CVE-2026-4565

Tenda AC21 SetNetControlList formSetQosBand buffer overflow

HIGH
8.8
CVSS Score
Published: March 23, 2026 at 12:34 AM UTC
Updated: June 17, 2026 at 10:56 AM UTC
1 product affected across 1 vendorAC21 Firmware

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Severity
HIGH8.8
Exploit prediction
EPSS 1.0%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

tenda-ac21 (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (6)

VDB EntryTechnical DescriptionThird Party Advisory
Source: cverecord
https://vuldb.com/?id.352402
SignaturePermissions RequiredVDB Entry
Source: cverecord
https://vuldb.com/?ctiid.352402
Third Party AdvisoryVDB Entry
Source: cverecord
https://vuldb.com/?submit.775119
Issue TrackingExploit
Source: cverecord
https://github.com/hellonestor/killallbug/issues/14
Broken LinkProduct
Source: cverecord
https://www.tenda.com.cn/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHVulDB
Vector?

Quick Info

StatusANALYZED
CWE
CWE-120CWE-119

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