What is the CVSS score of CVE-2025-55613?

CVE-2025-55613 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of O3 Firmware are affected by CVE-2025-55613?

CVE-2025-55613 presents critical security risk, a buffer overflow vulnerability rated CVSS 9.8.

Is there a public PoC exploit available for CVE-2025-55613?

Yes, a public proof-of-concept exploit is available for CVE-2025-55613. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2025-55613?

Within 24 hours: Identify all affected systems and apply vendor patches immediately. If patching is delayed, consider network segmentation to limit exposure.

O3 Firmware CVE-2025-55613

CRITICAL

Classic Buffer Overflow (CWE-120)

2025-08-22 cve@mitre.org

Buffer Overflow Tenda O3 Firmware

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

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

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:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:08 vuln.today

PoC Detected

Sep 03, 2025 - 14:47 vuln.today

Public exploit code

CVE Published

Aug 22, 2025 - 18:15 nvd

CRITICAL 9.8

DescriptionCVE.org

Tenda O3V2 1.0.0.12(3880) is vulnerable to Buffer Overflow in the fromSafeSetMacFilter function via the mac parameter.

AnalysisAI

Tenda O3V2 1.0.0.12(3880) is vulnerable to Buffer Overflow in the fromSafeSetMacFilter function via the mac parameter. Rated critical severity (CVSS 9.8), 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. Tenda O3V2 1.0.0.12(3880) is vulnerable to Buffer Overflow in the fromSafeSetMacFilter function via the mac parameter. Affected products include: Tenda O3 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.