Critical severity · published Jul 14, 2026
CVE-2026-15701
Totolink NR1800X lighttpd formLogout.htm Form_Logout stack-based overflow
9.8
CVSS
1.1%
EPSS
No
On KEV
Description
A weakness has been identified in Totolink NR1800X 9.1.0u.6279_B20210910. Affected by this issue is the function Form_Logout of the file /formLogout.htm of the component lighttpd. This manipulation of the argument Host causes stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 65% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NR
NR1800X · Totolink
9.1.0u.6279_B20210910 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-15701
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-15701
github.com
https://github.com/fu9-dotom/cve/issues/1
vuldb.com
https://vuldb.com/cve/CVE-2026-15701
vuldb.com
https://vuldb.com/submit/856136
vuldb.com
https://vuldb.com/vuln/378248
vuldb.com
https://vuldb.com/vuln/378248/cti
www.totolink.net
https://www.totolink.net/
More from NR1800X
9.9
CVE-2026-82616
TOTOLINK NR1800X cstecgi.cgi setUploadSetting stack-based overflow
9.8
CVE-2026-7546
Totolink NR1800X lighttpd find_host_ip stack-based overflow
9.8
CVE-2026-5030
Totolink NR1800X Telnet Service cstecgi.cgi NTPSyncWithHost command injection
9.8
CVE-2025-45841
TOTOLINK NR1800X V9.1.0u.6681_B20230703 was discovered to contain an authenticated stack overflow via the text parameter in the setSmsCfg function
9.8
CVE-2023-7220
A vulnerability was found in Totolink NR1800X 9.1.0u.6279_B20210910 and classified as critical