VulnerabilityAnalyzed

CVE-2026-2873

A vulnerability was detected in Tenda A21 1.0.0.0.

HIGH 7.4EPSS 0.57%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.57%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

A vulnerability was detected in Tenda A21 1.0.0.0. This issue affects the function setSchedWifi of the file /goform/openSchedWifi. Performing a manipulation of the argument schedStartTime/schedEndTime results in stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit is now public and may be used.

CVSS 4.0: 7.4 HIGHCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 0.57% probability · 45th percentile
CISA KEV: Not listed
Weakness: CWE-119, CWE-121
Affected: tenda/a21 firmware
Source: cna@vuldb.com

References

https://github.com/QIU-DIE/cve-nneeww/issues/4Exploit, Issue Tracking, Mitigation, Third Party Advisory
https://vuldb.com/?ctiid.347110Permissions Required, VDB Entry
https://vuldb.com/?id.347110Third Party Advisory, VDB Entry
https://vuldb.com/?submit.754635Third Party Advisory, VDB Entry
https://www.tenda.com.cn/Product

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.