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.

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 exploita…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (24.8th percentile) — read the EPSS interpretation.

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.

Affected products

Totolink X5000r — versions 9.1.0u.6369_B20230113

Weakness classification (CWE)

References

VDB-361926 | Totolink X5000R formDdns sub_458E40 buffer overflow (technical-description, vdb-entry)
VDB-361926 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
Submit #808863 | Totolink X5000R V9.1.0u.6369_B20230113 Stack-based Buffer Overflow (third-party-advisory)
cna@vuldb.com (issue-tracking, exploit)
cna@vuldb.com (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.