CVE-2021-22941

CRITICALNVD 9.89.8—Trending — 4 sources updated this weekExploited in the wild

9.8

Improper Access Control in Citrix ShareFile storage zones controller before 5.11.20 may allow an unauthenticated attacker to remotely compromise the storage zones controller.

CVSS v3: 9.8
EG Score: 9.8(high)
EPSS: 99.5%
KEV: ⚠ Exploited

Published

September 23, 2021

Last Modified

November 3, 2025

Advisory Details (2)

Auto-updated May 26, 2026

⚠️ Active exploitation confirmed. Patch available. Sources: cisa.

cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22941

generic

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https://support.citrix.com/article/CTX328123

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-04 02:34 UTCEG score recompute
2026-06-04 02:34 UTCGHSA enrichment
2026-06-03 22:25 UTCEG score recompute
2026-06-03 22:25 UTCGHSA enrichment
2026-06-03 19:09 UTCkev_newly_listed
2026-06-03 18:16 UTCEG score recompute
2026-06-03 18:16 UTCGHSA enrichment
2026-06-03 14:07 UTCEG score recompute
2026-06-03 14:07 UTCGHSA enrichment
2026-06-03 09:58 UTCEG score recompute
2026-06-03 09:58 UTCGHSA enrichment
2026-06-03 05:49 UTCEG score recompute
2026-06-03 05:49 UTCGHSA enrichment
2026-06-03 01:40 UTCEG score recompute
2026-06-03 01:40 UTCGHSA enrichment
2026-06-02 21:32 UTCEG score recompute
2026-06-02 21:32 UTCGHSA enrichment
2026-06-02 18:32 UTCkev_newly_listed
2026-06-02 17:23 UTCEG score recompute
2026-06-02 17:23 UTCGHSA enrichment

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

GitHub PoChoav18/CVE-2021-22941
First seen Oct 12, 2021
Open source ↗

Frequently asked(6)

What is CVE-2021-22941?

CVE-2021-22941 is a critical vulnerability published on September 23, 2021. Improper Access Control in Citrix ShareFile storage zones controller before 5.11.20 may allow an unauthenticated attacker to remotely compromise the storage zones controller.

When was CVE-2021-22941 disclosed?

CVE-2021-22941 was first published in the National Vulnerability Database on September 23, 2021, with the most recent update on November 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-22941 actively exploited?

Yes. CISA added CVE-2021-22941 to the Known Exploited Vulnerabilities catalog on March 25, 2022, affecting Citrix ShareFile. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.

What is the CVSS score of CVE-2021-22941?

CVE-2021-22941 has a CVSS v3 base score of 9.8 (NVD).

Which products are affected by CVE-2021-22941?

CVE-2021-22941 affects Citrix ShareFile. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.

How do I remediate CVE-2021-22941?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-22941, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-22941

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Is Your Infrastructure Affected by CVE-2021-22941?

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CVE-2021-22941

📅 Published

🔄 Last Modified

📋 Advisory Details (2)