Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-9030

Severity CVSS v4.0:
MEDIUM
Type:
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Publication date:
07/08/2026
Last modified:
18/08/2026

Description

A denial-of-service<br /> vulnerability exists in httpd service on Archer A6 v4 where the asynchronous systool<br /> instruction handlng path in httpd does not properly synchronize or safely manage<br /> concurrent systool operations.  <br /> <br /> <br /> <br /> <br /> <br /> By sending<br /> crafted systool instructions through the asynchronous request path, successful<br /> exploitation may cause the httpd process or device management service to crash<br /> and may result in temporary loss of access to the web management interface or<br /> device reboot.

Impact

Vector 4.0
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 CVSS v4.0 Severity and Metrics:

Base Score: 6.80 MEDIUM
Vector: 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

Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Attack Requirements (AT): None
Privileges Required (PR): High
User Interaction (UI): None
Confidentiality (VC): None
Integrity (VI): None
Availability (VA): High
Confidentiality (SC): None
Integrity (SI): None
Availability (SA): None

Base Score 4.0
6.80
Severity 4.0
MEDIUM

References to Advisories, Solutions, and Tools