RCE in Totolink A3300r
CVE-2026-5102
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.035 (88.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 88.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.024 · newest: 0.035 · change: +0.012
Affected products
- Totolink A3300r — versions 17.0.0cu.557_b20221024
- Totolink A3300r Firmware — versions 17.0.0cu.557_b20221024
Weakness classification (CWE)
References
- vuldb.com/vuln/354127 (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/vuln/354127/cti (signature, permissions-required, VDB Entry, Third Party Advisory)
- vuldb.com/submit/779129 (Permissions Required, VDB Entry, third-party-advisory)
- github.com/Litengzheng/vul_db/blob/main/A3300R/vul_40/README.md (Exploit, Third Party Advisory, exploit)
- www.totolink.net/ (Product, product)
Frequently asked questions
- What is CVE-2026-5102?
- CVE-2026-5102 is a medium-severity vulnerability in Totolink A3300r, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.3/10. Published 2026-03-30.
- How severe is CVE-2026-5102?
- Medium severity. CVSS v3 base score is 6.3 out of 10.