Buffer overflow in Totolink A3600r
CVE-2026-1686
A security flaw has been discovered in Totolink A3600R 5.9c.4959. This issue affects the function setAppEasyWizardConfig in the library /lib/cste_modules/app.so. Performing a manipulation of the argument apcliSsid results in buffer overflo…
Vulnerability class: Buffer Overflow
EPSS: 0.002 (44.8th 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 A3600r — versions 5.9c.4959
Weakness classification (CWE)
References
- VDB-343480 | Totolink A3600R app.so setAppEasyWizardConfig buffer overflow (vdb-entry, technical-description)
- VDB-343480 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
- Submit #740888 | TOTOLINK A3600R V5.9c.4959 Buffer Overflow (third-party-advisory)
- github.com/SunnyYANGyaya/cuicuishark-sheep-fishIOT/blob/main/ToTolink/A3600R/49… (related)
- github.com/SunnyYANGyaya/cuicuishark-sheep-fishIOT/blob/main/ToTolink/A3600R/49… (exploit)
- www.totolink.net/ (product)
Frequently asked questions
- What is CVE-2026-1686?
- CVE-2026-1686 is a high-severity vulnerability in Totolink A3600r, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2026-01-30.
- How severe is CVE-2026-1686?
- High severity. CVSS v3 base score is 8.8 out of 10.