Vulnerability · Published Mar 30, 2026 · Assigned by VulDB

CVE-2026-5102Totolink A3300R Parameter cstecgi.cgi setSmartQosCfg command injection

Medium 6.3

In plain English

A medium-severity command injection in A3300R from Totolink. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 2.4% (higher than 84% of all known vulnerabilities).

Severity (CVSS 3.1)6.3Medium

Exploit odds (30 days)2.4%top 15.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Totolink	A3300R	17.0.0cu.557_b20221024

Weakness: CWE-77, CWE-74 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

References

VDB-354127 | Totolink A3300R Parameter cstecgi.cgi setSmartQosCfg command injection vdb-entry, technical-description
VDB-354127 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
Submit #779129 | Totolink A3300R 17.0.0cu.557_b20221024 Command Injection third-party-advisory
https://github.com/Litengzheng/vul_db/blob/main/A3300R/vul_40/README.md exploit
https://www.totolink.net/ product