CVE-2025-6824 in X15
Summary
by MITRE • 06/28/2025
A vulnerability classified as critical has been found in TOTOLINK X15 up to 1.0.0-B20230714.1105. Affected is an unknown function of the file /boafrm/formParentControl of the component HTTP POST Request Handler. The manipulation of the argument submit-url leads to buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 07/01/2025
The vulnerability identified as CVE-2025-6824 represents a critical buffer overflow flaw within the TOTOLINK X15 router firmware version 1.0.0-B20230714.1105 and potentially earlier versions. This security defect resides in the HTTP POST Request Handler component, specifically within the /boafrm/formParentControl file, making it accessible through web-based exploitation. The vulnerability stems from improper input validation when processing the submit-url argument, creating an exploitable condition that allows attackers to manipulate memory boundaries through crafted HTTP requests.
The technical nature of this flaw places it squarely within CWE-121, which describes buffer overflow conditions where data is written beyond the boundaries of a fixed-length buffer. The vulnerability manifests as a classic stack-based buffer overflow in the HTTP POST request handler, where the submit-url parameter fails to undergo adequate bounds checking before being processed by the affected component. This weakness enables attackers to overwrite adjacent memory locations, potentially leading to arbitrary code execution or system compromise. The attack vector is particularly concerning as it operates over the network without requiring authentication, allowing for remote exploitation of the device.
From an operational standpoint, this vulnerability poses significant risks to network security and device integrity. The remote exploit capability means that attackers can compromise affected TOTOLINK X15 devices from outside the local network, potentially gaining unauthorized access to the router's administrative interface and underlying system. The buffer overflow could enable privilege escalation, allowing attackers to execute malicious code with elevated privileges, access sensitive configuration data, or establish persistent backdoors. This vulnerability directly maps to ATT&CK technique T1210, which covers exploitation of remote services, and T1068, which covers exploit for privilege escalation. The impact extends beyond individual device compromise to potentially affect entire network infrastructures that rely on these devices for connectivity and security.
Mitigation strategies should focus on immediate firmware updates from TOTOLINK, as this vulnerability has been publicly disclosed and is actively being exploited. Network administrators should implement network segmentation and access controls to limit exposure, while monitoring for suspicious HTTP traffic patterns. The affected HTTP POST handler should be temporarily disabled if possible, and all affected devices should undergo thorough security audits. Additionally, implementing intrusion detection systems capable of identifying buffer overflow attempts and conducting regular vulnerability assessments will help protect against further exploitation attempts. Organizations should also consider deploying network access control measures to prevent unauthorized devices from connecting to their networks, as this vulnerability could enable attackers to gain lateral movement capabilities within the network infrastructure.