Security readout for executives and security teams
Plain-English summary
A flaw in Tenda i9 firmware can let an unauthenticated network attacker crash the device with malformed input. The documented impact is denial of service, not data theft or device takeover. Business risk is highest where these devices support critical wireless access or are reachable from untrusted networks.
Executive priority
Treat as a high-priority availability risk for sites dependent on Tenda i9 wireless infrastructure. Urgency increases if devices are internet-accessible, remotely managed, or in critical locations. There is no provided evidence of active exploitation, but the attack requirements are low.
Technical view
CVE-2022-40104 is a CWE-787 out-of-bounds write in Tenda i9 v1.0.0.8(3828), reportedly in formwrlSSIDget. CVSS 3.1 is 7.5: network attack vector, low complexity, no privileges, no user interaction, availability impact high, no confidentiality or integrity impact stated.
Likely exposure
Organizations using Tenda i9 devices running firmware v1.0.0.8(3828), especially if the management interface is reachable from untrusted networks. The source bundle does not provide CPEs or evidence of additional affected versions.
Exploitation context
The CVE describes a network-reachable, unauthenticated, low-complexity denial-of-service condition. KEV is false in the provided bundle, and no cited source states active exploitation. Evidence supports credible vulnerability research, but not confirmed exploitation in the wild.
Researcher notes
The bundle identifies formwrlSSIDget and a crafted string causing DoS, but does not provide an official vendor advisory, fixed version, or affected CPE list. Avoid assuming impacts beyond availability. Validate exposure through asset inventory and network reachability, not offensive reproduction.
Mitigation direction
- Check Tenda guidance for fixed firmware or official workaround.
- Restrict management access to trusted admin networks only.
- Disable external exposure of device administration interfaces.
- Prioritize replacement if no supported firmware is available.
- Monitor affected devices for unexpected reboots or outages.
Validation and detection
- Inventory Tenda i9 devices and record firmware versions.
- Confirm whether any device runs v1.0.0.8(3828).
- Review firewall rules for exposed management interfaces.
- Check logs or monitoring for unexplained availability events.
- Track vendor advisories for patch or mitigation updates.
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-2022-40104 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
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N/I:N/A:H3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/splashsc/IOT_Vulnerability_Discovery/blob/main/Tenda/Tenda_i9/buffer_overflow_formwrlSSIDget.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.