Critical severity · published Mar 29, 2026
CVE-2026-5020
Totolink A3600R Parameter cstecgi.cgi setNoticeCfg command injection
9.8
CVSS
2.6%
EPSS
No
On KEV
Description
A vulnerability was detected in Totolink A3600R 4.1.2cu.5182_B20201102. Affected by this issue is the function setNoticeCfg of the file /cgi-bin/cstecgi.cgi of the component Parameter Handler. The manipulation of the argument NoticeUrl results in command injection. The attack may be launched remotely. The exploit is now public and may be used.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.6% · higher than 85% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
A3
A3600R · Totolink
4.1.2cu.5182_B20201102 · source: vendor
AF
A3600r Firmware · Totolink
4.1.2cu.5182_b20201102 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-5020
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-5020
Exploit
https://lavender-bicycle-a5a.notion.site/TOTOLINK_A3600R_setNoticeCfg-32253a41781f80c197eaf8e7558c5ed1?source=copy_link
Third Party Advisory
https://vuldb.com/submit/779536
Third Party Advisory
https://vuldb.com/vuln/353905
Permissions Required
https://vuldb.com/vuln/353905/cti
Product
https://www.totolink.net/
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