CVE-2021-42659

6.5 mediumEPSS 0.8%

Medium (6.5) in tenda ac9 firmware. EPSS 0.8% chance of exploitation in the next 30 days.

There is a buffer overflow vulnerability in the Web server httpd of the router in Tenda router devices such as Tenda AC9 V1.0 V15.03.02.19(6318) and Tenda AC9 V3.0 V15.03.06.42_multi. When setting the virtual service, the httpd program will crash and exit when the super-long list parameter occurs.

Severity

CVSS 3.1

6.5 medium

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.8% chance of exploitation in the next 30 days; higher than 57% of CVEs (scores of 2026-10-31)
CWE: CWE-119
Published: 2022-05-24
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

tenda:ac9_firmware

References

https://github.com/Lyc-heng/routers/blob/main/routers/stack4.md
https://www.cnvd.org.cn/flaw/show/CNVD-2021-24948
https://github.com/Lyc-heng/routers/blob/main/routers/stack4.md
https://www.cnvd.org.cn/flaw/show/CNVD-2021-24948

Check your stack JSON