Coverage › CVE-2021-22899

CVE-2021-22899 Mapped Sigma

Ivanti Pulse Connect Secure Command Injection Vulnerability

Vendor / product

Ivanti — Pulse Connect Secure

Description (CISA)

Ivanti Pulse Connect Secure contains a command injection vulnerability that allows remote authenticated users to perform remote code execution via Windows File Resource Profiles.

Added to KEV

2021-11-03

Due date

2022-05-03

Required action

Apply updates per vendor instructions.

Known ransomware use

Unknown

CWE

CWE-77

CISA notes

Reference CISA's ED 21-03 (https://www.cisa.gov/news-events/directives/ed-21-03-mitigate-pulse-connect-secure-product-vulnerabilities) for further guidance and requirements. Note: The due date for addressing this vulnerability aligns with the requirements outlined in ED 21-03. https://nvd.nist.gov/vuln/detail/CVE-2021-22899

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

T1059.003 Windows Command Shell primary impact

• DET0202 Behavioral Detection of Windows Command Shell Execution
  AN0578 Windows

  Detects interactive or scripted abuse of cmd.exe, batch files, or shell invocation chains. Focuses on parent-child relationships (e.g., cmd.exe launched from unusual parents), anomalous command-line parameters, and chaining with discovery, credential access, or lateral movement behaviors.

  WinEventLog:Security EventCode=4688 → DC0032 Process Creation

  WinEventLog:Sysmon EventCode=7 → DC0016 Module Load

  EDR:scriptblock Process Tree + Script Block Logging → DC0029 Script Execution

  Tunable: ParentProcessName TimeWindow CommandLinePattern ScriptStoragePath UserContext

Sigma rules tagged attack.t1059.003 (46)

All 46 rules on the technique page →

T1078 Valid Accounts exploitation technique

• DET0560 Detection of Valid Account Abuse Across Platforms
  AN1543 Windows

  Detection of compromised or misused valid accounts via anomalous logon patterns, abnormal logon types, and inconsistent geographic or time-based activity across Windows endpoints.

  WinEventLog:Security EventCode=4624 → DC0067 Logon Session Creation

  WinEventLog:Security EventCode=4776, 4625 → DC0002 User Account Authentication

  WinEventLog:Sysmon EventCode=1 → DC0032 Process Creation

  Tunable: LogonType TimeWindow GeoIPMismatch
  AN1544 Linux

  Detection of valid account misuse through SSH logins, sudo/su abuse, and service account anomalies outside expected patterns.

  auditd:SYSCALL execve → DC0032 Process Creation

  NSM:Connections sshd or PAM logins → DC0002 User Account Authentication

  Tunable: UserContext HostDensityThreshold LoginMethod
  AN1545 macOS

  Detection of interactive and remote logins by service accounts or users at unusual times, with unexpected child process activity.

  macos:unifiedlog loginwindow, sshd → DC0088 Logon Session Metadata

  macos:unifiedlog exec logs → DC0032 Process Creation

  Tunable: LoginOrigin ProcessTreeDepth
  AN1546 Identity Provider

  Detection of valid account abuse in IdP logs via geographic anomalies, impossible travel, risky sign-ins, and multiple MFA attempts or failures.

  saas:okta Sign-in logs / audit events → DC0002 User Account Authentication

  Tunable: MFAFailureCount RiskScoreThreshold IPGeoVelocity
  AN1547 Containers

  Detection of containerized service accounts or compromised kubeconfigs being used for cluster access from unexpected nodes or IPs.

  kubernetes:audit authentication.k8s.io → DC0002 User Account Authentication

  Tunable: ServiceAccountScope ClusterIPWhitelist

Sigma rules tagged attack.t1078 (56)

All 56 rules on the technique page →