EUVD-2026-64007
GHSA-cfmx-mjrq-52xj
Severity by source
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Adjacent network required to reach the HTTP management interface; no authentication or interaction needed; impact is availability-only (daemon crash), with no confidentiality, integrity, or scope-change.
Primary rating from Vendor (TPLink).
CVSS VectorVendor: TPLink
Lifecycle Timeline
2DescriptionCVE.org
A NULL pointer dereference vulnerability exists in the HTTP request parsing functionality of TL-MR6400 v7. An unauthenticated remote attacker can trigger the vulnerability by sending a specially crafted HTTP request containing a malformed session cookie header.
Successful exploitation may cause the HTTP service process to crash, resulting in a denial-of-service condition and temporary loss of management or CGI functionality until service recovery.
AnalysisAI
NULL pointer dereference in TP-Link TL-MR6400 v7's HTTP request parsing crashes the management daemon when an unauthenticated adjacent-network attacker sends a specially crafted request containing a malformed session cookie header. Successful exploitation results in a denial-of-service condition, disabling the web management interface and CGI functionality until service recovery - no confidentiality or integrity compromise is possible. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to be on the adjacent network (AV:A) - the same LAN segment or a network from which the router's HTTP management interface (typically port 80 or 443) is directly reachable. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N, score 7.1) accurately captures the key constraints: the attack is limited to the adjacent network (AV:A), meaning internet-based exploitation is not possible unless management is explicitly exposed to the WAN - a non-default configuration. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-released firmware update for the TL-MR6400 v7, available at https://www.tp-link.com/en/support/download/tl-mr6400/v7/ with the associated advisory at https://www.tp-link.com/us/support/faq/5259/. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all TP-Link TL-MR6400 v7 devices in your environment and assess their exposure to adjacent-network connectivity. …
Sign in for detailed remediation steps and compensating controls.
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More in Tl Mr6400 V7 0
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Same weakness CWE-476 – NULL Pointer Dereference
View allSame technique Null Pointer Dereference
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External POC / Exploit Code
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