Windows Defender Firewall Vulnerabilities Let Attackers Escalate Privileges
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Microsoft has addressed four elevation of privilege vulnerabilities in its Windows Defender<\/a> Firewall service, all rated as \u201cImportant\u201d in severity.<\/p>\n The security flaws were detailed in Microsoft\u2019s September 9, 2025, security update release. If exploited, these vulnerabilities could allow an authenticated attacker to gain higher privileges on an affected system.<\/p>\n The four vulnerabilities are tracked as CVE-2025-53808, CVE-2025-54104, CVE-2025-54109, and CVE-2025-54915. All four enable a local attacker to escalate their privileges, posing a significant risk to system integrity. <\/p>\n At the time of disclosure, Microsoft stated that none of the vulnerabilities had been publicly disclosed or actively exploited in the wild.<\/p>\n Three of the four vulnerabilities (CVE-2025-54104, CVE-2025-54109<\/a>, and CVE-2025-54915<\/a>) are caused by a \u201ctype confusion\u201d flaw within the Windows Defender Firewall Service.<\/p>\n Type confusion is a common class of memory safety bug where a program attempts to access a resource with an incompatible type, leading to unexpected and often insecure behavior. In this case, it allows an authorized attacker to trigger a condition that leads to local privilege escalation.<\/p>\n The fourth vulnerability, CVE-2025-53808<\/a>, is also a service elevation of privilege flaw, though Microsoft\u2019s advisory does not specify it as a type confusion bug.<\/p>\n The common thread among all four is the potential outcome: a low-privileged user gaining elevated system rights.<\/p>\n To exploit any of these vulnerabilities, an attacker must first have authenticated access to the target machine. Furthermore, exploitation requires the attacker\u2019s account to be a member of a specific, restricted user group. <\/p>\n This high prerequisite is reflected in the CVSS metric \u201cPrivileges Required: High (PR:H),\u201d indicating that a casual or unauthenticated attacker cannot leverage these flaws.<\/p>\n A successful exploit would allow the attacker to elevate their privileges from a \u201cMedium Integrity Level\u201d to \u201cLocal Service.\u201d <\/p>\n While not full system or administrator-level control, gaining Local Service privileges provides significant capabilities, allowing an attacker to access and manipulate a wide range of system resources, install malicious software, or further compromise the affected host.<\/p>\n Microsoft\u2019s exploitability assessment indicates that an attack is \u201cLess Likely\u201d for CVE-2025-53808, CVE-2025-54104, and CVE-2025-54109. <\/p>\n For CVE-2025-54915, the assessment is even lower, at \u201cExploitation Unlikely.\u201d This analysis is based on the high privileges required for an attacker to be in a position to exploit the flaws.<\/p>\n Despite the low likelihood of exploitation, the \u201cImportant\u201d severity rating underscores the potential danger if an attacker meets the necessary prerequisites. <\/p>\n Microsoft has released security updates to patch these vulnerabilities across all affected versions of Windows. <\/p>\n System administrators and users are strongly advised to apply the September 2025 security updates<\/a> promptly to protect their systems and mitigate the risk of potential privilege escalation attacks.<\/p>\n Find this Story Interesting! Follow us on Google News<\/a>,\u00a0LinkedIn<\/a>,\u00a0and\u00a0X<\/a>\u00a0to Get More Instant Updates<\/strong>.<\/p>\n The post Windows Defender Firewall Vulnerabilities Let Attackers Escalate Privileges<\/a> appeared first on Cyber Security News<\/a>.<\/p>\n<\/div>\nWindows Defender Firewall Vulnerabilities<\/strong><\/h2>\n
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