EUVD-2026-67254
GHSA-5ch9-5c9p-c9f8
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-reachable command injection giving root-level command execution justifies C:H/I:H/A:H; PR:N retained per description of unauthenticated exploitation, though a config-handler endpoint may require admin auth (PR:L).
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
A Command Injection vulnerability exists in the bs_SetLimitCli_info function within the libshare.so library of LB-link Router AC450M V4.0.0. This flaw occurs due to insufficient validation and sanitization of user-supplied input before it is passed to a system-level command execution context. An attacker can exploit this vulnerability by injecting specially crafted shell metacharacters or payloads into the vulnerable parameter, resulting in the execution of arbitrary operating system commands.
AnalysisAI
Command injection in the bs_SetLimitCli_info function of the libshare.so library on LB-Link AC450M (V4.0.0) routers lets attackers inject shell metacharacters into a parameter that is passed to a system-level command context, yielding arbitrary OS command execution. The CVSS 3.1 vector (9.8) describes network-reachable, unauthenticated exploitation with full confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the LB-Link AC450M (V4.0.0) management interface that exposes the bs_SetLimitCli_info / client-limit handler, and the ability to submit input to the vulnerable parameter that library passes to a command context. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals partially align and partially conflict. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch is identified at time of analysis and no fixed firmware version is published in the available data, so remediation relies on compensating controls: disable remote (WAN-side) administration so the management interface is not internet-exposed, restrict access to the router admin/web interface to trusted management hosts or a management VLAN, and change default administrative credentials to limit who can reach configuration handlers such as the client-limit feature. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all LB-Link AC450M routers on your network and assess their exposure to the internet and untrusted networks. …
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Same weakness CWE-20 – Improper Input Validation
View allSame technique Command Injection
View allShare
External POC / Exploit Code
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