CVE-2026-5103

Totolink A3300R cstecgi.cgi setUPnPCfg command injection

A weakness has been identified in Totolink A3300R 17.0.0cu.557_b20221024. This issue affects the function setUPnPCfg of the file /cgi-bin/cstecgi.cgi. This manipulation of the argument enable causes command injection. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks.

Affected

Totolink · A3300R

CVSS v4.0 VULDB

2.1 LOWCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 NVD

8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 VULDB

6.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

CVSS v2.0 VULDB

6.5 MEDIUMAV:N/AC:L/Au:S/C:P/I:P/A:P

EPSS

3.55% chance of exploitation in the next 30 days, 89th percentile

Published

2026-03-30

Proof-of-concept exploits (1)

• LvHongW/Vuln-of-totolink_A3300R/tree/main/A3300R_enable_cmd_inject2★ · 2026-03-13

Security advisories

• https://vuldb.com/vuln/354128
• https://vuldb.com/vuln/354128/cti
• https://www.totolink.net

References

• CVE Record
• NVD entry

Related

• CVE-2026-5104
• CVE-2026-5105
• CVE-2026-5176
• CVE-2026-5177
• CVE-2026-5178