Cyber Resilience

CVE-2025-29386

Memory Safety in Tenda Ac9 Firmware 15.03.05.14

Public PoCMemory Safety
Published
14 March 2025
Modified
19 March 2025
CVSS Score v3.1 9.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0088 56th percentile
Risk Priority 77 floored blend · peak EPSS

Summary

CVE-2025-29386 is a critical-severity Out-of-bounds Write (CWE-787) vulnerability in Tenda Ac9 Firmware. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked in the top 44% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified map to SA-11 (Developer Testing and Evaluation) and SA-15 (Development Process, Standards, and Tools) — see the control section below for these in your framework.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

Tenda AC9 v1.0 running firmware V15.03.05.14_multi contains a stack-based buffer overflow in the mac parameter handler at the /goform/AdvSetMacMtuWan endpoint. The flaw is tracked as CVE-2025-29386, carries a CVSS 3.1 score of 9.8, and is classified under CWE-787. Successful exploitation permits remote arbitrary code execution on the device.

An unauthenticated attacker with network access to the WAN or LAN interface can supply a crafted mac value that overflows the stack buffer. Because the vulnerability requires no credentials or user interaction, an adversary can achieve full control of the router, including the ability to read, modify, or delete data and to disrupt device operation.

The EPSS score for this CVE rose from a low baseline to a recorded peak of 0.0425, indicating that exploitation interest increased after public disclosure. The sole reference currently available is a technical write-up hosted on GitHub that describes the vulnerable parameter and proof-of-concept details; no vendor advisory or firmware patch information is included in the supplied data.

EU & UK References

Vulnerability Data

In Tenda AC9 v1.0 V15.03.05.14_multi, the mac parameter of /goform/AdvSetMacMtuWan has a stack overflow vulnerability, which can lead to remote arbitrary code execution.

CWE(s)
CWE-787

Related Threats

MITRE ATT&CK Enterprise Techniques

T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
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 →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1210 Exploitation of Remote Services Lateral Movement
Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.
attack.mitre.org →
T1211 Exploitation for Stealth Stealth
Adversaries may exploit vulnerabilities to evade detection by hiding activity, suppressing logging, or operating within trusted or unmonitored components.
attack.mitre.org →
T1212 Exploitation for Credential Access Credential Access
Adversaries may exploit software vulnerabilities in an attempt to collect credentials.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-24543Same product: Tenda Ac9
CVE-2023-41560Same product: Tenda Ac9
CVE-2023-41554Same product: Tenda Ac9
CVE-2025-29384Same product: Tenda Ac9
CVE-2025-29385Same product: Tenda Ac9
CVE-2025-29387Same product: Tenda Ac9
CVE-2025-5847Same product: Tenda Ac9
CVE-2023-41553Same product: Tenda Ac9
CVE-2023-41563Same product: Tenda Ac9
CVE-2023-41552Same product: Tenda Ac9

Affected Assets

tenda
ac9 firmware
15.03.05.14

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SA-11 Developer Testing and Evaluation good match

Developer testing and evaluation (including fuzzing and bounds checks) finds out-of-bounds write flaws before deployment.

SA-15 Development Process, Standards, and Tools partial match

Requiring documented secure-development standards and tools can mandate bounds-checked coding practices that avoid the weakness.

SI-10 Information Input Validation partial match

Input validation can structurally reject or sanitize data that would otherwise trigger an out-of-bounds write.

SI-16 Memory Protection partial match

Memory-protection mechanisms limit the exploitability and blast radius of a successful out-of-bounds write.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure-development practices (static analysis, bounds checking, code review) are the primary means of preventing out-of-bounds writes.

ID.RA-01 partial match
prevents

Vulnerability scanning and recording can discover out-of-bounds write flaws so they can be remediated.

PR.PS-02 partial match
prevents

Patching or replacing vulnerable software directly eliminates known instances of this coding weakness.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing in development and acceptance can detect and prevent out-of-bounds write defects.

A.8.25 Secure development life cycle partial match
prevents

Secure development life cycle mandates practices that prevent out-of-bounds writes.

A.8.26 Application security requirements partial match
prevents

Application security requirements can specify bounds-checking and safe memory handling.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture and engineering principles reduce the likelihood of buffer overflows.

A.8.28 Secure coding partial match
prevents

Secure coding directly addresses out-of-bounds writes through language choice and coding standards.

A.8.32 Change management partial match
prevents

Change management can enforce review gates that catch unsafe memory operations before deployment.

References