CVE-2026-4565 | Tenda AC21 16.03.08.16 SetNetControlList formSetQosBand list buffer overflow

VDB-352402 · CVE-2026-4565 · GCVE-100-352402 TENDA AC21 16.03.08.16 SETNETCONTROLLIST FORMSETQOSBAND LIST BUFFER OVERFLOW HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 8.0 $0-$5k 3.50+ Summaryinfo A vulnerability categorized as critical has been discovered in Tenda AC21 16.03.08.16. The affected element is the function formSetQosBand of the file /goform/SetNetControlList. Executing a manipulation of the argument list can lead to buffer overflow. This vulnerability is tracked as CVE-2026-4565. The attack can be launched remotely. Moreover, an exploit is present. Detailsinfo A vulnerability was found in Tenda AC21 16.03.08.16. It has been declared as critical. This vulnerability affects the function formSetQosBand of the file /goform/SetNetControlList. The manipulation of the argument list with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. The advisory is available at github.com. This vulnerability was named CVE-2026-4565. The exploitation appears to be easy. The attack can be initiated remotely. Technical details and also a public exploit are known. It is possible to download the exploit at github.com. It is declared as proof-of-concept. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. Productinfo Type Router Operating System Vendor Tenda Name AC21 Version 16.03.08.16 License commercial Website Vendor: https://www.tenda.com.cn/ CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 8.8 VulDB Meta Temp Score: 8.0 VulDB Base Score: 8.8 VulDB Temp Score: 8.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Buffer overflow CWE: CWE-120 / CWE-119 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Access: Public Status: Proof-of-Concept Download: 🔒 Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 03/22/2026 Advisory disclosed 03/22/2026 +0 days VulDB entry created 03/22/2026 +0 days VulDB entry last update Sourcesinfo Vendor: tenda.com.cn Advisory: github.com Status: Not defined CVE: CVE-2026-4565 (🔒) GCVE (CVE): GCVE-0-2026-4565 GCVE (VulDB): GCVE-100-352402 scip Labs: https://www.scip.ch/en/?labs.20161013 Entryinfo Created: 03/22/2026 09:34 Changes: 03/22/2026 09:34 (57) Complete: 🔍 Submitter: junqi Cache ID: 99:98D:101 Submitinfo Accepted Submit #775119: Tenda AC21 Tenda AC21 V1.0 V16.03.08.16 Buffer Overflow (by junqi) Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