What is the CVSS score of CVE-2026-3398?

CVE-2026-3398 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 F453 Firmware are affected by CVE-2026-3398?

A critical vulnerability in Tenda F453 routers (CVE-2026-3398) exposes organizations to remote code execution through the WAN configuration interface.

Is there a public PoC exploit available for CVE-2026-3398?

Yes, a public proof-of-concept exploit is available for CVE-2026-3398. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-3398?

Within 24 hours: Identify all Tenda F453 1.0.0.3 devices in your network and isolate them from critical systems; restrict administrative access to the /goform/AdvSetWan endpoint. Within 7 days: Deploy network segmentation to limit device access and implement WAF rules to block exploitation attempts; contact Tenda for patch ETA. Within 30 days: Replace affected devices with patched alternatives or secure vendors, or decommission devices if not business-critical.

F453 Firmware CVE-2026-3398

HIGH

Buffer Overflow (CWE-119)

2026-03-01 cna@vuldb.com

Buffer Overflow Tenda F453 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

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 - 22:05 vuln.today

PoC Detected

Mar 03, 2026 - 17:32 vuln.today

Public exploit code

CVE Published

Mar 01, 2026 - 22:16 nvd

HIGH 8.8

DescriptionCVE.org

A vulnerability was determined in Tenda F453 1.0.0.3. Affected is the function fromAdvSetWan of the file /goform/AdvSetWan of the component httpd. Executing a manipulation of the argument wanmode/PPPOEPassword can lead to buffer overflow. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized.

AnalysisAI

Buffer overflow in Tenda F453 firmware versions 1.0.0.3 allows authenticated remote attackers to achieve full system compromise through malicious wanmode or PPPOEPassword parameters sent to the httpd service. Public exploit code exists for this vulnerability, and no patch is currently available. An attacker can exploit this to execute arbitrary code with complete control over confidentiality, integrity, and availability of affected devices.

Technical ContextAI

Classified as CWE-119 (Buffer Overflow). Affects F453 Firmware. A vulnerability was determined in Tenda F453 1.0.0.3. Affected is the function fromAdvSetWan of the file /goform/AdvSetWan of the component httpd. Executing a manipulation of the argument wanmode/PPPOEPassword can lead to buffer overflow. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized.

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.