Dir 619l Firmware CVE-2025-6614

Risk Assessment Matrix: CVSS v3.1 score of 8.8 (High/Critical) indicates severe technical impact, but must be contextualized against real-world exploitability. Attack Vector (AV:N) and Attack Complexity (AC:L) favor attackers—remote exploitation over network with no special conditions. However, Privileges Required (PR:L) is a critical mitigating factor: authenticated access is mandatory, reducing the attack surface to users with valid credentials or those able to bypass authentication. EPSS data (if available) would indicate exploitation probability, but the public POC disclosure significantly elevates practical risk. KEV (Known Exploited Vulnerability) status, if present, confirms active real-world exploitation. The end-of-life product status is a double-edged sword: no vendor patches will be released (no remediation path for users), but attack surface may be smaller due to lower deployment density in modern networks. SSVC decision framework analysis: (E:A=Active/Proof-of-Concept, A=Automatable, T=Total/Complete) → Priority 3-4 (high priority for asset owners, but containment possible via network segmentation). Real-world risk is MODERATE-to-HIGH for organizations still operating DIR-619L routers (legacy/remote office deployments); for most enterprises, risk is LOW due to product obsolescence and typical network replacement cycles.

Attack Scenario: An attacker with valid router credentials (obtained via credential stuffing, phishing, or default credentials left unchanged) initiates an authenticated session to the DIR-619L web interface. The attacker crafts an HTTP POST request to /goform/formSetWANType_Wizard5 with an oversized 'curTime' parameter containing a payload exceeding the buffer size (likely 64-256 bytes based on typical router firmware patterns). The unchecked strcpy() call in the formSetWANType_Wizard5 function copies the payload into a stack buffer, overwriting return addresses and adjacent stack data. The attacker's shellcode executes in the context of the web server process (typically running as root on embedded systems), granting full device compromise. Subsequent actions: modifying DNS settings, intercepting traffic, installing persistent backdoors, or launching further network attacks. Public POC existence means exploit tools are readily available and lower the skill barrier for attackers. Realistic attack timing: post-credential compromise (72 hours after initial access per average dwell time) or opportunistic exploitation by script-kiddies scanning for vulnerable routers on exposed management ports.