What is CVE-2015-9551?

CVE-2015-9551 is a critical-severity vulnerability in Totolink A850r-V1. CVSS score: 9.8/10. Published 2020-11-24.

How severe is CVE-2015-9551?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Totolink A850r-V1

CVE-2015-9551

An issue was discovered on TOTOLINK A850R-V1 through 1.0.1-B20150707.1612 and F1-V2 through 1.1-B20150708.1646 devices. There is Remote Code Execution in the management interface via the formSysCmd sysCmd parameter.

Published 2020-11-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.044 (91.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 91.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.044 · newest: 0.044 · change: 0.000

Affected products

References

pierrekim.github.io/blog/2015-07-16-backdoor-and-RCE-found-in-8-TOTOLINK-produc… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2015-9551?: CVE-2015-9551 is a critical-severity vulnerability in Totolink A850r-V1. CVSS score: 9.8/10. Published 2020-11-24.
How severe is CVE-2015-9551?: Critical severity. CVSS v3 base score is 9.8 out of 10.