This vulnerability, with a CVSS score of 7.5 (high severity), exists in firmware version ME_1.00. It allows to retrieve the router’s configuration file—including sensitive network credentials—by sending a specially crafted POST request to the device. An attacker could then gain unauthorized access to the network or use the exposed information for further attacks. A proof‑of‑concept exploit is publicly available, making this vulnerability especially dangerous for devices still connected to the internet.
The most critical aspect of the DSL-124 firmware discussion, however, is security. Like many legacy networking devices, the DSL-124 has faced scrutiny regarding security vulnerabilities. Over its lifespan, various firmware versions were discovered to contain potential exploits, ranging from authentication bypass issues to command injection vulnerabilities. These security flaws are particularly dangerous because ADSL modems serve as the direct point of entry from the internet into the home. D-Link has historically addressed these issues through firmware updates, but the reliance on the user to manually check for and install these updates creates a significant vulnerability gap. Many users continue to operate on factory-default firmware versions that may be years out of date, leaving their networks exposed to exploits that have long been patched by the manufacturer.
The Ultimate Guide to D-Link DSL-124 Firmware: Updates, Troubleshooting, and Optimization
What (H/W) is printed on your router's sticker? D-link Dsl-124 Firmware
Locate the physical sticker on the underside of your D-Link DSL-124 router.
To ensure the longevity and reliability of the D-Link DSL-124, users must follow proper firmware maintenance procedures. This involves checking the specific (e.g., H/W Ver: T1 or V1) located on the device label, as installing firmware meant for a different version can "brick" the device, rendering it unusable.
For the newer gray interface: Go to or System , then locate Firmware Upgrade . This vulnerability, with a CVSS score of 7
Alternatively, if you're experiencing specific issues like or slow speeds , let me know and I can provide troubleshooting steps focused on those problems. How to upgrade the firmware on your D-Link router
This comprehensive guide covers everything you need to know about finding, downloading, and safely installing the correct firmware for your D-Link DSL-124 router. Why You Must Update Your DSL-124 Firmware
If your router suffers from random reboots, dropped Wi-Fi signals, or overheating, a firmware update often resolves these software glitches. Over its lifespan, various firmware versions were discovered
This more recent vulnerability, with a CVSS score of 8.2 (high severity), arises from improper session management in the ME_1.00 firmware. The web management interface does not use session cookies or tokens, relying to identify authenticated sessions. An attacker on the local network can spoof the IP address of an authenticated user and hijack the session, gaining full administrative control without knowing any credentials. As of mid‑2026, no patch information is available for this vulnerability.
Note: The factory default username is and the default password is also admin (or blank on older models). If you changed these during setup, use your custom password. Step 5: Upload and Flash the New Firmware
To manually update your DSL-124 firmware, follow these steps: Wireless N 300 ADSL2+ 4-Port Router DSL-124 - D-Link