CVE-2025-5969
Published: 10 June 2025
Summary
CVE-2025-5969 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Dlink Dir-632 Firmware. Its CVSS base score is 7.4 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 18.7% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
CVE-2025-5969 is a stack-based buffer overflow vulnerability affecting the D-Link DIR-632 router running firmware version FW103B08. It resides in the FUN_00425fd8 function of the /biurl_grou file inside the HTTP POST Request Handler component and is tracked under CWE-119 and CWE-121. The issue is remotely triggerable and has been rated 7.4 under CVSS 4.0, with the vendor noting that the product is no longer supported.
An authenticated remote attacker can send a crafted HTTP POST request to the affected endpoint, causing memory corruption that may result in arbitrary code execution or a crash of the device. Public proof-of-concept code demonstrating the flaw has already been released.
Because the device is end-of-life, no official patches or firmware updates are available from the maintainer. The listed references consist of disclosure repositories and vulnerability database entries rather than vendor advisories.
The associated EPSS score has remained flat at 0.0146 from disclosure onward, showing no material rise that would indicate growing exploitation interest.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-17766
Vulnerability details
A vulnerability has been found in D-Link DIR-632 FW103B08 and classified as critical. Affected by this vulnerability is the function FUN_00425fd8 of the file /biurl_grou of the component HTTP POST Request Handler. The manipulation leads to stack-based buffer overflow. The…
more
attack can be launched remotely. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stack-based buffer overflow in the HTTP POST request handler (/biurl_grou) of the D-Link DIR-632 router's web interface enables remote code execution via exploitation of a public-facing application.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Ongoing control assessments and code testing (static/dynamic analysis, fuzzing) surface memory buffer restriction failures, which are then remediated before release.
Managed runtimes used by platform-independent applications (e.g., JVM, CLR) enforce memory safety, preventing most buffer overflows that require direct memory manipulation.
Memory protections (e.g., W^X, ASLR) make exploitation of buffer-boundary violations far harder to turn into code execution.
Detects exploitation attempts that produce memory corruption, crashes, or anomalous behavior.