CVE-2026-4905
Published: 27 March 2026
Summary
CVE-2026-4905 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Tenda Ac5 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-2 (Flaw Remediation).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Directly addresses the CVE by requiring timely flaw remediation through vendor firmware updates to fix the stack-based buffer overflow in the formWifiWpsOOB function.
Prevents the buffer overflow by validating the manipulated 'index' argument in POST requests to /goform/WifiWpsOOB.
Mitigates exploitation of the stack-based buffer overflow using memory protections such as stack canaries and address space layout randomization.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stack buffer overflow in network-exposed web form handler (/goform/WifiWpsOOB) directly enables remote exploitation of a public-facing application (T1190) with low privileges that yields RCE and full device control (T1068).
NVD Description
A vulnerability was found in Tenda AC5 15.03.06.47. Impacted is the function formWifiWpsOOB of the file /goform/WifiWpsOOB of the component POST Request Handler. Performing a manipulation of the argument index results in stack-based buffer overflow. Remote exploitation of the attack…
more
is possible. The exploit has been made public and could be used.
Deeper analysisAI
CVE-2026-4905 is a stack-based buffer overflow vulnerability affecting Tenda AC5 routers running firmware version 15.03.06.47. The issue resides in the formWifiWpsOOB function within the /goform/WifiWpsOOB file of the POST Request Handler component. Manipulation of the "index" argument triggers the overflow, as documented with associated CWEs-119, CWE-121, and CWE-787.
Remote attackers can exploit this vulnerability over the network with low attack complexity and low privileges (PR:L), requiring no user interaction. The CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) reflects high impacts on confidentiality, integrity, and availability, potentially enabling remote code execution. An exploit has been made public and could be used.
Advisories from VulDB (https://vuldb.com/?ctiid.353656, https://vuldb.com/?id.353656, https://vuldb.com/?submit.777393) and a detailed analysis at https://lavender-bicycle-a5a.notion.site/Tenda_AC5_WifiWpsOOB_index-32053a41781f8096a9b6e48177c25eb0 provide further technical details. The vendor site (https://www.tenda.com.cn/) should be checked for any firmware updates or mitigation guidance.
Details
- CWE(s)