What is the CVSS score of CVE-2025-65220?

CVE-2025-65220 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-2025-65220?

Organizations using Tenda AC21 V16.03.08.16 should be aware of moderate risk from CVE-2025-65220, a stack-based buffer overflow vulnerability rated CVSS 4.3.

Is there a public PoC exploit available for CVE-2025-65220?

Yes, a public proof-of-concept exploit is available for CVE-2025-65220. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2025-65220?

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

Ac21 Firmware CVE-2025-65220

MEDIUM

Stack-based Buffer Overflow (CWE-121)

2025-11-20 cve@mitre.org

Stack Overflow 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 - 17:26 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 in: /goform/SetVirtualServerCfg via the list parameter.

AnalysisAI

Tenda AC21 V16.03.08.16 is vulnerable to Buffer Overflow in: /goform/SetVirtualServerCfg via the list parameter. 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 under CWE-121. Tenda AC21 V16.03.08.16 is vulnerable to Buffer Overflow in: /goform/SetVirtualServerCfg via the list parameter. Affected products include: Tenda Ac21 Firmware.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

CVE-2025-65220 vulnerability details – vuln.today

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Ac21 Firmware CVE-2025-65220

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

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External POC / Exploit Code