What is CVE-2026-7717?

CVE-2026-7717 is a high-severity vulnerability in Totolink Wa300, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2026-05-04.

How severe is CVE-2026-7717?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Totolink Wa300

CVE-2026-7717

A vulnerability was determined in Totolink WA300 5.2cu.7112_B20190227. This issue affects the function UploadCustomModule of the file /cgi-bin/cstecgi.cgi of the component POST Request Handler. Executing a manipulation of the argument File can lead to buffer overflow. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized.

Vulnerability class: Buffer Overflow

Published 2026-05-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (54.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.008 · change: +0.003

Affected products

Totolink Wa300 — versions 5.2cu.7112_B20190227

Weakness classification (CWE)

References

vuldb.com/vuln/360893 (technical-description, vdb-entry)
vuldb.com/vuln/360893/cti (signature, permissions-required)
vuldb.com/submit/807193 (third-party-advisory)
lavender-bicycle-a5a.notion.site/TOTOLINK-WA300-UploadCustomModule-34553a41781f… (exploit)
www.totolink.net/ (product)

Frequently asked questions

What is CVE-2026-7717?: CVE-2026-7717 is a high-severity vulnerability in Totolink Wa300, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2026-05-04.
How severe is CVE-2026-7717?: High severity. CVSS v3 base score is 8.8 out of 10.