CVE-2025-40914
📋 TL;DR
CVE-2025-40914 is an integer overflow vulnerability in Perl CryptX's embedded libtommath library that could allow attackers to execute arbitrary code or cause denial of service. This affects systems using CryptX versions before 0.087 for cryptographic operations. The vulnerability stems from the same underlying issue as CVE-2023-36328 in libtommath.
💻 Affected Systems
- Perl CryptX
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Denial of service through application crashes or memory corruption affecting cryptographic functionality.
If Mitigated
Limited impact with proper network segmentation, minimal attack surface, and updated dependencies.
🎯 Exploit Status
Exploitation requires triggering the integer overflow in specific cryptographic operations. The underlying libtommath vulnerability (CVE-2023-36328) has known technical details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: CryptX 0.087 and later
Vendor Advisory: https://github.com/advisories/GHSA-j3xv-6967-cv88
Restart Required: Yes
Instructions:
1. Update CryptX to version 0.087 or later using CPAN: 'cpan CryptX' 2. Restart any Perl applications or services using CryptX 3. Verify the update with 'perl -MCryptX -e "print $CryptX::VERSION"'
🔧 Temporary Workarounds
Disable CryptX Usage
allTemporarily disable or remove CryptX from applications if not critically needed
cpan -u CryptX
perl -MCPAN -e 'CPAN::Shell->notest("uninstall", "CryptX")'
🧯 If You Can't Patch
- Implement network segmentation to isolate systems using CryptX
- Apply strict input validation and sanitization for all data passed to CryptX functions
🔍 How to Verify
Check if Vulnerable:
Check CryptX version with: perl -MCryptX -e "print $CryptX::VERSION"Check Version:
perl -MCryptX -e "print $CryptX::VERSION"Verify Fix Applied:
Verify version is 0.087 or higher and test cryptographic operations function normally📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory corruption errors
- Unexpected termination of Perl processes using cryptography
Network Indicators:
- Unusual network traffic to/from systems running Perl applications
SIEM Query:
source="*perl*" AND ("segmentation fault" OR "memory corruption" OR "CryptX")