Buffer overflow in Totolink X5000r
CVE-2026-8137
A vulnerability has been found in Totolink X5000R 9.1.0u.6369_B20230113. This vulnerability affects the function sub_458E40 of the file /boafrm/formDdns. The manipulation of the argument submit-url leads to buffer overflow. Remote exploitation of the attack is possible. The exploit has been disclosed to the public and may be used.
Vulnerability class: Buffer Overflow
Published · last modified .
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 .
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 X5000r — versions 9.1.0u.6369_B20230113
Weakness classification (CWE)
References
- vuldb.com/vuln/361926 (technical-description, vdb-entry)
- vuldb.com/vuln/361926/cti (signature, permissions-required)
- vuldb.com/submit/808863 (third-party-advisory)
- github.com/Kiciot/cve/issues/4 (issue-tracking, exploit)
- www.totolink.net/ (product)
Frequently asked questions
- What is CVE-2026-8137?
- CVE-2026-8137 is a high-severity vulnerability in Totolink X5000r, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2026-05-08.
- How severe is CVE-2026-8137?
- High severity. CVSS v3 base score is 8.8 out of 10.