CVE-2026-30814
Published: 08 April 2026
Summary
CVE-2026-30814 is a high-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Tp-Link Archer Ax53 Firmware. Its CVSS base score is 8.0 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 10.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Timely remediation through firmware updates to version 1.7.1 Build 20260213 or later directly eliminates the stack-based buffer overflow in the tmpServer module.
Validating the length, format, and content of uploaded configuration files prevents the buffer overflow triggered by specially crafted inputs.
Stack canaries, address space layout randomization, and non-executable stack protections mitigate arbitrary code execution from the buffer overflow even if triggered.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Buffer overflow in router config upload service enables exploitation of the management interface (T1190) by low-priv authenticated users to achieve arbitrary code execution and privilege escalation (T1068).
NVD Description
A stack-based buffer overflow in the tmpServer module of TP-Link Archer AX53 v1.0 allows an authenticated adjacent attacker to trigger a segmentation fault and potentially execute arbitrary code via a specially crafted configuration file. Successful exploitation may cause a crash…
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and could allow arbitrary code execution, enabling modification of device state, exposure of sensitive data, or further compromise of device integrity. This issue affects AX53 v1.0: before 1.7.1 Build 20260213.
Deeper analysisAI
CVE-2026-30814 is a stack-based buffer overflow vulnerability (CWE-121, CWE-787) in the tmpServer module of the TP-Link Archer AX53 v1.0 router firmware. It affects versions prior to 1.7.1 Build 20260213. The flaw enables an authenticated adjacent attacker to trigger a segmentation fault and potentially execute arbitrary code by uploading a specially crafted configuration file. The vulnerability carries a CVSS v3.1 base score of 8.0 (AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), indicating high confidentiality, integrity, and availability impacts.
An attacker with adjacent network access (e.g., on the same local network) and valid low-privilege credentials can exploit this issue remotely over the network. By crafting and submitting a malicious configuration file, they can cause a device crash or achieve remote code execution. Successful exploitation could allow modification of the device's configuration or state, exposure of sensitive data such as credentials or network information, and broader compromise of the router's integrity, potentially serving as a pivot for further network attacks.
Mitigation requires updating the TP-Link Archer AX53 v1.0 to firmware version 1.7.1 Build 20260213 or later, available via TP-Link's support download pages for various regions. Additional details are provided in the Talos Intelligence vulnerability report and a related TP-Link FAQ on securing devices.
Details
- CWE(s)