CVE-2026-5566
Published: 05 April 2026
Summary
CVE-2026-5566 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability. Its CVSS base score is 7.4 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 37.2th percentile by exploit likelihood (below the median); 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).
Deeper analysis
CVE-2026-5566 is a buffer overflow vulnerability in the UTT HiPER 1250GW router, affecting versions up to 3.2.7-210907-180535. The issue resides in the strcpy function within the /goform/formNatStaticMap file, where manipulation of the NatBind argument triggers the overflow. It is classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) and CWE-120 (Buffer Copy without Checking Size of Input), with 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 attackers with low privileges over the network, requiring low complexity and no user interaction. Successful exploitation can result in high-impact confidentiality, integrity, and availability violations, potentially allowing arbitrary code execution or system compromise on the affected device.
Advisories and additional details are available in references including a GitHub issue at https://github.com/Moxxkidd/CVE/issues/1 and VulDB entries at https://vuldb.com/submit/782993, https://vuldb.com/vuln/355336, and https://vuldb.com/vuln/355336/cti. No specific patch or mitigation guidance is detailed in the provided information.
The exploit is public and may be used, as noted in the vulnerability description published on 2026-04-05.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-19079
Vulnerability details
A vulnerability was detected in UTT HiPER 1250GW up to 3.2.7-210907-180535. This affects the function strcpy of the file /goform/formNatStaticMap. Performing a manipulation of the argument NatBind results in buffer overflow. Remote exploitation of the attack is possible. The exploit…
more
is now public and may be used.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Buffer overflow in public-facing router web interface (/goform/formNatStaticMap) enables remote exploitation with low privileges leading to arbitrary code execution and system compromise, directly mapping to T1190 (Exploit Public-Facing Application) and T1068 (Exploitation for Privilege Escalation).
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Flaw remediation directly addresses the buffer overflow in the strcpy function of /goform/formNatStaticMap by applying patches or firmware updates to versions beyond 3.2.7-210907-180535.
Memory protection mechanisms like stack canaries, ASLR, and DEP prevent arbitrary code execution from the buffer overflow triggered by the NatBind argument.
Information input validation ensures the NatBind argument in /goform/formNatStaticMap is checked for size and format, preventing the buffer overflow in strcpy.