Coverage › CVE-2025-21334

CVE-2025-21334 Mapped Sigma

Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerability

Vendor / product

Microsoft — Windows

Description (CISA)

Microsoft Windows Hyper-V NT Kernel Integration VSP contains a use-after-free vulnerability that allows a local attacker to gain SYSTEM privileges.

Added to KEV

2025-01-14

Due date

2025-02-04

Required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Known ransomware use

Unknown

CWE

CWE-416

CISA notes

https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-21334
https://nvd.nist.gov/vuln/detail/CVE-2025-21334

Elsewhere

cve.org · NVD · CISA KEV · JSON

ATT&CK techniques · CTID Mappings Explorer, ATT&CK 16.1, KEV snapshot 2025-07-28

2 mapping objects across 2 techniques. exploitation technique states how the vulnerability is exploited; primary and secondary impact state what exploitation achieves. They are different claims and are labelled as such.

Detection chain · ATT&CK Enterprise v19.2 detection strategies, analytics, log sources

T1003 OS Credential Dumping primary impact

• DET0234 Credential Dumping via Sensitive Memory and Registry Access Correlation
  AN0648 Windows

  Processes accessing LSASS memory or SAM registry hives outside of trusted security tools, often followed by file creation or lateral movement. Detects unauthorized access to sensitive OS subsystems for credential extraction.

  WinEventLog:Sysmon EventCode=10 → DC0035 Process Access

  WinEventLog:Sysmon EventCode=1 → DC0032 Process Creation

  WinEventLog:Security EventCode=4663, 4670, 4656 → DC0055 File Access

  WinEventLog:Security EventCode=4662 → DC0071 Active Directory Object Access

  Tunable: AccessMask TimeWindow ParentProcessFilter
  AN0649 Linux

  Processes opening /proc//mem or /proc//maps targeting credential-storing services like sshd or login. Behavior often includes high privilege escalation and memory inspection tools such as gcore or gdb.

  auditd:SYSCALL open → DC0055 File Access

  auditd:SYSCALL ptrace → DC0035 Process Access

  auditd:SYSCALL execve → DC0032 Process Creation

  Tunable: TargetProcessName ToolProcessName
  AN0650 macOS

  Unsigned processes accessing system memory or launching known credential scraping tools (e.g., osascript, dylib injections) to access the Keychain or sensitive memory regions.

  macos:unifiedlog Code Execution & Entitlement Access → DC0034 Process Metadata

  macos:keychain Access to Keychain DB or system.keychain → DC0055 File Access

  macos:osquery Invocation of osascript or dylib injection → DC0032 Process Creation

  Tunable: KeychainAccessPath SignedBinaryStatus

Sigma rules tagged attack.t1003 (37)

All 37 rules on the technique page →

T1068 Exploitation for Privilege Escalation exploitation technique

• DET0514 Detection Strategy for Exploitation for Privilege Escalation
  AN1419 Windows

  Detects exploitation attempts targeting vulnerable kernel drivers or OS components, often followed by unusual process or token behavior.

  WinEventLog:Sysmon EventCode=6 → DC0079 Driver Load

  WinEventLog:Sysmon EventCode=1 → DC0032 Process Creation

  WinEventLog:Security EventCode=4672 → DC0088 Logon Session Metadata

  Tunable: DriverNamePattern TimeWindow ParentProcessPath
  AN1420 Linux

  Detects escalation via vulnerable setuid binaries or kernel modules, often chained with unusual access to /proc/kallsyms or /dev/kmem.

  auditd:SYSCALL execve → DC0032 Process Creation

  auditd:SYSCALL ACCESS → DC0035 Process Access

  auditd:SYSCALL dmesg → DC0016 Module Load

  Tunable: SetUIDBinaryList TimeWindow EffectiveUIDThreshold
  AN1421 macOS

  Detects use of vulnerable kernel extensions or entitlements abused via setuid or AppleScript injection chains.

  macos:unifiedlog process:exec and kext load events → DC0032 Process Creation

  macos:endpointsecurity ES_EVENT_TYPE_NOTIFY_KEXTLOAD → DC0016 Module Load

  Tunable: EntitlementList TimeWindow
  AN1422 Containers

  Detects container breakout behavior via exploitation (e.g., DirtyPipe, CVE-2022-0847), followed by host OS interaction or escalated capability assignment.

  auditd:SYSCALL capset or setns → DC0067 Logon Session Creation

  containerd:runtime e.g., containerd, Docker events → DC0091 Container Enumeration

  Tunable: NamespaceEscapePattern TimeWindow

Sigma rules tagged attack.t1068 (31)

All 31 rules on the technique page →