Acer is preparing a firmware update to address a critical zero-day vulnerability affecting its Wave 7 routers, following disclosure by independent security researcher Gergo Pap.

The issue affects devices running firmware versions earlier than and poses a significant risk due to unauthenticated remote exploitation.

According to Acer’s security advisory, the vulnerabilities originate from weaknesses in access control and cryptographic implementation within the router firmware.

Both flaws have been assigned a maximum severity rating under the CVSS 4.0 framework, highlighting their potential to compromise the entire system.

Acer Patching Wave 7 Zero-Day Flaw

The first vulnerability is a broken access control issue. The router exposes the file through its web interface without requiring authentication.

This log file contains sensitive data, including plaintext credentials for both the administrative web panel and Telnet services.

An attacker can remotely access this file and immediately obtain valid login credentials, effectively bypassing all authentication controls.

The second vulnerability, categorized as, involves the use of a hardcoded AES encryption key embedded in the binary. This component is responsible for handling configuration backup and restore operations.

Because the encryption key is fixed and not securely managed, attackers can decrypt router configuration backups, modify them to include malicious instructions or backdoor access, and then re-upload them to the device.

This enables persistent compromise, allowing attackers to maintain control even after system reboots or credential changes. The combination of these vulnerabilities creates a highly exploitable attack surface.

Threat actors could leverage them to gain administrative access, intercept network traffic, manipulate DNS settings, or recruit vulnerable devices into botnets.

Routers exposed to the internet are particularly at risk, as exploitation does not require prior authentication or user interaction.

Acer has confirmed that a security patch is currently under development and is expected to be released by the end of June 2026.

The company has urged users to update their firmware immediately once the fix becomes available to mitigate potential threats. In the meantime, users should take precautionary measures to reduce exposure.

These include turning off remote administration features, restricting access to the router’s management interface to trusted internal networks, and changing default or weak credentials.

Monitoring network activity for unusual behavior, such as unauthorized login attempts or configuration changes, is also recommended.

To apply the update once released, users can log in to the router’s administrative interface or navigate to the firmware update section to check for the latest version. It is important not to interrupt the update process, as doing so may corrupt the device firmware.

This disclosure highlights ongoing security challenges in consumer networking devices, particularly in the improper handling of sensitive data and the use of insecure cryptographic practices.

As routers remain a critical entry point into home and enterprise networks, timely patching and secure configuration are essential to prevent exploitation.

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