CVE-2026-7721 — Totolink WA300 5.2cu.7112_B20190227 Command Injection

title: CVE-2026-7721 - Totolink WA300 NTPSyncWithHost Command Injection
id: scw-2026-05-04-ai-1
status: experimental
level: critical
description: |
  Detects exploitation attempts against CVE-2026-7721 in Totolink WA300 devices. The vulnerability allows command injection via the NTPSyncWithHost function in /cgi-bin/cstecgi.cgi by manipulating the hostTime parameter. This rule specifically looks for the vulnerable URI path and the presence of command injection characters within the hostTime parameter.
author: SCW Feed Engine (AI-generated)
date: 2026-05-04
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-7721/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: webserver
detection:
  selection:
      cs-uri:
          - '/cgi-bin/cstecgi.cgi'
      cs-uri-query|contains:
          - 'NTPSyncWithHost&hostTime='
      cs-uri-query|contains:
          - ';'
      cs-uri-query|contains:
          - ' ' 
      condition: cs-uri AND cs-uri-query
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse