CVE-2025-9014
Published: 15 January 2026
Summary
CVE-2025-9014 is a medium-severity Improper Input Validation (CWE-20) vulnerability in Tp-Link Tl-Wr841N Firmware. Its CVSS base score is 6.3 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 42.4th 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 SC-5 (Denial-of-service Protection) and SI-10 (Information Input Validation).
Deeper analysis
CVE-2025-9014 is a Null Pointer Dereference vulnerability in the referer header check of the web portal on TP-Link TL-WR841N v14 routers, resulting from improper input validation. This flaw affects devices running firmware versions prior to 250908 and is associated with CWE-20 (Improper Input Validation) and CWE-476 (NULL Pointer Dereference). The vulnerability has a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), highlighting its high severity due to the potential for significant availability impact.
A remote, unauthenticated attacker can exploit this vulnerability by sending crafted requests to the web portal, triggering the null pointer dereference and causing a Denial of Service condition that disrupts the web portal service.
TP-Link advisories recommend mitigation by upgrading to firmware version 250908 or later, which addresses the issue. Firmware downloads are available on the manufacturer's support pages for various regions, including global, US, and Japan sites, accompanied by FAQ guidance on the update process.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-2745
Vulnerability details
A Null Pointer Dereference vulnerability exists in the referer header check of the web portal of TP-Link TL-WR841N v14, caused by improper input validation. A remote, unauthenticated attacker can exploit this flaw and cause Denial of Service on the web…
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portal service.This issue affects TL-WR841N v14: before 250908.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Null dereference in unauthenticated web portal input validation directly enables remote exploitation of a public-facing application (T1190) to trigger application DoS via crafted requests (T1499.004).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly mitigates the improper input validation flaw in the referer header check by enforcing validation mechanisms at web portal input points to prevent null pointer dereferences.
Prevents denial-of-service crashes from null pointer dereferences by implementing proper error handling during referer header processing.
Protects the web portal service availability by limiting the effects of denial-of-service exploits via crafted requests triggering the vulnerability.