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High severity · published Mar 30, 2026
CVE-2026-5102
Totolink A3300R Parameter cstecgi.cgi setSmartQosCfg command injection
8.8
CVSS
2.4%
EPSS
No
On KEV
Description
A security flaw has been discovered in Totolink A3300R 17.0.0cu.557_b20221024. This vulnerability affects the function setSmartQosCfg of the file /cgi-bin/cstecgi.cgi of the component Parameter Handler. The manipulation of the argument qos_up_bw results in command injection. The attack can be executed 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)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
Affected product
A3
A3300R
Totolink
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-5102
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-5102
Exploit
https://github.com/Litengzheng/vul_db/blob/main/A3300R/vul_40/README.md
Permissions Required
https://vuldb.com/submit/779129
Third Party Advisory
https://vuldb.com/vuln/354127
Third Party Advisory
https://vuldb.com/vuln/354127/cti
Product
https://www.totolink.net/
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