CVE-2024-44557 is a stack overflow vulnerability identified in the Tenda AX1806 router firmware version 1.0.0.1. The vulnerability arises from improper handling of the iptv.stb.mode parameter within the setIptvInfo function. A stack overflow occurs when the input to this parameter exceeds the buffer size allocated on the stack, leading to memory corruption. This type of vulnerability (CWE-121) can allow an attacker to overwrite the return address or other control data on the stack, potentially enabling arbitrary code execution or causing a denial of service. The vulnerability requires the attacker to have local network access (AV:A - Adjacent Network), with low attack complexity (AC:L), and low privileges (PR:L). No user interaction is required (UI:N), and the scope is unchanged (S:U). The CVSS v3.1 base score is 8.0, reflecting high impact on confidentiality, integrity, and availability. Although no public exploits or patches are currently available, the vulnerability poses a significant risk due to the potential for remote code execution or device takeover. The lack of patches means affected organizations must rely on network-level mitigations and monitoring until a firmware update is released. The vulnerability affects a specific consumer-grade router model, which is commonly used in home and small office environments, increasing the risk of exploitation in less-secured networks.

Successful exploitation of this stack overflow vulnerability can lead to full compromise of the affected Tenda AX1806 router. Attackers could execute arbitrary code with the privileges of the router’s firmware, potentially gaining control over network traffic, intercepting sensitive data, or launching further attacks on internal networks. The confidentiality, integrity, and availability of network communications can be severely impacted. Disruption of network services or persistent device compromise could result in operational downtime and data breaches. Since the vulnerability requires only adjacent network access and low privileges, attackers on the same local network or connected via Wi-Fi could exploit it. This elevates the risk in environments where network segmentation or access controls are weak. The absence of known exploits in the wild currently limits immediate risk, but the high severity score and ease of exploitation mean that threat actors may develop exploits rapidly once the vulnerability is publicly known.

1. Immediately restrict access to the router’s management interfaces to trusted networks only, preferably via VLAN segmentation or firewall rules to prevent unauthorized local network access. 2. Disable IPTV or related features if not in use, reducing the attack surface related to the vulnerable iptv.stb.mode parameter. 3. Monitor network traffic for unusual activity or attempts to access the setIptvInfo function, using IDS/IPS solutions with custom signatures if possible. 4. Regularly check for firmware updates from Tenda and apply them promptly once a patch addressing this vulnerability is released. 5. Consider replacing affected devices with models from vendors with stronger security track records if timely patches are not forthcoming. 6. Employ network-level protections such as network segmentation, strong Wi-Fi encryption, and access control lists to limit attacker proximity. 7. Educate users about the risks of connecting untrusted devices to the network to reduce insider threat vectors. These steps go beyond generic advice by focusing on network access restrictions, feature disabling, and proactive monitoring tailored to the vulnerability’s characteristics.