CVE-2026-5046
Published: 29 March 2026
Summary
CVE-2026-5046 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Tenda Fh1201 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 25.6th 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).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Requires validation of the 'GO' argument in the formWrlExtraSet function to enforce bounds checking and prevent stack-based buffer overflow exploitation.
Implements memory protection mechanisms such as stack canaries and non-executable stacks to mitigate stack-based buffer overflows like this CVE.
Mandates timely identification, reporting, and correction of flaws such as CVE-2026-5046 through firmware patching or equivalent mitigations.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stack-based buffer overflow in authenticated web form handler (/goform/WrlExtraSet) on public-facing router enables remote low-priv RCE; directly maps to T1190 (public web app exploitation) and T1068 (priv esc via memory corruption to arbitrary code execution).
NVD Description
A flaw has been found in Tenda FH1201 1.2.0.14(408). Affected is the function formWrlExtraSet of the file /goform/WrlExtraSet of the component Parameter Handler. Executing a manipulation of the argument GO can lead to stack-based buffer overflow. The attack may be…
more
performed from remote. The exploit has been published and may be used.
Deeper analysisAI
CVE-2026-5046 is a stack-based buffer overflow vulnerability affecting the Tenda FH1201 router on firmware version 1.2.0.14(408). The issue resides in the formWrlExtraSet function within the /goform/WrlExtraSet file of the Parameter Handler component. Manipulation of the "GO" argument triggers the overflow, as documented in the CVE description published on 2026-03-29.
The vulnerability 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) and maps to CWEs-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) and CWE-121 (Stack-based Buffer Overflow). Remote attackers with low privileges can exploit it without user interaction, potentially achieving high impacts on confidentiality, integrity, and availability, such as arbitrary code execution.
An exploit for this vulnerability has been publicly disclosed on GitHub at https://github.com/Litengzheng/vul_db/blob/main/FH1201/vul_44/README.md. Additional details and CTI are available via VulDB entries at https://vuldb.com/vuln/353969, https://vuldb.com/vuln/353969/cti, and https://vuldb.com/submit/779127. The vendor site at https://www.tenda.com.cn/ is referenced, but no specific patch or mitigation guidance is detailed in the provided sources.
Details
- CWE(s)