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PatchSiren cyber security CVE debrief

CVE-2021-22941 Citrix CVE debrief

CVE-2021-22941 is an improper access control vulnerability in Citrix ShareFile. CISA added it to the Known Exploited Vulnerabilities catalog on 2022-03-25 and marked it as having known ransomware campaign use. For defenders, this makes ShareFile deployments a time-sensitive patching and verification priority.

Vendor
Citrix
Product
ShareFile
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2022-03-25
Original CVE updated
2022-03-25
Advisory published
2022-03-25
Advisory updated
2022-03-25

Who should care

Citrix ShareFile administrators, patch management teams, and security or incident response teams responsible for ShareFile deployments.

Technical summary

The vulnerability is categorized as an improper access control issue in Citrix ShareFile. In the supplied evidence, CISA identifies it as a Known Exploited Vulnerability and records known ransomware campaign use, so affected environments should be treated as exposed to real-world abuse rather than only theoretical risk.

Defensive priority

High

Recommended defensive actions

  • Identify all Citrix ShareFile deployments in your environment, including any instances managed by third parties.
  • Apply Citrix updates per vendor instructions as directed by CISA.
  • Use the CISA due date of 2022-04-15 as the urgency benchmark when reviewing historical patch compliance or current exposure management.
  • Confirm remediation by verifying the updated ShareFile version and removing or isolating any unsupported or unpatched instances.
  • Review access logs and security telemetry for unusual ShareFile authentication or access patterns consistent with unauthorized access attempts.
  • If exposure is confirmed, follow incident response procedures and assess for related misuse, especially given CISA's 'known ransomware campaign use' classification.

Evidence notes

The supplied corpus shows: CISA KEV entry dateAdded 2022-03-25 and dueDate 2022-04-15; vendorProject Citrix; product ShareFile; vulnerabilityName 'Citrix ShareFile Improper Access Control Vulnerability'; requiredAction 'Apply updates per vendor instructions.' The corpus also marks knownRansomwareCampaignUse as 'Known.' No CVSS score was provided in the supplied data.

Sources and references

Verified primary and authoritative sources

  • CVE-2021-22941 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2021-22941

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2021-22941 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2021-22941

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.