What is the CVSS score of CVE-2025-31355?

CVE-2025-31355 has a CVSS 3.1 base score of 7.2 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2025-31355?

Within 30 days: Identify all affected systems running the Firmware Signature Validation functionality of Tenda AC6 and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Ac6 Firmware CVE-2025-31355

HIGH

Download of Code Without Integrity Check (CWE-494)

2025-08-20 talos-cna@cisco.com

RCE Tenda Ac6 Firmware

7.2

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-494 OWASP Top 10:2025 A08:2025 - Software or Data Integrity Failures ASVS 5.0 V15 - Secure Coding and Architecture Code integrity verification
Impact	CVSS score of 7.2 (HIGH). Attack characteristics: network attack vector, low complexity, high privileges required, no user interaction not required. EPSS exploitation probability: 0.06%.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.

This Month Plan within 30 days. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 28, 2026

A firmware update vulnerability exists in the Firmware Signature Validation functionality of Tenda AC6 V5.0 V02.03.01.110. Rated high severity (CVSS 7.2), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

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.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified under CWE-494. A firmware update vulnerability exists in the Firmware Signature Validation functionality of Tenda AC6 V5.0 V02.03.01.110. A specially crafted malicious file can lead to arbitrary code execution. An attacker can provide a malicious file to trigger this vulnerability. Affected products include: Tenda Ac6 Firmware.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.2 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionCVE.org

A firmware update vulnerability exists in the Firmware Signature Validation functionality of Tenda AC6 V5.0 V02.03.01.110. A specially crafted malicious file can lead to arbitrary code execution. An attacker can provide a malicious file to trigger this vulnerability.

Executive ViewAI

Why It Matters

Organizations using the Firmware Signature Validation functionality of Tenda AC6 face moderate risk from CVE-2025-31355 rated CVSS 7.2. Exploitation could compromise the security of affected deployments. Organizations should apply vendor updates when available and consider compensating controls in the interim.

Business Impact: Moderate

Compensating Controls

Apply vendor patch. If immediate patching is not feasible: (1) Implement network-level access controls to limit exposure; (2) Enable enhanced monitoring and alerting; (3) Apply principle of least privilege.

Threat Intelligence Overview

EPSS Score

0.1%

Top 80% exploitable

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.1%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +36

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

Affected Products (CPE)CVE.org

cpe:2.3:o:tenda:ac6_firmware:02.03.01.110:*:*:*:*:*:*:*

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Tenda AC6 v15.03.05.16 was discovered to contain a buffer overflow via the formWifiWpsOOB function. Rated critical sever

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9.8 Mar 14

Tenda AC6 v15.03.05.16 was discovered to contain a buffer overflow via the formSetSpeedWan function. Rated critical seve

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9.8 Aug 30

Tenda AC6 US_AC6V1.0BR_V15.03.05.16_multi_TD01.bin function 'sub_3A1D0' contains a command execution vulnerability. Rate

CVE-2023-40846 CRITICAL Act Now POC

9.8 Aug 28

Tenda AC6 US_AC6V1.0BR_V15.03.05.16_multi_TD01.bin is vulnerable to Buffer Overflow via function sub_90998. Rated critic

CVE-2023-38937 CRITICAL Act Now POC

9.8 Aug 07

Tenda AC10 V1.0 V15.03.06.23, AC1206 V15.03.06.23, AC8 v4 V16.03.34.06, AC6 V2.0 V15.03.06.23, AC7 V1.0 V15.03.06.44, AC

CVE-2023-38936 CRITICAL Act Now POC

9.8 Aug 07

Tenda AC10 V1.0 V15.03.06.23, AC1206 V15.03.06.23, AC6 V2.0 V15.03.06.23, AC7 V1.0 V15.03.06.44, AC5 V1.0 V15.03.06.28,

CVE-2023-38933 CRITICAL Act Now POC

9.8 Aug 07

Tenda AC6 V2.0 V15.03.06.23, AC7 V1.0 V15.03.06.44, F1203 V2.0.1.6, AC5 V1.0 V15.03.06.28, FH1203 V2.0.1.6 and AC9 V3.0

CVE-2023-38931 CRITICAL Act Now POC

9.8 Aug 07

Tenda AC10 V1.0 V15.03.06.23, AC1206 V15.03.06.23, AC8 v4 V16.03.34.06, AC6 V2.0 V15.03.06.23, AC7 V1.0 V15.03.06.44, F1

CVE-2023-2923 CRITICAL Act Now POC

9.8 May 27

A vulnerability classified as critical was found in Tenda AC6 US_AC6V1.0BR_V15.03.05.19. Rated critical severity (CVSS 9

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References

Advisories & patches

REF https://talosintelligence.com/vulnerability_reports/TALOS-2025-2161 REF https://www.talosintelligence.com/vulnerability_reports/TALOS-2025-2161

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