CVE-2026-6196
Published: 13 April 2026
Summary
CVE-2026-6196 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 43.0th 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-2026-6196 is a stack-based buffer overflow vulnerability affecting the Tenda F456 router on firmware version 1.0.0.5. The flaw exists in the fromexeCommand function of the /goform/exeCommand file, where manipulation of the cmdinput argument triggers the overflow. Associated with CWE-119 and CWE-121, it was published on 2026-04-13 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).
Remote attackers with low privileges, such as authenticated users, can exploit this vulnerability over the network with low complexity and no user interaction. Successful exploitation enables high-impact outcomes, including unauthorized access to sensitive data, modification of system integrity, and denial of service through complete availability disruption, potentially leading to full device compromise.
Advisories from VulDB (https://vuldb.com/vuln/357118) document the issue and related CTI, while a public exploit is available on GitHub (https://github.com/Litengzheng/vuldb_new/blob/main/F456/vul_113/README.md). Practitioners should consult the vendor site (https://www.tenda.com.cn/) for potential firmware updates or mitigation guidance.
The exploit is public and may be used, heightening risks for unpatched Tenda F456 devices exposed to the internet.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-22055
Vulnerability details
A vulnerability was detected in Tenda F456 1.0.0.5. This affects the function fromexeCommand of the file /goform/exeCommand. Performing a manipulation of the argument cmdinput results in stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit…
more
is now public and may be used.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stack-based buffer overflow in public-facing web command execution endpoint (/goform/exeCommand) on network-exposed router enables remote exploitation of the application for initial access (T1190), remote service exploitation (T1210), and privilege escalation from low-priv authenticated user to full device compromise (T1068).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires identifying, reporting, and correcting the stack-based buffer overflow flaw in the Tenda F456 firmware's /goform/exeCommand function.
Mandates validation of the cmdinput argument to block manipulations that trigger the stack-based buffer overflow.
Provides memory safeguards such as stack canaries and non-executable stack to mitigate exploitation of the buffer overflow vulnerability.