High severity · published May 8, 2026
CVE-2026-8137
Totolink X5000R formDdns sub_458E40 buffer overflow
8.8
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 40% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
X5
X5000R · Totolink
9.1.0u.6369_B20230113 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-8137
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-8137
github.com
https://github.com/Kiciot/cve/issues/4
vuldb.com
https://vuldb.com/submit/808863
vuldb.com
https://vuldb.com/vuln/361926
vuldb.com
https://vuldb.com/vuln/361926/cti
www.totolink.net
https://www.totolink.net/
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