Security readout for executives and security teams
Plain-English summary
CVE-2022-40861 is a high-severity memory corruption issue reported in Tenda AC18 router firmware V15.03.05.19. An authenticated, high-privilege network attacker could potentially crash the device or affect confidentiality, integrity, and availability. The sources do not name a vendor patch or confirmed exploitation.
Executive priority
Prioritize affected routers in business networks, especially if management access is exposed outside trusted administration paths. This is not KEV-listed, but the potential impact is complete device compromise once high privileges are obtained.
Technical view
The CVE describes a stack overflow, mapped to CWE-787, in formSetQosBand->FUN_0007db78 when handling /goform/SetNetControlList. CVSS 3.1 is 7.2 with AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H, meaning network reachability and high privileges are required.
Likely exposure
Exposure appears limited to Tenda AC18 devices running firmware V15.03.05.19 where the management interface is reachable by authenticated administrators. Risk increases if router administration is exposed beyond a trusted management network or if admin credentials are weak or compromised.
Exploitation context
CISA KEV is false in the provided bundle. The public references include a GitHub vulnerability report, but the supplied evidence does not establish active exploitation, weaponized tooling, or a vendor-confirmed fix.
Researcher notes
Evidence is sparse and primarily CVE metadata plus a public GitHub report. The CVSS vector requires high privileges, so validation should focus on asset identification, management-plane exposure, and whether vendor remediation exists. Avoid assuming affected versions beyond V15.03.05.19.
Mitigation direction
- Check Tenda guidance for firmware updates or replacement advice.
- Restrict router administration to trusted management networks or VPN access.
- Disable remote administration if it is enabled and not required.
- Rotate administrator credentials and enforce strong unique passwords.
- Monitor for unexpected access to /goform/SetNetControlList.
- Isolate or replace affected devices if no fix is available.
Validation and detection
- Inventory Tenda AC18 routers and record firmware versions.
- Confirm whether any device runs V15.03.05.19.
- Verify management interfaces are not internet-exposed.
- Review administrative access logs for unusual activity.
- Check vendor channels for updated firmware or advisories.
- Document compensating controls for unfixed 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.
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-2022-40861 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
- 7.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/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:H/UI:N/S:U/C:H/I:H/A:H1.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.2HighVector: CVSS:3.1/AV:N/AC:L/PR:H/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/AC18/formSetQosBand.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.