What is CVE-2026-6157?

CVE-2026-6157 is a high-severity vulnerability in Totolink A800r, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2026-04-13.

How severe is CVE-2026-6157?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Totolink A800r

CVE-2026-6157

A vulnerability was detected in Totolink A800R 4.1.2cu.5137_B20200730. This impacts the function setAppEasyWizardConfig in the library /lib/cste_modules/app.so. The manipulation of the argument apcliSsid results in buffer overflow. The att…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (24.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R.

Affected products

Totolink A800r — versions 4.1.2cu.5137_B20200730

Weakness classification (CWE)

References

VDB-357037 | Totolink A800R app.so setAppEasyWizardConfig buffer overflow (vdb-entry, technical-description)
VDB-357037 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
Submit #793114 | TOTOLINK A800R V4.1.2cu.5137_B20200730 Buffer Overflow (third-party-advisory)
github.com/xyh4ck/iot_poc/blob/main/TOTOLINK/A800R/01_Buffer_Overflow_setAppEas… (exploit)
www.totolink.net/ (product)

Frequently asked questions

What is CVE-2026-6157?: CVE-2026-6157 is a high-severity vulnerability in Totolink A800r, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2026-04-13.
How severe is CVE-2026-6157?: High severity. CVSS v3 base score is 8.8 out of 10.