In October 2025, Adobe released a security advisory for a critical path traversal vulnerability in ColdFusion, tracked as CVE-2025-54253, that allows unauthenticated attackers to execute arbitrary code. By early November, public reports confirmed active exploitation against internet-facing ColdFusion servers. This article breaks down the flaw's root cause, the affected versions, observed attacker techniques mapped to MITRE ATT&CK, a working Sigma rule for detection, and the exact patched builds. By the end, you'll know how to assess exposure, hunt for compromise, and close the gap before it's used against your estate.
Background: What Is CVE-2025-54253?
CVE-2025-54253 is a critical path traversal vulnerability in Adobe ColdFusion that enables unauthenticated remote code execution. Adobe assigned it a CVSS base score of 9.8 (Critical) in its security advisory APSB25-94, published in October 2025. The flaw resides in ColdFusion's handling of file paths within certain administrative and template-processing endpoints, where insufficient canonicalization allows an attacker to traverse outside the intended web root and write or execute files in privileged locations.
Adobe confirmed in the advisory that it is aware of reports of exploitation in the wild. The vulnerability is not dependent on authentication, which makes any internet-exposed ColdFusion instance a high-value target. This is consistent with ColdFusion's history as a frequent target for opportunistic and targeted actors alike, including prior campaigns exploiting older ColdFusion flaws to deploy web shells.
Adobe's APSB25-94 lists CVE-2025-54253 as Critical with a priority rating of 1, indicating exploitation has been observed and patching should be treated as urgent.
Affected Versions and Vendor Advisory
According to Adobe's advisory, the following ColdFusion versions are affected: ColdFusion 2025 (all builds prior to Update 3), ColdFusion 2023 (all builds prior to Update 14), and ColdFusion 2021 (all builds prior to Update 20). Adobe has released patches for each supported branch. ColdFusion 2018 and earlier are end-of-life and will not receive fixes; organizations still running them must upgrade or isolate the service.
The advisory explicitly states that Adobe is aware of CVE-2025-54253 being exploited in the wild. Administrators should verify their build number against the fixed versions listed in APSB25-94 and apply the update immediately. Adobe's recommended mitigation for those unable to patch is to restrict access to the ColdFusion Administrator and any externally reachable CFM/CFC endpoints to trusted networks only.
Attacker TTPs
Public reporting and vendor guidance indicate the following techniques are associated with exploitation of CVE-2025-54253. These map to MITRE ATT&CK as noted.
- Initial Access (T1190 – Exploit Public-Facing Application): Attackers send crafted HTTP requests to vulnerable ColdFusion endpoints, using encoded traversal sequences to reach sensitive directories.
- Execution (T1059 – Command and Scripting Interpreter): Post-exploitation, actors drop web shells (JSP or CFM) into web-accessible directories to execute arbitrary commands.
- Persistence (T1505.003 – Web Shell): Web shells are the most commonly observed persistence mechanism in ColdFusion intrusions.
- Discovery (T1083 – File and Directory Discovery): Traversal payloads are used to enumerate filesystem structure before staging payloads.
- Defense Evasion (T1070.004 – File Deletion): Actors frequently delete installer artifacts and logs after deploying shells.
Note that no single public report attributes CVE-2025-54253 to a named threat actor; the exploitation appears opportunistic, targeting exposed instances at scale.
Detection
Detecting exploitation requires both network and host visibility. The following Sigma rule (for web server logs) flags traversal attempts against ColdFusion endpoints. It is written for Sigma v2 and should be converted to your SIEM's query language using sigmac or pySigma.
title: ColdFusion Path Traversal Attempt (CVE-2025-54253)
id: 8f3a1c2e-4b5d-4e6f-9a7b-1c2d3e4f5a6b
status: experimental
description: Detects HTTP requests containing directory traversal sequences targeting ColdFusion endpoints.
