What is the CVSS score of CVE-2025-28021?

CVE-2025-28021 has a CVSS 3.1 base score of 7.3 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L. EPSS exploitation probability: 0.3%.

Which versions of A810R Firmware are affected by CVE-2025-28021?

Organizations using a buffer overflow vulnerability in the downloadFile.cgi face moderate risk from CVE-2025-28021, a buffer overflow vulnerability rated CVSS 7.3.

Is there a public PoC exploit available for CVE-2025-28021?

Yes, a public proof-of-concept exploit is available for CVE-2025-28021. Prioritise patching immediately. EPSS: 0.3%.

How to fix or mitigate CVE-2025-28021?

Within 7 days: Identify all affected systems running a buffer overflow vulnerability in the downloadFile.cgi and apply vendor patches promptly. If patching is delayed, consider network segmentation to limit exposure.

A810R Firmware CVE-2025-28021

HIGH

Classic Buffer Overflow (CWE-120)

2025-04-23 cve@mitre.org

Buffer Overflow A810R Firmware TOTOLINK

7.3

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.3 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 18:38 vuln.today

PoC Detected

May 06, 2025 - 20:35 vuln.today

Public exploit code

CVE Published

Apr 23, 2025 - 17:16 nvd

HIGH 7.3

DescriptionCVE.org

TOTOLINK A810R V4.1.2cu.5182_B20201026 was found to contain a buffer overflow vulnerability in the downloadFile.cgi through the v14 and v3 parameters

AnalysisAI

TOTOLINK A810R V4.1.2cu.5182_B20201026 was found to contain a buffer overflow vulnerability in the downloadFile.cgi through the v14 and v3 parameters. Rated high severity (CVSS 7.3), this vulnerability is remotely exploitable, 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. TOTOLINK A810R V4.1.2cu.5182_B20201026 was found to contain a buffer overflow vulnerability in the downloadFile.cgi through the v14 and v3 parameters Affected products include: Totolink A810R 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.

CVE-2025-28021 vulnerability details – vuln.today

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