CVE-2026-19823: Stack-based Buffer Overflow in Tenda W20E
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.
AI Analysis
Technical Summary
CVE-2026-19823 describes a stack-based buffer overflow in the Tenda W20E router firmware 15.11.0.6(1068_1546_841)_CN_TDC. The vulnerability occurs in the formQOSRuleDel function within the QoS Rule Deletion component (/goform/delQos). By manipulating the qosIndex argument, an attacker can cause a stack overflow remotely. The vulnerability has a CVSS 4.0 base score of 8.7, indicating high severity. Exploit code has been publicly released, but no official patch or remediation guidance is currently available.
Potential Impact
Successful exploitation of this vulnerability allows remote attackers to cause a stack-based buffer overflow, potentially leading to arbitrary code execution or denial of service on the affected device. The vulnerability requires no user interaction and can be triggered remotely, increasing its risk. The availability of public exploit code further elevates the threat level.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider limiting network exposure of the affected device and monitor for unusual activity related to QoS rule management. No official mitigation or temporary fix has been documented at this time.
CVE-2026-19823: Stack-based Buffer Overflow in Tenda W20E
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.
CVSS v4.0
Score 8.7high
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-19823 describes a stack-based buffer overflow in the Tenda W20E router firmware 15.11.0.6(1068_1546_841)_CN_TDC. The vulnerability occurs in the formQOSRuleDel function within the QoS Rule Deletion component (/goform/delQos). By manipulating the qosIndex argument, an attacker can cause a stack overflow remotely. The vulnerability has a CVSS 4.0 base score of 8.7, indicating high severity. Exploit code has been publicly released, but no official patch or remediation guidance is currently available.
Potential Impact
Successful exploitation of this vulnerability allows remote attackers to cause a stack-based buffer overflow, potentially leading to arbitrary code execution or denial of service on the affected device. The vulnerability requires no user interaction and can be triggered remotely, increasing its risk. The availability of public exploit code further elevates the threat level.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider limiting network exposure of the affected device and monitor for unusual activity related to QoS rule management. No official mitigation or temporary fix has been documented at this time.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-08-14T05:30:19.659Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a7f0995bf8831d53908b500
Added to database: 08/14/2026, 12:27:01 UTC
Last enriched: 08/14/2026, 12:41:21 UTC
Last updated: 08/14/2026, 18:58:42 UTC
Views: 9
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