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CVE-2026-121930— Linksys WRT54GL Ping Diagnostic apply.cgi system os command injection

Quick assessment

Affected

Linksys WRT54GL

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linksys WRT54GL 4.30.18 固件中发现一处安全漏洞。受影响组件为 Ping 诊断功能中的 apply.cgi 文件，其 system 函数存在缺陷。攻击者可通过操纵 ping_ip 参数触发操作系统命令注入。该攻击可远程发起，相关利用代码已公开，可能被用于实施攻击。厂商在漏洞披露初期即被联系，但未作出任何回应。此漏洞仅影响已不再由维护者提供支持的产品。

CVSS 9.1 · Critical Updated Nov 05, 2026

Possible ATT&CK Techniques 2 AI

T1059.004 · Unix Shell T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

Vendor	Product	Version Range	Status
Linksys	WRT54GL	`4.30.18`	affected

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Vulnerability Information

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Vulnerability Title

Linksys WRT54GL Ping Diagnostic apply.cgi system os command injection

Source: CVE Program / CVE List V5

Vulnerability Description

A weakness has been identified in Linksys WRT54GL 4.30.18. The affected element is the function system of the file apply.cgi of the component Ping Diagnostic. This manipulation of the argument ping_ip causes os command injection. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way. This vulnerability only affects products that are no longer supported by the maintainer.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

OS命令中使用的特殊元素转义处理不恰当(OS命令注入)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Linksys	WRT54GL	4.30.18	`cpe:2.3:h:linksys:wrt54gl::::::::`

II. Public POCs for CVE-2026-121930

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-121930

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Vendor Advisories for CVE-2026-121930 (1)

CVE-2026-121930 | Linksys WRT54GL 4.30.18 Ping Diagnostic apply.cgi system ping_ip os command injection vdb-entry technical-description

Other References for CVE-2026-121930 (4)

https://github.com/Zimo-666/WRT54GL-cves/tree/main/CVE-TBD-ping-ip-command-injection exploit
https://vuldb.com/cve/CVE-2026-121930 third-party-advisory
https://vuldb.com/vuln/431042/cti signature permissions-required
https://vuldb.com/submit/1024098 third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-121930

Same Patch Batch · Linksys · 2026-11-04 · 8 CVEs total

CVE-2026-121615	10.0 CRITICAL	Linksys E5600 Login mesh_login.cgi improper authentication
CVE-2026-121932	10.0 CRITICAL	Linksys E5350 apply.cgi system os command injection
CVE-2026-121933	10.0 CRITICAL	Linksys E5350 Setup Wizard apply.cgi save_settings missing authentication
CVE-2026-121931	9.1 CRITICAL	Linksys WRT54GL Traceroute Diagnostic Function apply.cgi system os command injection
CVE-2026-121617	7.5 HIGH	Linksys E5600 Header upload_fw.cgi init_multipart out-of-bounds write
CVE-2026-121616	5.3 MEDIUM	Linksys E5600 JSON Request mesh_login.cgi strcpy out-of-bounds write
CVE-2026-121618	5.3 MEDIUM	Linksys E5600 Factory Quality Control fqc.cgi information disclosure

IV. Related Vulnerabilities

Same product: WRT54GL

Same vendor: Linksys

Same weakness: CWE-78