Which versions of Tenda are affected by CVE-2026-5991?

Tenda F451 wireless router firmware 1.0.0.7 contains a stack-based buffer overflow in the web management interface that allows authenticated attackers to execute arbitrary code or disable the device.

How to fix or mitigate CVE-2026-5991?

Within 24 hours: Inventory all Tenda F451 devices running firmware version 1.0.0.7 and document their network locations and access controls. Within 7 days: Check Tenda security advisories for patched firmware versions; if available, schedule firmware updates during maintenance windows. Within 30 days: Implement network segmentation to restrict access to router web management interfaces using firewall rules and VLANs; enforce strong authentication for any management access and disable remote management if not operationally required.

Tenda CVE-2026-5991

Q: What is the CVSS score of CVE-2026-5991?

CVE-2026-5991 has a CVSS 4.0 base score of 7.4 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

EUVD-2026-21244 HIGH

Buffer Overflow (CWE-119)

2026-04-10 cna@vuldb.com

GHSA-rv6j-fg2j-q2fj

Tenda Buffer Overflow

7.4

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

7.4 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

Re-analysis Queued

Apr 29, 2026 - 20:07 vuln.today

cvss_changed

EUVD ID Assigned

Apr 10, 2026 - 00:22 euvd

EUVD-2026-21244

Analysis Generated

Apr 10, 2026 - 00:22 vuln.today

CVE Published

Apr 10, 2026 - 00:16 nvd

HIGH 7.4

DescriptionCVE.org

A vulnerability was found in Tenda F451 1.0.0.7. Affected by this issue is the function formWrlExtraSet of the file /goform/WrlExtraSet. The manipulation of the argument GO results in stack-based buffer overflow. The attack may be launched remotely. The exploit has been made public and could be used.

AnalysisAI

Stack-based buffer overflow in Tenda F451 wireless router firmware 1.0.0.7 allows authenticated remote attackers to execute arbitrary code or crash the device via crafted GO parameter to the formWrlExtraSet function in /goform/WrlExtraSet endpoint. The vulnerability permits complete compromise of device confidentiality and integrity. Publicly available exploit code exists. Attack requires low-privilege authenticated access to the web management interface.

Technical ContextAI

CWE-119 memory corruption occurs in formWrlExtraSet function when processing the GO parameter without proper bounds checking, enabling stack memory overwrite. The vulnerability exists in the wireless extra settings handler of the router's web management interface (CPE:2.3:o:tenda:f451_firmware:1.0.0.7).

RemediationAI

No vendor-released patch identified at time of analysis. Tenda has not published security advisories addressing CVE-2026-5991 on their official site (https://www.tenda.com.cn/). Affected organizations should immediately restrict administrative interface access to trusted management networks only, disable remote administration features, and implement network segmentation to isolate vulnerable devices. Monitor vendor security bulletins at https://www.tenda.com.cn/ for future firmware updates. Consider replacing end-of-life networking equipment with actively maintained alternatives if vendor support is discontinued. Detailed technical analysis and exploit proof-of-concept available at https://github.com/Jimi-Lab/cve/issues/9 and https://vuldb.com/vuln/356545.