Security readout for executives and security teams
Plain-English summary
Some Tenda F3 and N300 router firmware versions send administrator login credentials in cleartext during initial or post-reset web setup. Anyone on the same network who can observe traffic could capture those credentials and take over the router. This is most urgent for devices set up on shared, untrusted, or poorly controlled networks.
Executive priority
Prioritize remediation where these routers protect business networks, remote offices, or shared facilities. The main business risk is router compromise leading to traffic interception, configuration changes, or loss of network control. Treat as high priority, but not as confirmed mass exploitation based on available sources.
Technical view
CVE-2026-22079 is a CWE-319 cleartext transmission issue in the web administrative setup flow. A same-network attacker can intercept plaintext credentials during first login or after factory reset. The CVSS 4.0 score is 8.7, with adjacent attack vector, low complexity, no privileges, and no user interaction required.
Likely exposure
Exposure is limited to listed Tenda 300Mbps Wireless Router F3 and N300 Easy Setup Router firmware versions. Risk is highest during initial setup or after factory reset when admin credentials are transmitted over the local network.
Exploitation context
The source bundle does not report active exploitation, and CISA KEV status is false. Exploitation requires attacker presence on the same network segment or another position allowing local traffic interception during vulnerable setup activity.
Researcher notes
Evidence identifies the vulnerable condition and affected firmware but does not include vendor patch status in the provided bundle. Analysis should focus on confirming firmware, observing whether setup traffic is protected, and monitoring for official Tenda or CERT-In updates. Do not assume other Tenda models are affected without source support.
Mitigation direction
- Check Tenda and CERT-In guidance for fixed firmware or official workarounds.
- Avoid performing router setup on shared or untrusted networks.
- Use a trusted, isolated network path for initial setup and post-reset configuration.
- Change administrator credentials after any setup performed on an untrusted network.
- Limit access to the router administrative interface to trusted users and networks.
Validation and detection
- Inventory Tenda F3 and N300 devices in the environment.
- Compare installed firmware against the affected versions listed in the advisory.
- Identify routers recently factory-reset or initially configured on shared networks.
- Review network controls around access to the router administration interface.
- Confirm whether vendor firmware or guidance is available before remediation planning.
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-319: 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-2026-22079 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
- 8.7 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
8.7HighVector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.cert-in.org.in/s2cMainServlet?pageid=PUBVLNOTES01&VLCODE=CIVN-2026-0004CVE reference · third-party-advisory
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.
Cleartext Transmission of Sensitive Information
Cleartext Transmission of Sensitive Information represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.