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CVE-2021-22893 Ivanti CVE debrief

CVE-2021-22893 is a use-after-free vulnerability in Ivanti Pulse Connect Secure that CISA included in its Known Exploited Vulnerabilities catalog on 2021-11-03. Because it is listed by CISA as known exploited and marked for known ransomware campaign use, organizations should treat remediation as urgent and follow vendor update guidance and CISA’s ED 21-03 requirements.

Vendor
Ivanti
Product
Pulse Connect Secure
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2021-11-03
Original CVE updated
2021-11-03
Advisory published
2021-11-03
Advisory updated
2021-11-03

Who should care

Security teams responsible for Ivanti Pulse Connect Secure, especially organizations exposing the service to the internet or using it for remote access. Incident response, vulnerability management, and identity/network teams should also track this CVE because it is in CISA KEV.

Technical summary

The supplied records identify CVE-2021-22893 as a use-after-free issue affecting Ivanti Pulse Connect Secure. CISA’s KEV entry states the required action is to apply updates per vendor instructions and references ED 21-03 for further guidance. The vulnerability was added to KEV on 2021-11-03 with a due date of 2022-05-03.

Defensive priority

High

Recommended defensive actions

  • Apply Ivanti-provided updates for Pulse Connect Secure as directed by the vendor.
  • Use CISA ED 21-03 guidance to confirm remediation and any required checks.
  • Prioritize exposure review for any internet-facing Pulse Connect Secure deployments.
  • Verify whether affected appliances were present during the remediation window and assess for signs of compromise.
  • Track this CVE in vulnerability and asset inventories as a known exploited issue.

Evidence notes

Evidence is limited to the supplied CISA KEV source item and official links. The record identifies the product as Ivanti Pulse Connect Secure, the vulnerability as a use-after-free, the KEV dateAdded as 2021-11-03, dueDate as 2022-05-03, and knownRansomwareCampaignUse as Known. No CVSS score was provided in the corpus, so no severity score is asserted here.

Official resources

CISA added CVE-2021-22893 to the Known Exploited Vulnerabilities catalog on 2021-11-03 and tied remediation to ED 21-03, with a due date of 2022-05-03.