CVE-2026-49196: Acer Predator Connect W6X Command Injection via MAC Address Sanitization Bypass

Technical summary

The vulnerability stems from insufficient input sanitization in the MAC address validation routine of the Wi-Fi device blocking feature (CWE-77: Improper Neutralization of Special Elements used in a Command). When a user or administrator supplies a MAC address to block, the application passes this input directly into a shell execution context without stripping or escaping shell metacharacters. An attacker with high privilege level can craft a malicious MAC address string containing shell commands (e.g., command separators, pipes, or backticks) that will be executed with the privilege level of the Wi-Fi management process.

Business impact

This vulnerability poses a significant risk to organizations deploying Acer Predator Connect W6X devices in network management or security roles. Compromise of these devices could allow an attacker to establish persistent access, exfiltrate network traffic, modify firewall rules, or pivot to other network segments. For MSPs and enterprises managing multiple units, this becomes a potential attack vector for lateral movement. The requirement for administrative credentials limits the immediate blast radius but increases insider threat and supply-chain compromise scenarios.

Affected systems

Acer Predator Connect W6X Wi-Fi devices and their associated firmware are affected. This includes both the hardware appliance and the firmware versions running on it. Consult Acer's official security advisory for specific firmware version ranges impacted.

Exploitability

Exploitation requires administrative privileges on the device (CVSS:3.1 vector PR:H), which substantially lowers the attack surface compared to unauthenticated attacks. However, the attack vector is network-accessible (AV:N) and requires no user interaction (UI:N), meaning a compromised admin account, weak default credentials, or phishing-induced credentials could enable the attack. The low attack complexity (AC:L) indicates that once access is obtained, execution is straightforward. This vulnerability is not currently tracked in CISA's Known Exploited Vulnerabilities catalog, but the relative simplicity of command injection attacks makes it a practical concern for adversaries.

Remediation

Apply firmware updates from Acer that patch the MAC address sanitization routine. The advisory will specify the minimum safe firmware version. Until patching is complete, implement network access controls to restrict administrative console access to trusted IP ranges and enforce strong authentication (MFA if available). Consider disabling remote management of these devices if not actively required.

Patch guidance

Monitor Acer's security advisories for an updated firmware version addressing CVE-2026-49196. Download patches only from official Acer channels. Test patches in a lab environment with a non-production W6X device before deployment to production network segments. Firmware updates typically require device restart; schedule deployments during maintenance windows. Verify patch application by checking the device firmware version in the administrative interface post-update.

Detection guidance

Monitor administrative access logs for unusual MAC address input patterns, especially those containing shell metacharacters (semicolons, pipes, backticks, $() constructs, or newlines). Implement application-level logging on the W6X device if available and alert on command execution anomalies originating from the MAC address filtering process. Network detection can focus on suspicious outbound connections or process spawning from the Wi-Fi management daemon. Endpoint detection and response (EDR) tools on adjacent systems may detect lateral movement attempts following device compromise.

Why prioritize this

Although the CVSS score of 7.2 (HIGH) reflects the confidentiality, integrity, and availability impact, this vulnerability merits urgent but not emergency prioritization. The administrative privilege requirement (PR:H) prevents mass opportunistic exploitation, but organizations relying on these devices for critical network segmentation should patch first. The command injection primitive is a classic attack pattern with well-established exploitation techniques, increasing the likelihood of rapid weaponization once patches are released and the vulnerability becomes public knowledge. Insider threats and supply-chain scenarios elevate risk beyond the raw CVSS score.

Risk score, explained

The CVSS 3.1 score of 7.2 reflects a HIGH severity rating driven by maximum impact scores across confidentiality (C:H), integrity (I:H), and availability (A:H). The score is tempered by the high privilege requirement (PR:H) and unchanged scope (S:U). The network attack vector and low attack complexity indicate that once authenticated, exploitation is trivial. Organizations should treat this as a priority but sequenced after critical/exploited vulnerabilities in their patching workflows.

Frequently asked questions