CVE-2025-7911
Published: 20 July 2025
Summary
CVE-2025-7911 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Dlink Di-8100 Firmware. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 46.1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-16 (Memory Protection).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Flaw remediation requires timely patching of the stack-based buffer overflow in the jhttpd component's sprintf function to eliminate the vulnerability.
Information input validation enforces bounds checking and sanitization of remove_ext_proto/remove_ext_port arguments before processing by sprintf, preventing the buffer overflow.
Memory protection mechanisms such as stack canaries, ASLR, and DEP directly mitigate exploitation of the stack-based buffer overflow for arbitrary code execution.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stack-based buffer overflow in public-facing jhttpd web interface (/upnp_ctrl.asp) enables remote arbitrary code execution over the network.
NVD Description
A vulnerability classified as critical was found in D-Link DI-8100 1.0. This vulnerability affects the function sprintf of the file /upnp_ctrl.asp of the component jhttpd. The manipulation of the argument remove_ext_proto/remove_ext_port leads to stack-based buffer overflow. The attack can be…
more
initiated remotely. The exploit has been disclosed to the public and may be used.
Deeper analysisAI
CVE-2025-7911 is a critical stack-based buffer overflow vulnerability affecting D-Link DI-8100 version 1.0. The flaw resides in the sprintf function within the /upnp_ctrl.asp file of the jhttpd component, triggered by manipulation of the arguments remove_ext_proto and remove_ext_port. It is associated with CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) and CWE-121 (Stack-based Buffer Overflow), and carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
The vulnerability enables remote exploitation by an attacker with low privileges, requiring network access but no user interaction. Successful exploitation can result in high impacts to confidentiality, integrity, and availability, potentially allowing arbitrary code execution through the buffer overflow.
Advisories referenced in VulDB entries (ctiid.317026, id.317026, submit.618640, submit.618641) and a GitHub repository (buobo/bo-s-CVE/blob/main/DI-8100/upnp_ctrl_asp.md) disclose a public exploit, providing technical details for security practitioners to review for mitigation strategies.
The exploit has been publicly disclosed, increasing the risk of active exploitation against unpatched D-Link DI-8100 devices.
Details
- CWE(s)