Microsoft Malware Protection Engine
Monthly
Elevation of privilege in the Microsoft Malware Protection Engine (Microsoft Defender), publicly named 'ShieldBreak', allows a locally authenticated low-privileged user to gain high-level system access. The CVSS vector confirms a local, low-complexity attack requiring only low privileges and no user interaction, with full confidentiality, integrity, and availability impact. Proof-of-concept exploit code exists (E:P in the temporal vector), and Microsoft has acknowledged the vulnerability publicly.
Local code execution in Microsoft Defender (Microsoft Malware Protection Engine) allows an unauthorized attacker to run arbitrary code by having a maliciously crafted file processed by the scanning engine. The flaw stems from an integer overflow (CWE-190) that corrupts memory during scanning, yielding full confidentiality, integrity, and availability impact. Reported by Microsoft with a vendor patch available; no public exploit identified at time of analysis.
Local code execution in Microsoft Defender's Malware Protection Engine (mpengine) arises from an integer underflow (CWE-191) that a local attacker can trigger with no prior authentication but requiring user interaction, yielding high confidentiality, integrity, and availability impact. Because Defender's scanning engine runs with SYSTEM-level privileges, successful exploitation would grant full compromise of the host. There is no public exploit identified at time of analysis and the issue is not listed in CISA KEV; Microsoft has released a fix.
Elevation of privilege in the Microsoft Malware Protection Engine (mpengine) - the scanning core shared by Microsoft Defender Antivirus - allows a low-privileged local user, tracked publicly as "RoguePlanet", to gain SYSTEM-level control by abusing how the engine resolves file links (CWE-59). Because the engine runs with the highest privileges, successful exploitation yields total loss of confidentiality, integrity, and availability. Publicly available exploit code exists (MSNightmare/RoguePlanet on GitHub) and SSVC rates technical impact as total, but there is no CISA KEV listing and EPSS is low (0.39%, 30th percentile), indicating no evidence of widespread active exploitation yet.
Remote code execution in Microsoft Defender (Microsoft Malware Protection Engine) enables unauthenticated network-based attackers to corrupt heap memory and run arbitrary code on hosts running the vulnerable scanning engine. The flaw scores CVSS 8.1 with high attack complexity, affects systems by default since Defender is shipped with Windows, and at time of analysis has no public exploit identified, though Microsoft has released a vendor patch via MSRC.
Local privilege escalation in Microsoft Defender (Malware Protection Engine) enables an authenticated low-privileged attacker to elevate to SYSTEM by abusing improper link resolution (CWE-59) before file access. The flaw scores CVSS 7.8 with high impact to confidentiality, integrity, and availability, and no public exploit is identified at time of analysis. Microsoft has released a patch via MSRC, and there is no current CISA KEV listing or EPSS signal indicating active mass exploitation.
Elevation of privilege in the Microsoft Malware Protection Engine (Microsoft Defender), publicly named 'ShieldBreak', allows a locally authenticated low-privileged user to gain high-level system access. The CVSS vector confirms a local, low-complexity attack requiring only low privileges and no user interaction, with full confidentiality, integrity, and availability impact. Proof-of-concept exploit code exists (E:P in the temporal vector), and Microsoft has acknowledged the vulnerability publicly.
Local code execution in Microsoft Defender (Microsoft Malware Protection Engine) allows an unauthorized attacker to run arbitrary code by having a maliciously crafted file processed by the scanning engine. The flaw stems from an integer overflow (CWE-190) that corrupts memory during scanning, yielding full confidentiality, integrity, and availability impact. Reported by Microsoft with a vendor patch available; no public exploit identified at time of analysis.
Local code execution in Microsoft Defender's Malware Protection Engine (mpengine) arises from an integer underflow (CWE-191) that a local attacker can trigger with no prior authentication but requiring user interaction, yielding high confidentiality, integrity, and availability impact. Because Defender's scanning engine runs with SYSTEM-level privileges, successful exploitation would grant full compromise of the host. There is no public exploit identified at time of analysis and the issue is not listed in CISA KEV; Microsoft has released a fix.
Elevation of privilege in the Microsoft Malware Protection Engine (mpengine) - the scanning core shared by Microsoft Defender Antivirus - allows a low-privileged local user, tracked publicly as "RoguePlanet", to gain SYSTEM-level control by abusing how the engine resolves file links (CWE-59). Because the engine runs with the highest privileges, successful exploitation yields total loss of confidentiality, integrity, and availability. Publicly available exploit code exists (MSNightmare/RoguePlanet on GitHub) and SSVC rates technical impact as total, but there is no CISA KEV listing and EPSS is low (0.39%, 30th percentile), indicating no evidence of widespread active exploitation yet.
Remote code execution in Microsoft Defender (Microsoft Malware Protection Engine) enables unauthenticated network-based attackers to corrupt heap memory and run arbitrary code on hosts running the vulnerable scanning engine. The flaw scores CVSS 8.1 with high attack complexity, affects systems by default since Defender is shipped with Windows, and at time of analysis has no public exploit identified, though Microsoft has released a vendor patch via MSRC.
Local privilege escalation in Microsoft Defender (Malware Protection Engine) enables an authenticated low-privileged attacker to elevate to SYSTEM by abusing improper link resolution (CWE-59) before file access. The flaw scores CVSS 7.8 with high impact to confidentiality, integrity, and availability, and no public exploit is identified at time of analysis. Microsoft has released a patch via MSRC, and there is no current CISA KEV listing or EPSS signal indicating active mass exploitation.