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Ac6 Firmware CVE-2025-30256

HIGH
Missing Release of Resource after Effective Lifetime (CWE-772)
2025-08-20 talos-cna@cisco.com
Denial Of Service Tenda Ac6 Firmware
8.6
CVSS 3.1 · NVD
View

Vulnerability Assessment

Weakness
CWE
CWE-772
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V15 - Secure Coding and Architecture Resource cleanup on lifecycle end
Impact

CVSS score of 8.6 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. EPSS exploitation probability: 0.10%.
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 denial of service vulnerability exists in the HTTP Header Parsing functionality of Tenda AC6 V5.0 V02.03.01.110. Rated high severity (CVSS 8.6), this vulnerability is remotely exploitable, no authentication required, 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.

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Technical ContextAI · show details

This vulnerability is classified under CWE-772. A denial of service vulnerability exists in the HTTP Header Parsing functionality of Tenda AC6 V5.0 V02.03.01.110. A specially crafted series of HTTP requests can lead to a reboot. An attacker can send multiple network packets to trigger this vulnerability. Affected products include: Tenda Ac6 Firmware.

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Severity by source

NVD PRIMARY 8.6 HIGH
AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High

DescriptionCVE.org

A denial of service vulnerability exists in the HTTP Header Parsing functionality of Tenda AC6 V5.0 V02.03.01.110. A specially crafted series of HTTP requests can lead to a reboot. An attacker can send multiple network packets to trigger this vulnerability.

Executive ViewAI

Why It Matters

Organizations using the HTTP Header Parsing functionality of Tenda AC6 face significant risk from CVE-2025-30256 rated CVSS 8.6. Successful exploitation could significantly impact the confidentiality, integrity, or availability of affected systems. Organizations should apply vendor updates when available and consider compensating controls in the interim.

Business Impact: Severe
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 73% 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

SSVC Decision· derived
Out-of-Cycle
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact
Very High

Priority Score

43
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +43
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)CVE.org

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

More in Ac6 Firmware

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CVE-2024-52714 CRITICAL POC
9.8 Nov 19

Tenda AC6 v2.0 v15.03.06.50 was discovered to contain a buffer overflow in the function 'fromSetSysTime. Rated critical

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9.8 Feb 12

Tenda AC6 V15.03.05.16 firmware has a buffer overflow vulnerability in the formexeCommand function. Rated critical sever
CVE-2025-29031 CRITICAL POC
9.8 Mar 14

Tenda AC6 v15.03.05.16 was discovered to contain a buffer overflow via the fromAddressNat function. Rated critical sever
CVE-2025-29030 CRITICAL POC
9.8 Mar 14

Tenda AC6 v15.03.05.16 was discovered to contain a buffer overflow via the formWifiWpsOOB function. Rated critical sever
CVE-2025-29029 CRITICAL POC
9.8 Mar 14

Tenda AC6 v15.03.05.16 was discovered to contain a buffer overflow via the formSetSpeedWan function. Rated critical seve
CVE-2023-40838 CRITICAL POC
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 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 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 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 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 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 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

Same weakness CWE-772 – Missing Release of Resource after Effective Lifetime

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CVE-2024-2398 HIGH POC
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CVE-2018-19760 HIGH POC
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CVE-2017-13748 HIGH POC
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CVE-2017-15268 HIGH POC
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Same technique Denial Of Service

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CVE-2015-5119 CRITICAL POC
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CVE-2011-2462 CRITICAL POC
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CVE-2011-0611 HIGH POC
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CVE-2012-1889 HIGH POC
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CVE-2012-0507 CRITICAL POC
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CVE-2014-1761 HIGH POC
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CVE-2015-5122 CRITICAL POC
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CVE-2011-0609 HIGH POC
7.8

References

Advisories & patches
REF https://talosintelligence.com/vulnerability_reports/TALOS-2025-2166 REF https://www.talosintelligence.com/vulnerability_reports/TALOS-2025-2166

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