CVE-2026-2148
Published: 08 February 2026
Summary
CVE-2026-2148 is a medium-severity Exposure of Sensitive Information to an Unauthorized Actor (CWE-200) vulnerability in Tenda Ac21 Firmware. Its CVSS base score is 5.3 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 6.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Automated marking applies security attributes to system outputs, making it harder for attackers to exploit unmarked sensitive information leading to unauthorized exposure.
Associating and retaining security attributes with data directly supports enforcement of access control decisions across storage, processing, and transmission.
Enforces rules governing access to the system and its data from external systems based on established trust relationships.
This control requires verifying that a sharing partner's access authorizations match the information's restrictions before sharing occurs.
Review and removal of nonpublic information from publicly accessible systems directly prevents exposure of sensitive data to unauthorized actors.
Data mining protection mechanisms detect and block unauthorized bulk extraction of sensitive data, directly mitigating exposure to unauthorized actors.
Literacy training teaches users to recognize and avoid actions that result in unauthorized exposure of sensitive information.
Retaining and monitoring training records confirms personnel have completed privacy and security awareness training on handling sensitive data, reducing the chance of unauthorized exposure due to lack of knowledge.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Direct unauthenticated remote exploitation of the web management interface (/cgi-bin/DownloadFlash) on a publicly exposed router matches T1190 Exploit Public-Facing Application; info disclosure enables initial access and reconnaissance but no other Enterprise techniques are directly facilitated.
NVD Description
A security vulnerability has been detected in Tenda AC21 16.03.08.16. Affected is an unknown function of the file /cgi-bin/DownloadFlash of the component Web Management Interface. The manipulation leads to information disclosure. It is possible to initiate the attack remotely. The…
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exploit has been disclosed publicly and may be used.
Deeper analysisAI
CVE-2026-2148 is an information disclosure vulnerability affecting the Tenda AC21 router on firmware version 16.03.08.16. The issue resides in an unknown function of the /cgi-bin/DownloadFlash file within the Web Management Interface component. Published on 2026-02-08, it has a CVSS v3.1 base score of 5.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N) and is linked to CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) and CWE-284 (Improper Access Control).
The vulnerability enables remote exploitation without authentication, privileges, or user interaction, requiring only low attack complexity over the network. Attackers can manipulate the affected function to disclose sensitive information, though the impact is limited to low confidentiality loss with no effects on integrity or availability.
Advisories and further details are documented in VulDB entries (ctiid.344850, id.344850, submit.747557), a GitHub issue at master-abc/cve/issues/27, and on the Tenda website at tenda.com.cn.
The exploit has been publicly disclosed and may be used by attackers.
Details
- CWE(s)