Security readout for executives and security teams
Plain-English summary
Pulse Connect Secure appliances before 9.1R11.4 contain a buffer overflow that can let a logged-in remote attacker run code as root. Because CISA lists CVE-2021-22894 in KEV, treat affected internet-facing VPN systems as actively targeted and business-critical to remediate.
Executive priority
Treat this as urgent for any Pulse Connect Secure deployment. It affects remote access infrastructure, has root-level impact, and is in CISA KEV. Patch or verify non-exposure before routine maintenance windows where possible.
Technical view
The CVE describes a network-reachable, low-complexity vulnerability requiring low privileges and no user interaction. A maliciously crafted meeting room can trigger arbitrary code execution as root on vulnerable Pulse Connect Secure versions before 9.1R11.4. The CVSS v3.1 score is 8.8 with high confidentiality, integrity, and availability impact.
Likely exposure
Organizations using Pulse Connect Secure before 9.1R11.4 are exposed, especially if the appliance is internet-facing or supports remote authenticated users. The source bundle does not identify affected CPEs or specific deployment configurations beyond Pulse Connect Secure.
Exploitation context
Active exploitation is supported by CISA KEV listing for CVE-2021-22894. The vulnerability requires authentication, but successful exploitation can provide root-level code execution on a remote access appliance, making compromised credentials or low-privilege access materially dangerous.
Researcher notes
Evidence supports authenticated remote code execution through a malicious meeting room object on Pulse Connect Secure before 9.1R11.4. Public bundle details do not include exploit mechanics, indicators of compromise, or compensating controls beyond vendor guidance and the fixed version.
Mitigation direction
- Upgrade Pulse Connect Secure to 9.1R11.4 or later.
- Review Pulse Secure advisory SA44784 for vendor-specific guidance.
- Prioritize internet-facing appliances and remote access gateways.
- Restrict appliance access until remediation is complete where operationally feasible.
- Review privileged accounts and remote access logs for suspicious activity.
Validation and detection
- Inventory Pulse Connect Secure appliances and record exact versions.
- Confirm no appliance remains below 9.1R11.4.
- Check whether affected systems are internet-facing.
- Review logs for unusual authenticated meeting room activity.
- Track remediation against CISA KEV status and vendor advisory guidance.
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-94: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process 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-2021-22894 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-2021-22894CVE 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 Control of Generation of Code ('Code Injection')
Improper Control of Generation of Code ('Code Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.