What is the CVSS score of CVE-2026-3400?

CVE-2026-3400 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 Ac15 Firmware are affected by CVE-2026-3400?

A critical vulnerability affecting Tenda AC15 routers (CVE-2026-3400, CVSS 8.8) poses significant risk to organizations using this networking equipment.

Is there a public PoC exploit available for CVE-2026-3400?

Yes, a public proof-of-concept exploit is available for CVE-2026-3400. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-3400?

Within 24 hours: Inventory all Tenda AC15 devices running firmware 15.13.07.13 or earlier and isolate critical systems from affected routers. Within 7 days: Implement network segmentation to limit lateral movement from compromised devices and enable enhanced monitoring on affected equipment. Within 30 days: Replace vulnerable Tenda AC15 routers with patched versions or alternative vendors, or apply vendor patches immediately upon availability.

Ac15 Firmware CVE-2026-3400

HIGH

Buffer Overflow (CWE-119)

2026-03-02 cna@vuldb.com

Buffer Overflow Stack Overflow Ac15 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 03, 2026 - 19:48 vuln.today

Public exploit code

CVE Published

Mar 02, 2026 - 00:16 nvd

HIGH 8.8

DescriptionCVE.org

A security flaw has been discovered in Tenda AC15 up to 15.13.07.13. Affected by this issue is some unknown functionality of the file /goform/TextEditingConversion. The manipulation of the argument wpapsk_crypto2_4g results in stack-based buffer overflow. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks.

AnalysisAI

Remote code execution in Tenda AC15 firmware versions up to 15.13.07.13 via a stack-based buffer overflow in the /goform/TextEditingConversion endpoint allows unauthenticated attackers to achieve complete system compromise. Public exploit code exists for this vulnerability, and no patch is currently available, creating immediate risk for deployed devices. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Authenticate to Tenda AC15 web interface

Delivery

Send POST request to /goform/TextEditingConversion

Exploit

Inject oversized wpapsk_crypto2_4g parameter

Execution

Trigger stack buffer overflow

Impact

Execute arbitrary code

Access

Authenticate to Tenda AC15 web interface

Delivery

Send POST request to /goform/TextEditingConversion

Exploit

Inject oversized wpapsk_crypto2_4g parameter

Execution

Trigger stack buffer overflow

Impact

Execute arbitrary code

Vulnerability AssessmentAI

Exploitation	Tenda AC15 firmware version 15.13.07.13 or earlier with web interface accessible. … 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 flaw, stack-based buffer overflow.
Remediation	Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: Inventory all Tenda AC15 devices running firmware 15.13.07.13 or earlier and isolate critical systems from affected routers. …

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

CVE-2026-3400 vulnerability details – vuln.today

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Ac15 Firmware CVE-2026-3400

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

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Attack ChainAIDerived

Vulnerability AssessmentAI

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External POC / Exploit Code