Vulnerability · CVE-2026-4565
A vulnerability was detected in Tenda AC21 16.03.08.16.
Published Mar 23, 2026 · catalog updated Jun 17, 2026 · ac21 firmware
Check if you run it
No confirmed exploitation is on record for CVE-2026-4565. EPSS is 0.98%. Act only if a listed version of ac21 firmware is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High7.4
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.98%
- Remediation
- Advisory link
- Affected products
- cpe tenda/ac21 firmware
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.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe tenda/ac21 firmware16.03.08.16
How to fix CVE-2026-4565
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-4565. EPSS is 0.98%. Act only if a listed version of ac21 firmware is installed.
Which versions are affected?
Compare what you have installed with tenda/ac21 firmware 16.03.08.16. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-119: Buffer Overflow; CWE-120: Classic Buffer Overflow. EPSS 0.98%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Mar 23, 2026 · NIST NVD
Detected
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.
Jun 17, 2026 · NIST NVD
Updated
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.
Sources
- CVE.orgVulnerability recordCVE-2026-4565
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-4565
30-day exploitation probability 1.0%
first.org - NIST NVDVulnerability recordCVE-2026-4565
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 ma
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.