CVE-2021-22941Known exploitationPublic exploitNetwork attack vector

Remote code execution via upload path traversal

Published Sep 23, 2021 · Updated Oct 21, 2025

Path traversal in Citrix ShareFile Storage Zones Controller before 5.11.20 allows remote attackers to execute code through an upload request. The NeatUpload UploadHttpModule accepts an unvalidated id or uploadid value as PostBackID, and WritePersistFile uses it in a web-root path. No authentication is required; a crafted multipart upload can overwrite a Razor view, causing attacker-supplied code to run on the IIS server.

CVSS severity9.8
Critical
EPSS probability53.59%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Path traversal in Citrix ShareFile Storage Zones Controller before 5.11.20 allows remote attackers to execute code through an upload request. The NeatUpload UploadHttpModule accepts an unvalidated id or uploadid value as PostBackID, and WritePersistFile uses it in a web-root path. No authentication is required; a crafted multipart upload can overwrite a Razor view, causing attacker-supplied code to run on the IIS server.

The record

CVE
CVE-2021-22941
Published
Sep 23, 2021
Updated
Oct 21, 2025
Vendor
Citrix
Product
ShareFile StorageZones Controller
Classifications
CWE-284, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 23, 2021CVE publishedPublication date reported by the CVE source.
  2. Jan 10, 2022Exploitation reportedPROPHET SPIDER ShareFile exploitation
  3. Mar 25, 2022Exploitation reportedCISA Known Exploited Vulnerabilities listing
  4. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.11.20

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Citrix · ShareFile StorageZones Controllerversion=5.11.20

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0NVDAV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo