OS Command Injection in Weixin Auth Endpoint Component

A vulnerability was found in Chengdu Feiyuxing Technology VW2100 and VEC10GP 1.0 B-MB3W202-210825-r11775. This impacts the function handle_wechat_cn_wifi of the file var/html/webserver of the component Weixin Auth Endpoint. The manipulation of the argument extend results in os command injection. The attack can be executed remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.

Casky was already ahead

This CVE exploits attack patterns that Casky's 447matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

A critical remote code execution vulnerability exists in Chengdu Feiyuxing Technology's VW2100 and VEC10GP devices through the Weixin Auth Endpoint component. The flaw stems from improper input validation in the handle_wechat_cn_wifi function, where attackers can manipulate the 'extend' parameter to inject arbitrary operating system commands. This vulnerability carries a perfect CVSS 10.0 score due to its network-accessible attack vector requiring no authentication or user interaction. Organizations deploying these wireless devices for network connectivity are at immediate risk, particularly those in enterprise environments where these gateways may sit at critical network perimeters. The lack of vendor response compounds the threat—patches may never materialize, leaving defenders to rely solely on detection and isolation strategies.

Casky's skill library maps this vulnerability across the adversary lifecycle, with 447 matching security skills pinpointing the attack chain. Practitioners querying Casky will identify detection patterns aligned with MITRE ATT&CK Initial Access (TA0001)—network reconnaissance of the vulnerable endpoint—followed by Execution (TA0002) techniques as command injection payloads are delivered. The platform's Claude-powered reasoning correlates these with Persistence (TA0043) behaviors, as attackers often leverage initial command execution to establish backdoors on compromised devices. Security teams will see findings highlighting suspicious parameter values in HTTP requests to the Weixin Auth function, unexpected child process spawning from web server contexts, and anomalous command execution patterns. This multi-stage visibility enables practitioners to construct defense-in-depth controls: network segmentation isolating these devices, WAF rules blocking command injection syntax, and behavioral monitoring for process anomalies originating from web services.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

447 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-124580.

Abuse of Public-Facing API: Mobile API Abuse

mobile security · low

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abusing-dpapi-for-credential-access

red teaming · high

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abusing-shadow-credentials-for-privesc

red teaming · high

Run

MITRE ATT&CK Techniques

TA0001 TA0043 TA0002

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