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Description

A vulnerability was detected in Tenda AC21 16.03.08.16. Impacted is the function formSetQosBand of the file /goform/SetNetControlList. Performing a manipulation of the argument list results in buffer overflow. The attack can be initiated remotely. The exploit is now public and may be used.

PUBLISHED Reserved 2026-03-22 | Published 2026-03-23 | Updated 2026-03-23 | Assigner VulDB




HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
HIGH: 8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
HIGH: 8.8CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
9.0AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR

Problem types

Buffer Overflow

Memory Corruption

Product status

16.03.08.16
affected

Timeline

2026-03-22:Advisory disclosed
2026-03-22:VulDB entry created
2026-03-22:VulDB entry last update

Credits

junqi (VulDB User) reporter

References

vuldb.com/?id.352402 (VDB-352402 | Tenda AC21 SetNetControlList formSetQosBand buffer overflow) vdb-entry technical-description

vuldb.com/?ctiid.352402 (VDB-352402 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/?submit.775119 (Submit #775119 | Tenda AC21 Tenda AC21 V1.0 V16.03.08.16 Buffer Overflow) third-party-advisory

github.com/hellonestor/killallbug/issues/14 issue-tracking

github.com/hellonestor/killallbug/releases/tag/poc exploit patch

www.tenda.com.cn/ product

cve.org (CVE-2026-4565)

nvd.nist.gov (CVE-2026-4565)

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