PT-2026-21743 · Totolink+1 · Totolink X5000R+1

Published 2025-12-18 · Updated 2026-03-01 · CVE-2025-67445

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions TOTOLINK X5000R version 9.1.0cu.2415 B20250515

Description The software contains a denial-of-service issue in the /cgi-bin/cstecgi.cgi component. The component reads the CONTENT LENGTH environment variable and allocates memory using malloc with insufficient bounds checking. A crafted, large POST request, when the lighttpd request size limit is not enforced, can lead to memory exhaustion or a segmentation fault, resulting in a crash of the management CGI and loss of web interface availability.

Recommendations Apply a fix that enforces bounds checking on the CONTENT LENGTH environment variable when allocating memory within the /cgi-bin/cstecgi.cgi component.

Exploit

Fix

DoS

Buffer Overflow

Resource Exhaustion

Weakness Enumeration

CWE-119

CWE-400

Related Identifiers

BDU:2026-04457

CVE-2025-67445

Affected Products

Totolink X5000R

Lighttpd

References · 9

• 🔥 https://github.com/DaRkSpOoOk/CVE-2025-67445 · Exploit
• https://bdu.fstec.ru/vul/2026-04457 · Security Note
• https://osv.dev/vulnerability/CVE-2025-67445 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-67445 · Security Note
• https://twitter.com/CVEnew/status/2027841537753874714 · Twitter Post
• https://vuldb.com/ru/?id.347600 · Note
• https://t.me/cveNotify/153566 · Telegram Post
• http://totolink.com · Note
• https://twitter.com/cracbot/status/2028062883880521788 · Twitter Post