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 Tenda 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

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. An attacker can exploit this remotely with minimal complexity by manipulating the wpapsk_crypto2_4g parameter.

Technical ContextAI

Classified as CWE-119 (Buffer Overflow). Affects Ac15 Firmware. 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.

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.