Threats / CrushFTP / CVE-2025-54309
CVE-2025-54309
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
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.
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
74 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
Affected: CrushFTP, CrushFTP. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-420 CWE-420.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
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