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 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

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 - 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. …

Unlock full vulnerability intelligence

Risk assessment & exploitation conditions
Attack chain visualization
Remediation with exact patch versions
Threat intelligence from 22 sources
Personal watchlist & email alerts

Continue with Google Continue with GitHub

Free forever · No credit card required

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Send authenticated HTTP request to /goform/AdvSetWan

Exploit

Inject oversized payload in wanmode/PPPOEPassword parameter

Execution

Trigger buffer overflow in fromAdvSetWan function

Impact

Execute arbitrary code with httpd privileges

Access

Send authenticated HTTP request to /goform/AdvSetWan

Exploit

Inject oversized payload in wanmode/PPPOEPassword parameter

Execution

Trigger buffer overflow in fromAdvSetWan function

Impact

Execute arbitrary code with httpd privileges

Vulnerability AssessmentAI

Exploitation	Tenda F453 firmware version 1.0.0.3; valid user credentials required for httpd authentication; HTTP access to /goform/AdvSetWan endpoint on default port 80 Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	CVSS 8.8 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	A remote attacker could exploit this vulnerability to buffer overflow.
Remediation	Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

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. …

Threat intelligence, references, and detailed analysis are available after sign-in.

CVE-2026-3398 vulnerability details – vuln.today

Back

F453 Firmware CVE-2026-3398

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Unlock full vulnerability intelligence

Attack ChainAIDerived

Vulnerability AssessmentAI

Recommended ActionAI

Share

External POC / Exploit Code