EUVD-2026-54656
GHSA-7f4x-hjwm-h5px
Severity by source
CVSS:4.0/AV:A/AC:L/AT:N/PR:H/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 vector and high privileges required to reach the WRITEOEM handler; crash-only outcome yields availability impact with no confidentiality or integrity loss.
Primary rating from Vendor (TPLink).
CVSS VectorVendor: TPLink
CVSS:4.0/AV:A/AC:L/AT:N/PR:H/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
Lifecycle Timeline
1DescriptionCVE.org
An input validation vulnerability exists in the HTTP-WRITEOEM handler due to insufficient validation of user-supplied data before it is processed by internal flash-write handling logic.
Successful exploitation may cause httpd process or device to crash, resulting in loss of access to the web interface and a denial-of-service condition.
AnalysisAI
Denial-of-service in the TP-Link Archer A6 V4 router's embedded web server allows an authenticated, adjacent-network attacker to crash the httpd process or the device by sending a malformed request to the HTTP-WRITEOEM handler, which fails to validate input before passing it to flash-write logic. All Archer A6 V4 firmware versions prior to V4_1.15.10 Build 260625 Rel.25447 are affected, per EUVD-2026-54656 and TP-Link's own advisory. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two concrete prerequisites: (1) adjacent network access - the attacker must be on the same LAN or WLAN segment as the router, ruling out direct internet-based exploitation; and (2) high-privilege authentication - the attacker must possess valid administrator credentials for the router's web management interface (PR:H per the CVSS 4.0 vector). … 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:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N scores 6.8 (Medium), accurately capturing the constrained threat model: exploitation requires adjacent network positioning (LAN or WLAN, not the open internet) and high-privilege authentication (router administrator credentials). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has obtained router administrator credentials - via credential reuse, phishing, or a prior compromise - and who is present on the same LAN or WLAN as the Archer A6 V4 authenticates to the web management interface, then sends a crafted HTTP request targeting the WRITEOEM handler with malformed input. The flash-write logic processes the unsanitized data, causing the httpd daemon or the router itself to crash and making the web management interface unavailable until the device reboots. … |
| Remediation | TP-Link has released patched firmware V4_1.15.10 Build 260625 Rel.25447 for the Archer A6 V4, downloadable from https://www.tp-link.com/us/support/download/archer-a6/v4/#Firmware (US) or https://www.tp-link.com/en/support/download/archer-a6/v4/#Firmware (EN); the vendor advisory is at https://www.tp-link.com/en/support/faq/5234/. … Detailed patch versions, workarounds, and compensating controls in full report. |
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More in Archer A6 V4
View allSame weakness CWE-20 – Improper Input Validation
View allSame technique Denial Of Service
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External POC / Exploit Code
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