What is the CVSS score of CVE-2026-27511?

CVE-2026-27511 has a CVSS 3.1 base score of 4.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of F3 Firmware are affected by CVE-2026-27511?

Organizations using Shenzhen Tenda F3 Wireless Router firmware V12.01.01.55_multi should be aware of moderate risk from CVE-2026-27511 rated CVSS 4.3.

Is there a public PoC exploit available for CVE-2026-27511?

Yes, a public proof-of-concept exploit is available for CVE-2026-27511. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-27511?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

F3 Firmware CVE-2026-27511

MEDIUM

Improper Restriction of Rendered UI Layers or Frames (CWE-1021)

2026-02-23 disclosure@vulncheck.com

XSS Tenda F3 Firmware

4.3

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

4.3 MEDIUM

AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

PoC Detected

Feb 23, 2026 - 20:16 vuln.today

Public exploit code

CVE Published

Feb 23, 2026 - 17:23 nvd

MEDIUM 4.3

DescriptionCVE.org

Shenzhen Tenda F3 Wireless Router firmware V12.01.01.55_multi contains a clickjacking vulnerability in the web-based administrative interface. The interface does not set the X-Frame-Options header, allowing attacker-controlled sites to embed administrative pages in an iframe and trick an authenticated administrator into unintended interactions that may result in unauthorized configuration changes.

AnalysisAI

Tenda F3 Wireless Router firmware V12.01.01.55_multi lacks clickjacking protections in its web administrative interface, enabling attackers to embed configuration pages in iframes and manipulate authenticated administrators into making unauthorized changes. Public exploit code exists for this vulnerability, affecting administrators who access the router's management interface. While the impact is limited to configuration tampering rather than direct compromise, the lack of available patches leaves affected devices vulnerable.

Technical ContextAI

Classified as CWE-1021 (Improper Restriction of Rendered UI Layers or Frames). Affects the web-based administrative component of F3 Firmware. Shenzhen Tenda F3 Wireless Router firmware V12.01.01.55_multi contains a clickjacking vulnerability in the web-based administrative interface. The interface does not set the X-Frame-Options header, allowing attacker-controlled sites to embed administrative pages in an iframe and trick an authenticated administrator into unintended interactions that may result in unauthorized configuration changes.