CVE-2025-55852 in AC8
Summary
by MITRE • 09/03/2025
Tenda AC8 v16.03.34.06 is vulnerable to Buffer Overflow in the formWifiBasicSet function via the parameter security or security_5g.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 09/03/2025
The vulnerability identified as CVE-2025-55852 affects the Tenda AC8 router firmware version v16.03.34.06, presenting a critical buffer overflow condition within the formWifiBasicSet function. This flaw specifically manifests when processing the security or security_5g parameters, creating a potential pathway for remote code execution and system compromise. The buffer overflow occurs due to inadequate input validation and bounds checking within the wireless configuration handling mechanism, allowing attackers to craft malicious payloads that exceed the allocated buffer space.
The technical implementation of this vulnerability stems from improper memory management practices within the router's web interface processing code. When the formWifiBasicSet function receives the security or security_5g parameters, it fails to properly validate the length of incoming data before copying it into fixed-size buffers. This classic buffer overflow condition falls under CWE-121, which describes stack-based buffer overflow vulnerabilities, and CWE-787, which addresses out-of-bounds write conditions. The vulnerability is particularly dangerous because it exists within the web administration interface, making it accessible to remote attackers without requiring physical access to the device.
The operational impact of this vulnerability extends beyond simple denial of service conditions, as it provides potential attackers with the capability to execute arbitrary code on the affected device. Successful exploitation could result in complete system compromise, allowing attackers to gain root access, modify network configurations, install persistent backdoors, or use the device as a pivot point for attacking other systems within the network. The vulnerability affects the wireless security settings configuration, meaning that an attacker could potentially modify encryption parameters, disable security features, or establish unauthorized wireless access points. This represents a significant risk to network security and could lead to data breaches, man-in-the-middle attacks, or the establishment of persistent network footholds.
Mitigation strategies for CVE-2025-55852 should prioritize immediate firmware updates from Tenda, as the vendor is expected to release patches addressing the buffer overflow conditions. Network administrators should implement network segmentation and access controls to limit exposure, while also monitoring for unusual wireless configuration changes or unauthorized network access attempts. The vulnerability aligns with ATT&CK technique T1059.007 for command and script interpreter, as exploitation could enable attackers to execute system commands through the compromised device. Additional defensive measures include implementing network monitoring solutions to detect anomalous traffic patterns and ensuring that wireless security settings are regularly audited for unauthorized modifications. Organizations should also consider deploying intrusion detection systems that can identify potential exploitation attempts targeting known vulnerabilities in network infrastructure devices.