PT-2026-31834 · Totolink · Totolink A7100Ru

Ltzhust · Published 2026-04-10 · Updated 2026-04-28 · CVE-2026-5994

Positive Technologies (AI Summary)

CVSS v3.1

10

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Totolink A7100RU version 7.4cu.2313 b20191024

Description A security flaw exists in the CGI Handler component of Totolink A7100RU version 7.4cu.2313 b20191024. Manipulation of the telnet enabled argument within the setTelnetCfg function in the /cgi-bin/cstecgi.cgi file can lead to os command injection. This allows for remote execution of commands. A public exploit is available.

Recommendations Update to a newer version that contains a fix for this vulnerability. As a temporary workaround, restrict access to the /cgi-bin/cstecgi.cgi file.

Exploit

Fix

RCE

OS Command Injection

Command Injection

Weakness Enumeration

CWE-78

CWE-77

Related Identifiers

BDU:2026-07505

CVE-2026-5994

Affected Products

Totolink A7100Ru

References · 10

• 🔥 https://github.com/Litengzheng/vuldb_new/blob/main/A7100RU/vul_166/README.md · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-5994 · Security Note
• https://bdu.fstec.ru/vul/2026-07505 · Security Note
• https://twitter.com/0dayPublishing/status/2042658776180789371 · Twitter Post
• https://totolink.net · Note
• https://vuldb.com/vuln/356548 · Note
• https://vuldb.com/vuln/356548/cti · Note
• https://twitter.com/CVEarity/status/2042851171027816732 · Twitter Post
• https://twitter.com/CVEnew/status/2042561812055695682 · Twitter Post
• https://vuldb.com/submit/792042 · Note