CVE-2025-55599
Published: 22 August 2025
Summary
CVE-2025-55599 is a high-severity Out-of-bounds Write (CWE-787) vulnerability in Dlink Dir-619L Firmware. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 30.7% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-16 (Memory Protection).
Deeper analysis
CVE-2025-55599 is a buffer overflow vulnerability affecting the D-Link DIR-619L router running firmware version 2.06B01. The issue resides in the formWlanSetup function, which can be triggered via the f_wds_wepKey parameter. Classified under CWE-787 (Out-of-bounds Write) and CWE-120 (Buffer Copy without Checking Size of Input), it has a CVSS v3.1 base score of 7.5, reflecting network accessibility, low attack complexity, no required privileges or user interaction, unchanged scope, and high impact on availability with no impact on confidentiality or integrity.
Remote, unauthenticated attackers can exploit this vulnerability over the network by sending specially crafted requests to the affected function. Successful exploitation leads to a denial-of-service condition, such as device crashes or reboots, disrupting network availability without compromising data or enabling code execution.
Advisories and further details are available in the referenced GitHub repository at https://github.com/wudipjq/my_vuln/blob/main/D-Link6/vuln_65/65.md, which documents the vulnerability analysis. No official patches or mitigations from D-Link are specified in the available information.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-25590
Vulnerability details
D-Link DIR-619L 2.06B01 is vulnerable to Buffer Overflow in the formWlanSetup function via the parameter f_wds_wepKey.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
The buffer overflow vulnerability in the D-Link DIR-619L router's web interface (formWlanSetup via f_wds_wepKey parameter) enables remote exploitation of a public-facing application, facilitating initial access through arbitrary code execution.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly prevents buffer overflows by requiring validation of input parameters like f_wds_wepKey to ensure they do not exceed buffer sizes in formWlanSetup.
Mitigates buffer overflow exploitation through memory protections such as stack canaries and non-executable memory, reducing crash likelihood from out-of-bounds writes.
Requires identification, prioritization, and timely remediation of flaws like CVE-2025-55599 via firmware updates to eliminate the buffer overflow vulnerability.