CVE-2026-2066
Published: 06 February 2026
Summary
CVE-2026-2066 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Utt 520W Firmware. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 28.3th 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).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
SI-10 requires validating inputs like groupName prior to processing, directly preventing the buffer overflow from unsafe strcpy usage.
SI-16 implements memory protections such as stack canaries or DEP to block arbitrary code execution even if the buffer overflow occurs.
SI-2 mandates timely identification, reporting, and remediation of flaws like this buffer overflow, enabling patching or workarounds despite vendor non-response.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Buffer overflow in router's web management interface (/goform/formIpGroupConfig) allows remote authenticated low-priv exploitation for arbitrary code execution, directly enabling T1190 (Exploit Public-Facing Application).
NVD Description
A weakness has been identified in UTT 进取 520W 1.7.7-180627. This affects the function strcpy of the file /goform/formIpGroupConfig. Executing a manipulation of the argument groupName can lead to buffer overflow. The attack can be launched remotely. The exploit has…
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been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Deeper analysisAI
CVE-2026-2066 is a buffer overflow vulnerability in the UTT 进取 520W router running firmware version 1.7.7-180627. The issue stems from improper use of the strcpy function in the /goform/formIpGroupConfig script, where manipulation of the groupName argument triggers the overflow. This flaw, linked to CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) and CWE-120 (Buffer Copy without Checking Size of Input), was published on 2026-02-06 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), indicating high severity.
The vulnerability can be exploited remotely by an authenticated attacker with low privileges (PR:L), requiring no user interaction. Successful exploitation allows arbitrary code execution, potentially granting high-impact confidentiality, integrity, and availability compromises, such as full system takeover on the affected device.
Advisories from VulDB and related GitHub repositories, including a public proof-of-concept, confirm the remote exploitability but note that the vendor was contacted early without any response or patch release. No official mitigations are available as of the disclosure. The public exploit availability heightens the risk for exposed UTT 进取 520W devices.
Details
- CWE(s)