Cyber Resilience

CVE-2025-55613

CriticalPublic PoC

Published: 22 August 2025

Published
22 August 2025
Modified
03 September 2025
KEV Added
—
Patch
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CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0016 36.5th percentile
Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-55613 is a critical-severity Classic Buffer Overflow (CWE-120) vulnerability in Tenda O3 Firmware. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 36.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-16 (Memory Protection).

Deeper analysis

CVE-2025-55613 is a buffer overflow vulnerability (CWE-120) affecting the Tenda O3V2 firmware version 1.0.0.12(3880). The issue resides in the fromSafeSetMacFilter function, which can be triggered via a specially crafted mac parameter. Published on 2025-08-22, it carries a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), marking it as critical.

Remote attackers can exploit this vulnerability without authentication or user interaction by sending a malicious request to the affected component. Successful exploitation enables high-impact compromise of confidentiality, integrity, and availability, potentially allowing arbitrary code execution and full device takeover.

Mitigation details are available in the referenced advisory at https://github.com/wudipjq/my_vuln/blob/main/Tenda3/vuln_58/58.md.

EU & UK References

Vulnerability details

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

CWE(s)
CWE-120

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Why these techniques?

Buffer overflow in the fromSafeSetMacFilter function via mac parameter in Tenda O3V2 router web interface enables remote exploitation of a public-facing application for potential RCE or DoS.

CVEs Like This One

CVE-2025-7417Same product: Tenda O3
CVE-2025-7421Same product: Tenda O3
CVE-2025-7418Same product: Tenda O3
CVE-2025-7420Same product: Tenda O3
CVE-2025-7422Same product: Tenda O3
CVE-2025-7419Same product: Tenda O3
CVE-2025-7423Same product: Tenda O3
CVE-2025-7416Same product: Tenda O3
CVE-2025-7414Same product: Tenda O3
CVE-2025-7415Same product: Tenda O3

Affected Assets

tenda
o3 firmware
1.0.0.12\(3880\)

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match
prevent

Directly prevents buffer overflow exploitation by enforcing validation of the malicious mac parameter input to the fromSafeSetMacFilter function.

SI-16 Memory Protection good match
prevent

Implements memory safeguards such as non-executable stacks and address randomization to block arbitrary code execution from the buffer overflow.

SI-2 Flaw Remediation good match
prevent

Requires timely remediation of the specific buffer overflow flaw in the Tenda O3V2 firmware's fromSafeSetMacFilter function via patching.

References