CVE-2025-66715 Overview
CVE-2025-66715 is a DLL hijacking vulnerability affecting Axtion ODISSAAS ODIS version 1.8.4. Attackers can execute arbitrary code by placing a crafted Dynamic Link Library (DLL) file in a location where the application loads it during startup or runtime. The flaw is categorized under [CWE-77] as an improper neutralization of special elements used in a command. The vulnerability carries a CVSS 3.1 score of 6.5 and an EPSS probability of 0.211% (percentile 11.31).
Critical Impact
Successful exploitation lets attackers execute arbitrary code within the context of the ODIS application, compromising confidentiality and integrity on affected hosts.
Affected Products
- Axtion ODISSAAS ODIS v1.8.4
- Deployments referenced through the CPE cpe:2.3:a:axtion:odis:*:*:*:*:*:*:*:*
- Endpoints running the vulnerable ODIS client component
Discovery Timeline
- 2026-01-09 - CVE-2025-66715 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-66715
Vulnerability Analysis
Axtion ODIS v1.8.4 loads one or more DLL modules without enforcing a fully qualified path or validating the module's origin. When Windows resolves the DLL name, it follows the standard search order and can load an attacker-controlled library from a writable directory. Once loaded, the malicious DLL runs inside the ODIS process, inheriting its privileges and access. The behavior maps to [CWE-77] because unsanitized module references are treated as trusted commands during process initialization.
Root Cause
The root cause is insecure library loading. The application references DLLs by name rather than by absolute path, and it does not apply SetDefaultDllDirectories or a similar hardened search policy. Any directory in the DLL search path that an attacker can write to becomes a viable hijack location. This includes the application working directory and per-user paths reachable through phishing or supply chain drops.
Attack Vector
An attacker plants a malicious DLL with a filename that matches one of the modules ODIS resolves at load time. When a user launches ODIS, or when the application reloads a component, Windows locates the attacker's DLL first and maps it into the process. The exported entry point then executes attacker code. Delivery paths include drive-by downloads, phishing attachments, shared network folders, and compromised software distribution channels. Additional technical detail is available in the BitSec CVE-2025-66715 Repository.
No verified proof-of-concept code is published. Refer to the BitSec CVE-2025-66715 Repository and the Axtion ODIS Overview for product context.
Detection Methods for CVE-2025-66715
Indicators of Compromise
- Unsigned or unexpected DLL files located next to the ODIS executable or in user-writable directories on the DLL search path.
- ODIS process loading modules from paths outside Program Files or the standard installation directory.
- New DLLs appearing in the ODIS application folder shortly before process launches or crashes.
Detection Strategies
- Monitor image load events (Sysmon Event ID 7) for the ODIS process and alert on modules loaded from non-standard directories.
- Baseline the legitimate DLL set that ships with Axtion ODIS v1.8.4 and flag deviations by hash and path.
- Correlate file creation events in the ODIS install directory with subsequent process starts to detect staging behavior.
Monitoring Recommendations
- Enable PowerShell and command-line logging to capture staging activity that drops DLL payloads.
- Forward endpoint image-load telemetry to a centralized analytics pipeline for retrospective search.
- Alert on ODIS spawning unusual child processes such as cmd.exe, powershell.exe, or rundll32.exe after startup.
How to Mitigate CVE-2025-66715
Immediate Actions Required
- Restrict write permissions on the ODIS installation directory to administrators only.
- Inventory hosts running Axtion ODIS v1.8.4 and prioritize them for remediation.
- Block execution of unsigned DLLs in the ODIS application path using application control policies.
Patch Information
No vendor advisory or fixed version is listed in the NVD entry at the time of publication. Contact Axtion through the Axtion ODIS Overview page for remediation guidance and upgrade availability.
Workarounds
- Deploy Windows Defender Application Control or AppLocker rules that only permit signed DLLs from the vendor to load into the ODIS process.
- Set the SafeDllSearchMode registry value to 1 and use CWDIllegalInDllSearch to remove the current working directory from the search path.
- Run ODIS from a protected directory tree with strict NTFS access control lists and remove user write access.
# Configuration example: enforce safe DLL search order (run as administrator)
reg add "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager" /v SafeDllSearchMode /t REG_DWORD /d 1 /f
reg add "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager" /v CWDIllegalInDllSearch /t REG_DWORD /d 0xFFFFFFFF /f
# Restrict write access to the ODIS install directory
icacls "C:\Program Files\Axtion\ODIS" /inheritance:r /grant:r "Administrators:(OI)(CI)F" "SYSTEM:(OI)(CI)F" "Users:(OI)(CI)RX"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
