CVE-2021-43717 in iProjection
Summary
by MITRE • 08/18/2026
An issue exists in pson EH-TW5350 Epson iProjection.apk v3.2.6. If you identify a projector equipped with an iProjection function, you can access the projector using hard-coded authentication information and control the projector maliciously.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 08/18/2026
The vulnerability identified within the Epson iProjection application for Android devices, specifically version 3.2.6 distributed as pson EH-TW5350 Epson iProjection.apk, represents a critical failure in access control mechanisms due to the implementation of hard-coded authentication credentials. This flaw allows any user who can identify a projector equipped with the iProjection function to bypass legitimate authorization processes and gain unauthorized remote control over the device. The presence of static or hardcoded passwords within the application binary means that security is not dependent on unique, per-user secrets but rather on the secrecy of these embedded values, which are easily extractable through standard reverse engineering techniques such as decompilation or string analysis.
From a technical perspective, this issue falls under the category of CWE-798: Use of Hard-coded Credentials, a classification that highlights the severe risks associated with embedding sensitive authentication data directly into source code or compiled binaries. When an application relies on hard-coded credentials for device communication, it eliminates the fundamental security principle of unique identity verification. Attackers can utilize tools like APKTool or JADX to decompile the Android package and search for string literals corresponding to usernames and passwords. Once these credentials are extracted, they can be used in conjunction with network scanning tools to locate vulnerable projectors on a local network segment without requiring any prior authentication from an authorized user.
The operational impact of this vulnerability is significant, as it enables malicious actors to take full control of the projector hardware remotely. This level of access allows for unauthorized projection of content, which can be used for disruptive purposes such as displaying offensive material during presentations or public displays. Furthermore, depending on the specific firmware capabilities exposed through the iProjection protocol, an attacker might potentially alter device settings, change network configurations, or even use the projector's operating system as a foothold to pivot into other connected systems if the projector is integrated with broader enterprise networks. This transforms a simple display device into a potential vector for social engineering attacks and reputational damage within organizational environments.
In alignment with industry frameworks, this vulnerability maps directly to MITRE ATT&CK technique T1078: Valid Accounts, where attackers use legitimate credentials that have been compromised or are statically defined in software artifacts. The attack path typically involves network discovery followed by credential abuse, exploiting the lack of dynamic authentication challenges or certificate-based mutual TLS verification that would otherwise prevent unauthorized access. The absence of such mechanisms leaves the communication channel between the mobile device and the projector vulnerable to interception and manipulation using these static credentials.
Mitigation strategies for this vulnerability require a multi-layered approach involving both immediate remediation and long-term architectural changes. Users should immediately update the Epson iProjection application to any version released after 3.2.6 where Epson has addressed this issue by removing hard-coded credentials or implementing more robust authentication methods such as one-time passwords, QR code-based pairing with session tokens, or mutual TLS certificates. For organizations still running vulnerable versions, network segmentation is recommended to isolate projector networks from general corporate LANs, thereby limiting the attack surface available to potential attackers. Additionally, Epson should consider enforcing unique per-device credentials generated during manufacturing rather than shared static keys, ensuring that compromise of one device does not lead to widespread vulnerability across all units using the same firmware build.