High severity · published Mar 29, 2026
CVE-2026-5101
Totolink A3300R Parameter cstecgi.cgi setLanCfg command injection
8.8
CVSS
2.4%
EPSS
No
On KEV
Description
A vulnerability was identified in Totolink A3300R 17.0.0cu.557_b20221024. This affects the function setLanCfg of the file /cgi-bin/cstecgi.cgi of the component Parameter Handler. The manipulation of the argument lanIp leads to command injection. Remote exploitation of the attack is possible. The exploit is publicly available and might be used.
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)2.4% · higher than 84% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
A3
A3300R · Totolink
17.0.0cu.557_b20221024 · source: vendor
AF
A3300r Firmware · Totolink
17.0.0cu.557_b20221024 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-5101
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-5101
Exploit
https://github.com/Litengzheng/vul_db/blob/main/A3300R/vul_39/README.md
Third Party Advisory
https://vuldb.com/submit/779128
Third Party Advisory
https://vuldb.com/vuln/354126
Third Party Advisory
https://vuldb.com/vuln/354126/cti
Product
https://www.totolink.net/
More from A3300R
9.8
CVE-2026-31177
An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary commands via the stunMinAlive parameter to /cgi-bin/cstecgi.cgi
9.8
CVE-2026-31178
An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary commands via the stunMaxAlive parameter to /cgi-bin/cstecgi.cgi
9.8
CVE-2026-31181
An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary commands via the stunServerAddr parameter to…
9.8
CVE-2026-31175
An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary commands via the stunEnable parameter to /cgi-bin/cstecgi.cgi
9.8
CVE-2026-31170
An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary commands via the stun-pass parameter to /cgi-bin/cstecgi.cgi