CVE-2026-4491
Published: 20 March 2026
Summary
CVE-2026-4491 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Com (inferred from references). 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 37.7th 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-2026-4491 is a stack-based buffer overflow vulnerability in Tenda A18 Pro firmware version 02.03.02.28. The flaw affects the fromSetIpMacBind function in the /goform/SetIpMacBind file, where manipulation of the argument list triggers the overflow. Published on 2026-03-20, it is rated 8.8 on the CVSS v3.1 scale (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) and maps to CWE-119 and CWE-121.
A remote attacker with low privileges can exploit this vulnerability over the network with low complexity and no user interaction required. Successful exploitation enables high-impact consequences, including unauthorized disclosure of information, modification of data, and denial of service.
Advisories on VulDB (ctiid.352017, id.352017, submit.773671) and a GitHub issue detail the vulnerability, with the exploit publicly disclosed and potentially usable. The Tenda website (tenda.com.cn) provides relevant vendor information for further checks on patches or mitigations.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-13738
Vulnerability details
A vulnerability has been found in Tenda A18 Pro 02.03.02.28. Impacted is the function fromSetIpMacBind of the file /goform/SetIpMacBind. Such manipulation of the argument list leads to stack-based buffer overflow. The attack can be executed remotely. The exploit has been…
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disclosed to the public and may be used.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stack-based buffer overflow in router web form (/goform/SetIpMacBind) allows remote code execution over the network with low privileges, directly mapping to exploitation of a public-facing application.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Validates and sanitizes argument list inputs to the fromSetIpMacBind function, directly preventing stack-based buffer overflows from manipulated data.
Implements memory safeguards like stack canaries, ASLR, and DEP to protect against exploitation of the stack-based buffer overflow even if invalid inputs are processed.
Ensures timely identification, reporting, and patching of the specific buffer overflow flaw in Tenda A18 Pro firmware version 02.03.02.28.