Vulnerability

CVE-2023-40044

Critical· 10.0KEVEXPLOITCVSS10EPSS94%

.rules3/5

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.

Threat signal

100/100

Severe

Severity

critical

CVSS

10.0

EPSS

94%

Active

KEV

CISA KEV — actively exploited

Ransomware: Known961d overdue

AffectedProgress — WS_FTP Server

Added to KEV

2023-10-05

Federal patch due (BOD 22-01)

2023-10-26

Required action (CISA verbatim)

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

Vendor advisory + references

CISA description: “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.”

CVSS

v3.1Open in FIRST calculator →

10.0/ 10CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack VectorNetworkExploitable remotely over the internet — no local access needed.
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredNoneUnauthenticated — no credentials needed.
User InteractionNoneFully automated — no victim action needed.
ScopeChangedImpact extends beyond the vulnerable component (e.g. sandbox escape).
Confidentiality ImpactHighTotal disclosure of sensitive data.
Integrity ImpactHighTotal compromise of integrity — full data modification possible.
Availability ImpactHighTotal loss of availability — full DoS possible.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

94.4%

probability of exploitation in next 30 days

p100

higher than 100% of all CVEs

3-day trend↑ 0pp

Statistically about to be weaponized — top-tier triage urgency.

Vendor VEX

No VEX statements published for CVE-2023-40044. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCAct

Active exploitation with total impact on essential/support systems

exploitation: active
automatable: yes
impact: total
mission: support

Lifecycle

2023-10-05Added to CISA KEVransomware: Known
2023-10-05Public exploit observedmetasploit
2023-10-05Published
2023-10-26Federal patch due (BOD 22-01)
2026-06-12Last modified1 source

Mentions in news & research

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.