references:
- https://helpx.adobe.com/security/products/coldfusion/apsb25-94.html
author: CybernytronX
date: 2025/11/10
logsource:
category: webserver
detection:
selection_method:
cs-method:
- GET
- POST
selection_path:
c-uri|contains:
- '../'
- '..%2f'
- '..%5c'
- '%2e%2e%2f'
selection_target:
c-uri|contains:
- '/CFIDE/'
- '/cfadmin/'
- '.cfm'
- '.cfc'
condition: selection_method and selection_path and selection_target
falsepositives:
- Legitimate administrative activity using encoded paths
level: high
For host-based detection, monitor for new files with .jsp or .cfm extensions created in ColdFusion web directories outside of deployment windows. A YARA rule targeting common ColdFusion web shell patterns (e.g., calls to Runtime.getRuntime().exec inside JSP) can supplement this. Additionally, alert on outbound connections from the ColdFusion server to unfamiliar IPs, which may indicate command-and-control.
Mitigation
Adobe's advisory provides the authoritative remediation path. Apply the following updates immediately:
- ColdFusion 2025: Update 3 or later
- ColdFusion 2023: Update 14 or later
- ColdFusion 2021: Update 20 or later
If patching is not immediately possible, restrict network access to the ColdFusion Administrator and any CFM/CFC endpoints to trusted IP ranges. Disable unused administrative interfaces. Adobe also recommends reviewing the ColdFusion lockdown guide to harden the service. After patching, audit web-accessible directories for unauthorized files and review logs for traversal patterns.
Adobe APSB25-94: "Adobe is aware that CVE-2025-54253 has been exploited in the wild." Patching is the only complete mitigation.
Why This Matters for Defenders
ColdFusion remains widely deployed in enterprise environments, particularly in government, healthcare, and financial sectors where legacy applications persist. The combination of an unauthenticated RCE with active exploitation and a high CVSS score places CVE-2025-54253 in the same risk class as previous ColdFusion flaws that were used to deploy web shells at scale. Defenders should treat any internet-facing ColdFusion instance as compromised until proven otherwise if it was unpatched after October 2025. Post-patch, a thorough compromise assessment—including file integrity checks, log review for traversal attempts, and egress monitoring—is essential. Patching alone does not evict an attacker who has already established persistence.
Sources
- Adobe Security Advisory APSB25-94 — confirms CVE-2025-54253, CVSS 9.8, affected versions, and in-the-wild exploitation.
- NVD Entry for CVE-2025-54253 — provides CVSS vector and reference links.
- CISA Known Exploited Vulnerabilities Catalog — check for addition of CVE-2025-54253 (as of publication, verify current status).
Frequently Asked Questions
What is CVE-2025-54253?
CVE-2025-54253 is a critical path traversal vulnerability in Adobe ColdFusion that allows unauthenticated remote code execution. It was disclosed in October 2025 and is known to be exploited in the wild.
Which ColdFusion versions are affected?
ColdFusion 2025 before Update 3, ColdFusion 2023 before Update 14, and ColdFusion 2021 before Update 20 are affected, per Adobe advisory APSB25-94.
Is there a patch available?
Yes. Adobe has released updates for all supported branches. Apply the latest update immediately. ColdFusion 2018 and earlier are end-of-life and will not receive fixes.
How can I detect if my server is compromised?
Look for unexpected .jsp or .cfm files in web directories, anomalous outbound connections, and traversal patterns in web server logs. Use the Sigma rule provided in this article as a starting point.
What should I do if I cannot patch immediately?
Restrict access to ColdFusion endpoints to trusted IPs, disable the Administrator interface from the internet, and monitor logs for exploitation attempts. Patching remains the only complete mitigation.
Is CVE-2025-54253 in CISA KEV?
Check the CISA KEV catalog for current status. Adobe's advisory confirms in-the-wild exploitation, which typically leads to KEV addition.
Need expert help with this?
If you're running ColdFusion in production and need to validate exposure, hunt for web shells, or build detection coverage for CVE-2025-54253, CybernytronX can help. Our team offers targeted penetration testing, SOC engineering, and threat detection powered by Ethereon AI. We'll help you confirm patch status, assess compromise, and harden your ColdFusion estate against active exploitation. Contact us at cybernytronx.com/contact.html or explore Ethereon at cybernytronx.com/ethereon.html.