Security readout for executives and security teams
Plain-English summary
Pulse Connect Secure versions before 9.1R11.4 have a command injection flaw that can let a logged-in remote attacker run code on the VPN appliance through the Windows Resource Profiles feature. Because CISA lists this CVE as known exploited, affected edge VPN systems should be treated as urgent.
Executive priority
Treat this as an urgent edge-appliance remediation item. The combination of remote code execution, VPN placement, and CISA known-exploited status creates high business risk even though attacker authentication is required.
Technical view
CVE-2021-22899 is CWE-77 command injection in Pulse Connect Secure before 9.1R11.4. The published CVSS 3.1 score is 8.8: network reachable, low complexity, low privileges required, no user interaction, with high confidentiality, integrity, and availability impact. The vendor-fixed version is 9.1R11.4.
Likely exposure
Organizations running Pulse Connect Secure before 9.1R11.4 are potentially exposed, especially where the Windows Resource Profiles feature is in use. Exposure is most urgent for internet-facing VPN appliances because they sit at the network edge and often broker privileged access.
Exploitation context
CISA KEV inclusion supports that this CVE has been exploited in the wild. The provided CVE data states exploitation requires authentication, but successful exploitation can lead to remote code execution. The source bundle does not provide exploit volume, affected campaigns, or indicators.
Researcher notes
Evidence supports affected product, fixed version, CVSS vector, CWE-77 classification, authentication requirement, Windows Resource Profiles path, and KEV status. The supplied sources do not include exploit details, indicators of compromise, or non-upgrade mitigations.
Mitigation direction
- Upgrade Pulse Connect Secure to the vendor-fixed 9.1R11.4 release.
- Review Pulse Secure SA44784 for current vendor instructions.
- Prioritize remediation for internet-facing Pulse Connect Secure appliances.
- Inventory appliances using Windows Resource Profiles.
- Check CISA KEV deadlines and internal remediation SLAs.
Validation and detection
- Confirm every Pulse Connect Secure appliance version is 9.1R11.4 or fixed later.
- Identify whether Windows Resource Profiles are configured on each appliance.
- Review authentication and access logs for unusual activity.
- Verify remediation status in vulnerability management records.
- Confirm vendor advisory guidance has been applied.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-77: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-22899 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44784/?kA23Z000000boUWSAYCVE reference · x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22899CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Special Elements used in a Command ('Command Injection')
Improper Neutralization of Special Elements used in a Command ('Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.