Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 90.1%; technical severity is CVSS 8.8.
In WS_FTP Server versions prior to 8.7.4 and 8.8.2, a pre-authenticated attacker could leverage a .NET deserialization vulnerability in the Ad Hoc Transfer module to execute remote commands on the underlying WS_FTP Server operating system.
Who should care
- Teams operating WS_FTP Server
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether WS_FTP Server is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Vendor remediation
Patch and remediation links
Use the vendor source below to confirm the correct fixed version, package or mitigation for your affected product.
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-502
- Affected versions
- Progress WS_FTP Server (Start Including: 8.8, End Excluding: 8.8.2)
- Published
- 27 September 2023
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 90.1%
- Signal calculated at 86
External references
- Government advisory from www.cisa.gov
- Exploit information from packetstormsecurity.com
- Third-party advisory from attackerkb.com
- Third-party advisory from censys.com
- Vendor advisory from community.progress.com
- Exploit information from www.assetnote.io
- Technical reference from www.progress.com
- Third-party advisory from www.rapid7.com
- Third-party advisory from www.theregister.com