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 attack can be executed remotely. The exploit is now public and may be used.
Vulnerability class: Buffer Overflow
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.008 (54.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.008 · change: +0.003
Affected products
- Totolink A800r — versions 4.1.2cu.5137_B20200730
Weakness classification (CWE)
References
- vuldb.com/vuln/357037 (technical-description, vdb-entry)
- vuldb.com/vuln/357037/cti (signature, permissions-required)
- vuldb.com/submit/793114 (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 Improper Restriction of Operations within the Bounds of a Memory Buffer. 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.