What is the CVSS score of CVE-2026-3677?

CVE-2026-3677 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Fh451 Firmware are affected by CVE-2026-3677?

A high-severity vulnerability (CVE-2026-3677) affecting Tenda FH451 routers has been publicly disclosed with working exploits available, but no patch has been released by the vendor.

Is there a public PoC exploit available for CVE-2026-3677?

Yes, a public proof-of-concept exploit is available for CVE-2026-3677. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-3677?

Within 24 hours: Inventory all Tenda FH451 1.0.0.9 devices across your organization and isolate affected units from production networks if operationally feasible. Within 7 days: Implement network segmentation to restrict access to the vulnerable devices, disable the /goform/setcfm endpoint via WAF or firewall rules if possible, and deploy enhanced monitoring for suspicious activities targeting these devices. Within 30 days: Develop a device replacement plan, evaluate alternative router vendors, and conduct a security assessment of any systems that may have been compromised through these devices.

Fh451 Firmware CVE-2026-3677

HIGH

Buffer Overflow (CWE-119)

2026-03-07 cna@vuldb.com

Buffer Overflow Stack Overflow Fh451 Firmware

8.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.8 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

PoC Detected

Mar 09, 2026 - 16:16 vuln.today

Public exploit code

CVE Published

Mar 07, 2026 - 22:15 nvd

HIGH 8.8

DescriptionCVE.org

A vulnerability was found in Tenda FH451 1.0.0.9. This impacts the function fromSetCfm of the file /goform/setcfm. The manipulation of the argument funcname/funcpara1 results in stack-based buffer overflow. The attack may be performed from remote. The exploit has been made public and could be used.

AnalysisAI

Stack overflow in Tenda FH451 firmware's setcfm function allows authenticated remote attackers to achieve complete system compromise through malicious funcname or funcpara1 parameters. Public exploit code exists for this vulnerability, and no patch is currently available. The flaw affects firmware version 1.0.0.9 and enables remote code execution with high impact to confidentiality, integrity, and availability.

Technical ContextAI

Classified as CWE-119 (Buffer Overflow). Affects Fh451 Firmware. A vulnerability was found in Tenda FH451 1.0.0.9. This impacts the function fromSetCfm of the file /goform/setcfm. The manipulation of the argument funcname/funcpara1 results in stack-based buffer overflow. The attack may be performed from remote. The exploit has been made public and could be used.

RemediationAI

Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible. Restrict network access to the affected service where possible.