CrushFTP Unprotected Alternate Channel Vulnerability
CrushFTP · CrushFTP
CrushFTP's AS2 validation flaw affects CrushFTP 10 before 10.8.5 and 11 before 11.3.4_23 when the DMZ proxy feature is not in use. An attacker with network access to the HTTPS interface can gain administrative access without authentication or user interaction.
CrushFTP 10 before 10.8.5 and 11 before 11.3.4_23, when the DMZ proxy feature is not used, mishandles AS2 validation and consequently allows remote attackers to obtain admin access via HTTPS, as exploited in the wild in July 2025.
- Exploited
- Yes, in CISA KEV
- Reports
- 0
- Tactics
- 3/15
How an attack unfolds
Based on MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. mappings. Select a step to see the evidence.Exploitation timelineDated milestones for a CVE: when it was disclosed, when exploit code became public, when exploitation was confirmed, and when threat reports named it.
First seen exploited the day it was disclosed. Public exploit code (PoC-in-GitHub) appeared 38 days after disclosure.
- Added to CISA KEVEU database agrees+4 days
- Public exploit codePoC-in-GitHub+38 days
CISA KEV listing is when exploitation was confirmed, not necessarily the first attack.
MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. techniques
3 TechniqueOne specific attacker behaviour in MITRE ATT&CK, such as T1190 “Exploit Public-Facing Application”. IDs with a dot, like T1059.004, are sub-techniques., grouped by TacticThe attacker’s goal at a stage of an attack in MITRE ATT&CK, such as Initial Access or Persistence. Each technique belongs to one or more tactics. in kill-chain order 3Privilege EscalationTA0004
Improper validation of AS2 messages in CrushFTP without DMZ proxy enabled were reported to be exploited to bypass authentication and gain administrative access over HTTPS, leading to system compromise, data exfiltration, and lateral movement.
Lateral MovementTA0008
ExfiltrationTA0010
Detection
1 rule for this CVE · 54 general rules for its techniquesRules for this CVE
1Sigma ruleAn open, vendor-neutral detection rule for log data. Security teams convert Sigma rules into searches for their own SIEM. that reference CVE-2025-54309 directly.General rules for this CVE’s techniques
These detect the technique in general, not this specific vulnerability.
Exploitation for Privilege EscalationT106831 general rules
- Exploiting CVE-2019-1388criticalstable
- Audit CVE Eventcriticaltest
- HackTool - SysmonEOP Executioncriticaltest
- InstallerFileTakeOver LPE CVE-2021-41379 File Create Eventcriticaltest
- Possible Coin Miner CPU Priority Paramcriticaltest
- Potential CVE-2021-41379 Exploitation Attemptcriticaltest
- Potential SystemNightmare Exploitation Attemptcriticaltest
- Sudo Privilege Escalation CVE-2019-14287 - Builtincriticaltest
Exfiltration Over Web ServiceT156712 general rules
- Monero Crypto Coin Mining Pool Lookuphighstable
- Communication To Ngrok Tunneling Service - Linuxhightest
- Communication To Ngrok Tunneling Service Initiatedhightest
- Process Initiated Network Connection To Ngrok Domainhightest
- Arbitrary File Download Via ConfigSecurityPolicy.EXEmediumtest
- LOLBAS Data Exfiltration by DataSvcUtil.exemediumtest
- Network Connection Initiated To BTunnels Domainsmediumtest
- Network Connection Initiated To Cloudflared Tunnels Domainsmediumtest
Remote ServicesT102111 general rules
- New RDP Connection Initiated From Domain Controllerhightest
- OpenCanary - FTP Login Attempthightest
- OpenCanary - SMB File Open Requesthightest
- OpenCanary - SNMP OID Requesthightest
- OpenCanary - SSH Login Attempthightest
- OpenCanary - SSH New Connection Attempthightest
- OpenCanary - VNC Connection Attempthightest
- Privilege Escalation via Named Pipe Impersonationhightest
Sigma rules © SigmaHQ, Detection Rule License 1.1; linked, not reproduced.
What security researchers reported
Not named in any threat report yetAlso mentioned in 50 community threat pulses (AlienVault OTX)
Weaker evidencePulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.
- Actively_Exploited_Kev | Oct 30, 202629 Oct 2026
- Actively_Exploited_Kev | Oct 29, 202628 Oct 2026
- Actively_Exploited_Kev | Oct 28, 202627 Oct 2026
- Actively_Exploited_Kev | Oct 27, 202626 Oct 2026
- Actively_Exploited_Kev | Oct 24, 202623 Oct 2026
- Actively_Exploited_Kev | Oct 23, 202622 Oct 2026
- 44 more on OTX