Exploitation evidence
Known exploited · CISA KEV listed
Added 2023-10-05. Ransomware campaign use: Known.
CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA due date: 2023-10-26. This is the catalog’s deadline, not an assessment of your organization’s exposure.
KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗Reported products and versions
Progress Software Corporation / WS_FTP Server
Default status: affected
- affected: 8.8.0 to < 8.8.2 (semver)
- affected: 8.7.0 to < 8.7.4 (semver)
Fixes and workarounds
No explicit solution text in the downloaded CVE record. Consult the vendor advisory; unaffected version ranges are shown above as reported, not inferred as a patch recommendation.
Sources and related reporting
CVE Program record ↗ · Download tracked evidence as JSON
- https://www.progress.com/ws_ftp
- https://community.progress.com/s/article/WS-FTP-Server-Critical-Vulnerability-September-2023
- https://www.theregister.com/2023/10/02/ws_ftp_update/
- https://www.rapid7.com/blog/post/2023/09/29/etr-critical-vulnerabilities-in-ws_ftp-server/
- https://attackerkb.com/topics/bn32f9sNax/cve-2023-40044
- https://censys.com/cve-2023-40044/
- https://www.assetnote.io/resources/research/rce-in-progress-ws-ftp-ad-hoc-via-iis-http-modules-cve-2023-40044
- http://packetstormsecurity.com/files/174917/Progress-Software-WS_FTP-Unauthenticated-Remote-Code-Execution.html
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-40044
Observed change timeline
History begins when Egret first downloads each source. It is not the complete upstream CVE history.
12 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-12",
"epss": 0.90355,
"percentile": 0.99802
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.90355,
"percentile": 0.99801
}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.90355,
"percentile": 0.99801
}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-08",
"epss": 0.90355,
"percentile": 0.99801
}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-07",
"epss": 0.90355,
"percentile": 0.99801
}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-06",
"epss": 0.90355,
"percentile": 0.99801
}06 Nov 2026, 06:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.90355,
"percentile": 0.998
}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.90355,
"percentile": 0.998
}04 Nov 2026, 18:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
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"timestamp": "2025-02-03T16:29:04.428335Z",
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"credits": [
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"user": "00000000-0000-4000-9000-000000000000",
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],
"datePublic": "2023-09-27T14:47:00.000Z",
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}
],
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],
"impacts": [
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"metrics": [
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"baseScore": 10,
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"confidentialityImpact": "HIGH",
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"scope": "CHANGED",
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},
{
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{
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},
{
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"source": {
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"cveId": "CVE-2023-40044",
"datePublished": "2023-09-27T14:48:08.190Z",
"dateReserved": "2023-08-08T19:44:41.112Z",
"dateUpdated": "2025-10-21T23:05:36.645Z",
"state": "PUBLISHED"
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}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.90355,
"percentile": 0.99799
}03 Nov 2026, 02:22 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-02",
"epss": 0.90355,
"percentile": 0.99799
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2023-40044",
"cwes": [
"CWE-502"
],
"dateAdded": "2023-10-05",
"dueDate": "2023-10-26",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Known",
"notes": "https://community.progress.com/s/article/WS-FTP-Server-Critical-Vulnerability-September-2023; https://nvd.nist.gov/vuln/detail/CVE-2023-40044",
"product": "WS_FTP Server",
"requiredAction": "Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.",
"shortDescription": "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.",
"vendorProject": "Progress",
"vulnerabilityName": "Progress WS_FTP Server Deserialization of Untrusted Data Vulnerability"
}