What is CVE-2026-51846?

CVE-2026-51846 is a critical-severity vulnerability in Tenda Ac7, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-06-19.

How severe is CVE-2026-51846?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Tenda Ac7

CVE-2026-51846

In Tenda AC7 v15.03.06.44, the wanSpeed parameter of the route /goform/AdvSetMacMtuWan has a stack buffer overflow vulnerability that can lead to remote arbitrary code execution.

Vulnerability class: Buffer Overflow

Published 2026-06-19 · last modified 2026-07-09.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (56.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Tenda Ac7
Tenda Ac7 Firmware — versions 15.03.06.44

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

www.kdev.site/cve-request_005/ (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2026-51846?: CVE-2026-51846 is a critical-severity vulnerability in Tenda Ac7, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-06-19.
How severe is CVE-2026-51846?: Critical severity. CVSS v3 base score is 9.8 out of 10.