Is CVE-2023-40044 in the CISA KEV catalog?

Yes. CVE-2023-40044 is on the CISA Known Exploited Vulnerabilities list, added 2023-10-05, and has known ransomware campaign use.

What is the CVSS severity of CVE-2023-40044?

CVE-2023-40044 has a CVSS v3 base score of 10.0 (CRITICAL).

What is the EPSS score for CVE-2023-40044?

CVE-2023-40044 has an EPSS score of 90.15% (100th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2023-40044

CRITICALCISA KEVEPSS 100th pctl

10.0

CVSS v3

NVD

Description

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.

CWE-502Deserialization of Untrusted Data

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Exploit Intelligence

90.15%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Progress WS_FTP Server Deserialization of Untrusted Data Vulnerability

Progress WS_FTP Server contains a deserialization of untrusted data vulnerability in the Ad Hoc Transfer module that allows an authenticated attacker to execute remote commands on the underlying operating system.

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Remediation due: 2023-10-26

Associated with ransomware campaigns

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-31.