CVE-2026-55012
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk40th percentile - higher than 40% of all known CVEs
Summary
An integer overflow or wraparound vulnerability has been discovered in Microsoft Defender. This flaw allows an unauthorized attacker to execute code locally.
Risk Assessment
An attacker could gain unauthorized access to the system and execute malicious code, potentially leading to full device compromise and data theft.
Recommendation
It is recommended to immediately apply the security update provided by Microsoft for Microsoft Defender. Additionally, regularly monitor the system for suspicious activities.
Other vulnerabilities in Microsoft Defender
See all- CVE-2026-45498MediumActively exploited
Microsoft Defender Denial of Service Vulnerability.
- CVE-2026-41091HighActively exploited
Improper link resolution before file access ('link following') in Microsoft Defender allows an authorized attacker to elevate privileges locally.
- CVE-2026-33825HighActively exploited
Insufficient granularity of access control in Microsoft Defender allows an authorized attacker to elevate privileges locally.
- CVE-2021-42298High
Remote code execution vulnerability in Microsoft Defender. An attacker could exploit this vulnerability to execute arbitrary code on the system.
- CVE-2021-1647HighActively exploited
Microsoft Defender contains a remote code execution vulnerability. Details of the vulnerability are not provided in the description.
- CVE-2026-70264Medium
Improper link resolution before file access ('link following') in Microsoft Defender allows an authorized attacker to disclose information locally.
- CVE-2026-105726Medium
Out-of-bounds read in Microsoft Defender allows an authorized attacker to disclose information locally. The flaw results from reading data beyond the intended memory boundary.
- CVE-2026-50658High
A Time-of-check time-of-use (TOCTOU) race condition in Microsoft Defender allows an authorized attacker to elevate privileges locally.
- CVE-2026-50657Medium
In Microsoft Defender, exposure of private personal information to an unauthorized actor allows an authorized attacker to disclose information locally.
- CVE-2026-55011High
An integer underflow (wrap or wraparound) vulnerability in Microsoft Defender allows an unauthorized attacker to execute code locally.
Original NVD description (English source)
Integer overflow or wraparound in Microsoft Defender allows an unauthorized attacker to execute code locally.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS