---
title: "CVE-2026-90689: Tenda W20E - Buffer Overflow"
description: "Tenda W20E 15.11.0.61068_1546_841_CN_TDC contains a stack-based buffer overflow caused by manipulation of the argument webAuthWhiteUserIndex in formDelWebAuthWhiteUser, letting remote attackers cause memory corruption, exploit requires crafted request."
url: https://panop.io/threat-heartbeat/CVE-2026-90689/
---

# CVE-2026-90689 Tenda W20E - Buffer Overflow

Tenda W20E 15.11.0.61068\_1546\_841\_CN\_TDC contains a stack-based buffer overflow caused by manipulation of the argument webAuthWhiteUserIndex in formDelWebAuthWhiteUser, letting remote attackers cause memory corruption, exploit requires crafted request.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.85% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90689)

## Details

Type

Buffer Overflow

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

14 September 2026

Updated

15 October 2026

Weakness

[CWE-119](https://cwe.mitre.org/data/definitions/119.html)

## Vendor fix

Update to the latest version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-90689](https://nvd.nist.gov/vuln/detail/CVE-2026-90689)
- [https://github.com/Amalll-Sec/router-vulnerability-research/blob/main/advisories/Tenda/W20E/formDelWebAuthWhiteUser/README.md](https://github.com/Amalll-Sec/router-vulnerability-research/blob/main/advisories/Tenda/W20E/formDelWebAuthWhiteUser/README.md)
- [https://vuldb.com/cve/CVE-2026-90689](https://vuldb.com/cve/CVE-2026-90689)
- [https://vuldb.com/submit/914981](https://vuldb.com/submit/914981)
- [https://vuldb.com/vuln/403222](https://vuldb.com/vuln/403222)
- [https://vuldb.com/vuln/403222/cti](https://vuldb.com/vuln/403222/cti)
- [https://www.tenda.com.cn/](https://www.tenda.com.cn/)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)