Security readout for executives and security teams
Plain-English summary
This CVE affects the Tenda F3 router admin interface. A malicious website could frame the router’s management pages and trick a logged-in administrator into unintended clicks, potentially changing router settings. It requires administrator interaction and an authenticated session, so the business risk is real but not wormable or automatically exploitable from the cited sources.
Executive priority
Treat this as a focused router hardening issue, not an emergency. Prioritize environments where Tenda F3 administration is broadly reachable or managed from shared browsing workstations.
Technical view
Tenda F3 firmware V12.01.01.55_multi lacks an anti-framing control, specifically X-Frame-Options, in the web management interface. The assigned weakness is CWE-1021. CVSS 4.0 is 5.1, with network attack vector, low complexity, active user interaction, no privilege requirement, and low integrity impact.
Likely exposure
Exposure is most likely where Tenda F3 routers run the cited firmware and administrators access the web UI from browsers that also visit untrusted sites. Risk increases if the management interface is reachable from broad internal networks or the internet.
Exploitation context
The source bundle does not cite active exploitation, and the CVE is not marked KEV. Exploitation depends on convincing an authenticated administrator to interact with attacker-controlled content that embeds the router administration interface.
Researcher notes
Evidence identifies clickjacking in the web management interface due to absent X-Frame-Options. The affected data is imperfect: the description names V12.01.01.55_multi, while the affected version field lists 0 with unknown default status. Confirm vendor scope before broad conclusions.
Mitigation direction
- Check Tenda guidance for updated firmware or vendor-recommended remediation.
- Restrict router administration access to trusted management networks only.
- Avoid using the same browser session for administration and general browsing.
- Log out of the router interface immediately after administrative work.
- Educate administrators about link-based interaction risks while authenticated.
Validation and detection
- Inventory Tenda F3 routers and record firmware versions.
- Confirm whether V12.01.01.55_multi is present in the environment.
- Review admin interface responses for missing anti-framing headers.
- Confirm the management UI is not internet-accessible.
- Review router configuration history for unexpected administrative changes.
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-1021: 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-2026-27511 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
- Medium
- CVSS
- 5.1 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/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.
SSVC decision data
CVSS vector scores
2 official scoresWe 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:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N——VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N2.81.4VulnCheckVulnerability scoring details
Base CVSS 4.0 score
5.1MediumVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://www.tendacn.com/product/F3CVE reference, VulnCheck · product
- https://www.vulncheck.com/advisories/tenda-f3-clickjacking-in-web-management-interfaceCVE reference, VulnCheck · 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.
Improper Restriction of Rendered UI Layers or Frames
Improper Restriction of Rendered UI Layers or Frames represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.