CVE-2026-7851
Published: 05 May 2026
Summary
CVE-2026-7851 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 7.3 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 37.6th percentile by exploit likelihood (below the median); 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-2026-7851 is a stack-based buffer overflow vulnerability affecting the D-Link DI-8100 router on firmware version 16.07.26A1. The flaw exists in the sprintf function within the yyxz.asp file, where manipulation of the ID argument triggers the overflow. It is remotely exploitable and has a CVSS v3.1 base score of 7.2 (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H), mapped to CWEs-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) and CWE-121 (Stack-based Buffer Overflow).
An authenticated attacker with high privileges can exploit this vulnerability remotely with low complexity and no user interaction required. Exploitation leads to high impacts on confidentiality, integrity, and availability, enabling potential full system compromise such as arbitrary code execution or denial of service. A public exploit is available and might be used.
Advisories and technical details are documented in references including a GitHub proof-of-concept report at https://github.com/draw-ctf/report/blob/main/DI-8100/yyxz_dlink_asp_overflow.md and VULDB entries at https://vuldb.com/vuln/361128. The D-Link website (https://www.dlink.com/) is also referenced for further information, though specific patch or mitigation guidance is not detailed in the available data.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-27416
Vulnerability details
A vulnerability was identified in D-Link DI-8100 16.07.26A1. This affects the function sprintf of the file yyxz.asp. The manipulation of the argument ID leads to stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit is…
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publicly available and might be used.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stack-based buffer overflow in public-facing web interface (yyxz.asp) directly enables remote exploitation of an Internet-facing application for RCE/DoS on the router.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly enforces validation of the ID argument supplied to yyxz.asp, blocking the malformed input that triggers the sprintf stack overflow.
Requires hardware or software memory-protection mechanisms that can render stack-based buffer overflows non-exploitable even if input validation fails.
Mandates prompt identification and remediation of the publicly disclosed flaw in the D-Link firmware's yy.asp sprintf handling.