Home/CVE/Ivanti Pulse Connect Secure Use-After-Free Vulnerability
CVE

CVE-2021-22893

Ivanti Pulse Connect Secure Use-After-Free Vulnerability

Pulse Connect Secure 9.0R3/9.1R1 and higher is vulnerable to an authentication bypass vulnerability exposed by the Windows File Share Browser and Pulse Secure Collaboration features of Pulse Connect Secure that can allow an unauthenticated user to perform remote arbitrary code execution on the Pulse Connect Secure gateway. This vulnerability has been exploited in the wild.

CRITICAL · CVSS 10 ⚠ CISA KEV EPSS 0.93607 Ransomware: known
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • Linked to known ransomware campaigns
  • SSVC exploitation status: active
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 0% of all CVEs by exploitation likelihood
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules10 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

◆

Threat Actors Linked

3
actorAPT5 (UNC2630 / UNC2717 / Mulberry Typhoon)
actorKOSTOVITE
actorREvil
⬡

Weakness Classification

CWE-287Improper Authentication
CWE-416Use After Free
▤

Affected Products & Versions

1
ivanti connect secureall versions
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Detection Rules (IDS/IPS)

3
et-openET EXPLOIT [FIREEYE] Suspicious Pulse Secure HTTP Request (CVE-2021-22893) M1attempted-admin
et-openET EXPLOIT [FIREEYE] Suspicious Pulse Secure HTTP Request (CVE-2021-22893) M2attempted-admin
et-openET EXPLOIT [FIREEYE] Suspicious Pulse Secure HTTP Request (CVE-2021-22893) M3trojan-activity
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
◈

Sigma Hunt Rules

10
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
relatedcriticalAntivirus Password Dumper Detection
relatedcriticalHacktool Execution - Imphash
relatedcriticalHackTool - Rubeus Execution
relatedcriticalPotential Credential Dumping Via LSASS Process Clone
relatedcriticalWCE wceaux.dll Access
relatedcriticalHackTool - Dumpert Process Dumper Default File
▣

Scoring & Timeline

10
CRITICAL · CVSS v3.1 · support@hackerone.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD23 Apr 2021 · 05:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
cisaKEV-CVE-2021-22893
🔗

References & Sources

6
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://blog.pulsesecure.net/pulse-connect-secure-security-update/Vendor Advisory
https://kb.cert.org/vuls/id/213092Third Party AdvisoryUS Government Resource
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44784/Broken LinkVendor Advisory
https://www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.htmlThird Party Advisory
https://www.kb.cert.org/vuls/id/213092US Government Resource
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22893US Government Resource
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