Security readout for executives and security teams
Plain-English summary
CVE-2022-40862 is a critical memory-safety flaw in Tenda AC15 and AC18 routers running firmware V15.03.05.19. The CVE says an unauthenticated network attacker could affect confidentiality, integrity, and availability. Treat exposed affected routers as urgent edge-device risk.
Executive priority
Prioritize this as a critical perimeter-device issue if affected Tenda routers are present. The main decision is whether the organization has exposed AC15 or AC18 devices on the vulnerable firmware and whether a vendor-supported remediation path exists.
Technical view
The issue is described as a stack overflow in fromNatStaticSetting, reachable through /goform/NatStaticSetting. It is classified as CWE-787 with CVSS 3.1 score 9.8: network reachable, low complexity, no privileges, no user interaction, and high CIA impact.
Likely exposure
Exposure is most likely where Tenda AC15 or AC18 routers on V15.03.05.19 expose their web management surface to untrusted networks. The CVE record does not provide CPEs or a patched version.
Exploitation context
The source bundle does not establish active exploitation, and the CVE is not marked KEV. Public researcher references are listed, but this analysis should not assume in-the-wild exploitation from the provided evidence alone.
Researcher notes
Evidence is narrow but serious: CVE text names AC15, AC18, firmware V15.03.05.19, fromNatStaticSetting, and /goform/NatStaticSetting. Affected CPE data is not populated, and no patch information is included in the provided sources.
Mitigation direction
- Inventory Tenda AC15 and AC18 routers and identify firmware V15.03.05.19.
- Check Tenda guidance for fixed firmware; sources do not name a patched version.
- Restrict router web administration access to trusted management networks only.
- Remove or replace affected routers if no vendor-supported fix is available.
- Monitor for unexpected access attempts to /goform/NatStaticSetting.
Validation and detection
- Confirm model and firmware version from asset inventory or device administration records.
- Verify whether the router web interface is reachable from untrusted networks.
- Review vendor advisories or firmware release notes for a fixed build.
- Check logs for unusual requests to /goform/NatStaticSetting without replaying payloads.
- Document compensating controls for any device that cannot be updated.
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-2022-40862 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/AC15/fromNatStaticSetting.mdCVE reference · x_refsource_MISC
- https://github.com/CPSeek/Router-vuls/blob/main/Tenda/AC18/fromNatStaticSetting.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.