PT-2026-31589 · Totolink · Totolink A7100Ru

Ltzhust2 · Published 2026-03-27 · Updated 2026-04-13 · CVE-2026-5850

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 vulnerability exists in the Totolink A7100RU version 7.4cu.2313 b20191024. The issue is related to the setVpnPassCfg function within the CGI Handler component, specifically in the file /cgi-bin/cstecgi.cgi. Manipulation of the pptpPassThru argument can lead to os command injection. Remote exploitation is possible.

Recommendations Disable remote access to the device. Update the firmware to a newer version that addresses this vulnerability.

Exploit

Fix

RCE

Command Injection

OS Command Injection

Weakness Enumeration

CWE-77

CWE-78

Related Identifiers

BDU:2026-04978

CVE-2026-5850

Affected Products

Totolink A7100Ru

References · 13

• 🔥 https://github.com/Litengzheng/vuldb_new/blob/main/A7100RU/vul_156/README.md · Exploit
• https://bdu.fstec.ru/vul/2026-04978 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-5850 · Security Note
• https://twitter.com/CveFindCom/status/2042131195538948445 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2042200764878061800 · Twitter Post
• https://twitter.com/CVEarity/status/2042543809243025509 · Twitter Post
• https://vuldb.com/submit/791266 · Note
• https://twitter.com/CVEnew/status/2042186495528993091 · Twitter Post
• https://vuldb.com/vuln/356376 · Note
• https://vuldb.com/vuln/356376/cti · Note
• https://totolink.net · Note
• https://twitter.com/0dayPublishing/status/2043787499512717669 · Twitter Post
• https://twitter.com/OrizonCyber/status/2042150583541350466 · Twitter Post