What is the CVSS score of CVE-2025-65226?

CVE-2025-65226 has a CVSS 3.1 base score of 4.3 (Medium). CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L. EPSS exploitation probability: 0.0%.

Which versions of Ac21 Firmware are affected by CVE-2025-65226?

Organizations using Tenda AC21 V16.03.08.16 should be aware of moderate risk from CVE-2025-65226, a buffer overflow vulnerability rated CVSS 4.3.

Is there a public PoC exploit available for CVE-2025-65226?

Yes, a public proof-of-concept exploit is available for CVE-2025-65226. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2025-65226?

During next maintenance window: Identify affected systems and apply vendor patches when convenient. Monitor vendor channels for patch availability.

Ac21 Firmware CVE-2025-65226

MEDIUM

Classic Buffer Overflow (CWE-120)

2025-11-20 cve@mitre.org

Tenda Buffer Overflow Ac21 Firmware

4.3

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

4.3 MEDIUM

AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:23 vuln.today

PoC Detected

Nov 21, 2025 - 17:24 vuln.today

Public exploit code

CVE Published

Nov 20, 2025 - 15:17 nvd

MEDIUM 4.3

DescriptionCVE.org

Tenda AC21 V16.03.08.16 is vulnerable to Buffer Overflow via the deviceId parameter in /goform/saveParentControlInfo.

AnalysisAI

Tenda AC21 V16.03.08.16 is vulnerable to Buffer Overflow via the deviceId parameter in /goform/saveParentControlInfo. Rated medium severity (CVSS 4.3), this vulnerability is no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Buffer Copy without Size Check (CWE-120), which allows attackers to overflow a buffer to corrupt adjacent memory. Tenda AC21 V16.03.08.16 is vulnerable to Buffer Overflow via the deviceId parameter in /goform/saveParentControlInfo. Affected products include: Tenda Ac21 Firmware.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Always validate buffer sizes before copy operations. Use bounded functions (strncpy, snprintf). Enable compiler protections.