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High severity · published Jan 19, 2026
CVE-2026-1143
TOTOLINK A3700R cstecgi.cgi setWiFiEasyGuestCfg buffer overflow
8.8
CVSS
0.8%
EPSS
No
On KEV
Description
A weakness has been identified in TOTOLINK A3700R 9.1.2u.5822_B20200513. This affects the function setWiFiEasyGuestCfg of the file /cgi-bin/cstecgi.cgi. Executing a manipulation of the argument ssid can lead to buffer overflow. The attack may be launched remotely. The exploit has been made available to the public and could 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 55% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
A3
A3700R · TOTOLINK
9.1.2u.5822_B20200513 · source: vendor
AF
A3700r Firmware · Totolink
9.1.2u.5822_b20200513 · source: NVD
Affected product
A3
A3700R
TOTOLINK
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-1143
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-1143
Exploit
https://lavender-bicycle-a5a.notion.site/TOTOLINK-A3700R-setWiFiEasyGuestCfg-2e353a41781f8057a244ead07d5eaaff?source=copy_link
Permissions Required
https://vuldb.com/?ctiid.341735
Third Party Advisory
https://vuldb.com/?id.341735
Third Party Advisory
https://vuldb.com/?submit.735502
Product
https://www.totolink.net/
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