Inventory Tenda W20E devices and record firmware versions.
- Check Tenda guidance for fixed firmware or replacement advice.
- Remove public exposure of router management interfaces.
- Restrict management access to trusted admin networks only.
- Replace affected devices if no supported fix is available.
Validation and detection
- Confirm whether any Tenda W20E runs firmware V15.11.0.6.
- Check whether /goform/delIpMacBind/ is reachable from untrusted networks.
- Review firewall rules controlling router administration access.
- Verify vendor advisories before claiming remediation is complete.
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-787: 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 lookupCVE-2022-40867 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
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/CPSeek/Router-vuls/blob/main/Tenda/W20E/formIPMacBindDel.mdCVE 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.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.