High severity · published Jan 30, 2026
CVE-2026-1686
Totolink A3600R app.so setAppEasyWizardConfig buffer overflow
8.8
CVSS
0.8%
EPSS
No
On KEV
Description
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 overflow. It is possible to initiate the attack remotely. The exploit has been released to the public and may be used for attacks.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 56% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
A3
A3600R · Totolink
5.9c.4959 · source: vendor
AF
A3600r Firmware · Totolink
5.9c.4959 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-1686
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-1686
Exploit
https://github.com/SunnyYANGyaya/cuicuishark-sheep-fishIOT/blob/main/ToTolink/A3600R/4959-apcliSsid-setAppEasyWizardConfig.md
Exploit
https://github.com/SunnyYANGyaya/cuicuishark-sheep-fishIOT/blob/main/ToTolink/A3600R/4959-apcliSsid-setAppEasyWizardConfig.md#poc
Permissions Required
https://vuldb.com/?ctiid.343480
Third Party Advisory
https://vuldb.com/?id.343480
Third Party Advisory
https://vuldb.com/?submit.740888
Product
https://www.totolink.net/
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