Threats / CrushFTP / CVE-2025-54309
CVE-2025-54309
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-08-04
CrushFTP vulnerability
CrushFTP fails to properly validate AS2 channels when DMZ proxy is disabled, allowing remote attackers to bypass authentication and gain administrative access over HTTPS.
Verdict
Today item — known-exploited.
An unprotected alternate channel vulnerability in CrushFTP's AS2 validation logic enables unauthenticated remote attackers to obtain admin-level access when the DMZ proxy feature is not configured, creating a direct path to system compromise.
CISA KEV Yes · 2025-07-225EPSS 0.92034 (verify live)6Exploit Weaponized · public PoC7CVSS 93CISA SSVC Exploitation: active · Automatable: no · Impact: total4
01
Is it exploitable?
— the evidence, ranked above the scoreExploit available
Fully weaponized — public exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
79 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-07-22).
Probability (EPSS)
EPSS 0.92034 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H) · Affected: CrushFTP, CrushFTP. Confirm exact fixed builds in the vendor advisory.CVSS — CNA-assigned (CVE.org), version 3.1, set at disclosure.
Weakness (CWE)
Mapped to CWE-420 CWE-420.CWE — CNA-assigned (CVE.org); the weakness class drives how the flaw is exploited.
CISA SSVC (triage disposition)
Exploitation: active · Automatable: no · Technical Impact: totalCISA's own stakeholder-specific triage inputs, published in the CVE record (CISA Coordinator role). NOTE: this is CISA's three decision points; the final Act/Attend/Track decision also requires a Mission & Well-being input not published here, so no overall decision is asserted.
Currency of the record
CISA added this to its KEV catalog 4 days after the CVE record was published.KEV lag = CISA-KEV dateAdded − CVE.org datePublished; a floor on how long the known-exploited flaw sat in the public record before the federal catalog listed it. Severity/weakness here is CNA- or CISA-assigned (current at disclosure), independent of NVD's analysis backlog.
WeaknessCWE-420 · CWE-420
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I identify that CrushFTP is deployed without DMZ proxy protection.
Business
Deployment misconfiguration leaves the AS2 validation mechanism exposed to direct network access.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I send crafted HTTPS requests that exploit the unvalidated AS2 alternate channel.
Business
The application fails to authenticate my requests due to improper channel validation logic.
3
Lateral reach — past segmentation narrative 3
Attacker
I gain administrative access to the CrushFTP instance without valid credentials.
Business
An attacker obtains full control over file transfer operations, user accounts, and system configuration.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05