Which versions of Tenda F1202 are affected by EUVD-2026-31633?

The Tenda F1202 router running firmware 1.2.0.20(408) contains a stack-based buffer overflow in the DHCP configuration handler that enables remote attackers to corrupt memory, potentially…

Is there a public PoC exploit available for EUVD-2026-31633?

Yes, a public proof-of-concept exploit is available for EUVD-2026-31633. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate EUVD-2026-31633?

24 HOURS: Inventory all Tenda F1202 routers; identify firmware version 1.2.0.20(408); isolate or disconnect affected units from critical network segments. 7 DAYS: Contact Tenda support for firmware update status; implement network access controls restricting administrative access to authorized networks only; test any available firmware in non-production environment. 30 DAYS: Deploy patched firmware to all affected Tenda F1202 routers (once available from vendor), or replace devices with alternative vendor equipment; verify network functionality; update device inventory and configuration management systems.

Tenda F1202 EUVD-2026-31633

Q: What is the CVSS score of EUVD-2026-31633?

EUVD-2026-31633 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%.

| CVE-2026-9430 HIGH

Stack-based Buffer Overflow (CWE-121)

2026-05-25 VulDB

GHSA-rf9r-xx56-f4rm

Tenda Stack Overflow Buffer Overflow F1202

7.4

CVSS 4.0 · Vendor: VulDB

Severity by source

Vendor (VulDB) 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 Vendor (VulDB) · only source for this CVE.

CVSS VectorVendor: VulDB

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

Analysis Generated

Jun 08, 2026 - 09:30 vuln.today

CVSS changed

May 26, 2026 - 20:07 NVD

8.8 (HIGH) 7.4 (HIGH)

DescriptionCVE.org

A vulnerability was determined in Tenda F1202 1.2.0.20(408). Affected by this issue is the function formGstDhcpSetSer of the file /goform/GstDhcpSetSerof. Executing a manipulation of the argument dips can lead to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been publicly disclosed and may be utilized.

AnalysisAI

Stack-based buffer overflow in the Tenda F1202 router (firmware 1.2.0.20(408)) allows remote attackers to corrupt memory by sending a crafted 'dips' parameter to the formGstDhcpSetSer handler at /goform/GstDhcpSetSer. Publicly available exploit code exists (published via VulDB/GitHub), though EPSS rates real-world exploitation probability very low at 0.05%, and the issue is not listed in CISA KEV.

Technical ContextAI

The vulnerability resides in the web-management HTTP handler formGstDhcpSetSer implemented in the router's goform CGI interface, which is typical of Tenda's embedded Linux/BusyBox-based SOHO router firmware. The root cause is CWE-121 (Stack-based Buffer Overflow): the 'dips' argument from the HTTP request is copied into a fixed-size stack buffer without adequate length validation, allowing an attacker to overwrite the saved return address and adjacent stack data. The single affected CPE (cpe:2.3:a:tenda:f1202:*) confirms this is firmware-specific to the Tenda F1202 device, which is consumer/SMB networking hardware where memory protections (ASLR, stack canaries, NX) are frequently absent or partial, making such overflows readily weaponizable for control-flow hijack.

RemediationAI

No vendor-released patch identified at time of analysis - Tenda has not published a fixed firmware build in the referenced advisories (VulDB 365411 and NVD), so administrators should monitor https://www.tenda.com.cn/ for an updated firmware release for the F1202. Until a patched firmware is available, restrict access to the router's HTTP management interface by disabling WAN-side administration entirely, limiting LAN-side admin to a small management VLAN or specific source IPs via ACL, and replacing any default or weak admin credentials given that the PR:L vector requires attacker authentication; consider isolating or replacing the device in high-value environments since end-of-life Tenda SOHO routers historically receive slow or no firmware fixes. Trade-offs: blocking remote administration removes convenience for off-site management, and source-IP restrictions can break legitimate workflows if not coordinated with IT staff.