Vulnerability · Published Aug 14, 2026 · Assigned by VulDB

CVE-2026-19823Tenda W20E QoS Rule Deletion delQos formQOSRuleDel stack-based overflow

High 8.8

In plain English

A high-severity stack buffer overflow in W20E from Tenda. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 58% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.9%top 41.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A security flaw has been discovered in Tenda W20E 15.11.0.6(1068_1546_841)_CN_TDC. Impacted is the function formQOSRuleDel of the file /goform/delQos of the component QoS Rule Deletion. Performing a manipulation of the argument qosIndex results in stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been released to the public and may be used for attacks.

Affected products (as reported)

Vendor	Product	Versions
Tenda	W20E	15.11.0.6(1068_1546_841)_CN_TDC

Weakness: CWE-121, CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R

References

VDB-389956 | Tenda W20E QoS Rule Deletion delQos formQOSRuleDel stack-based overflow vdb-entry, technical-description
VDB-389956 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
CVE-2026-19823 | CVE Analysis and Report third-party-advisory
Submit #869021 | Tenda W20E US_W20EV4.0br_V15.11.0.6(1068_1546_841)_CN_TDC.bin Buffer Overflow third-party-advisory
https://github.com/paueger/mycve/blob/main/Tenda_W20E/4.md exploit
https://www.tenda.com.cn/ product