CVE-2025-42940
📋 TL;DR
CVE-2025-42940 is a memory corruption vulnerability in SAP CommonCryptoLib that occurs when parsing manipulated ASN.1 data during pre-authentication. Exploitation can cause application crashes, leading to denial of service. This affects SAP systems using CommonCryptoLib for network communications.
💻 Affected Systems
- SAP CommonCryptoLib
⚠️ 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
Complete unavailability of affected SAP services through repeated crashes, potentially disrupting business operations.
Likely Case
Intermittent service disruptions and application instability when attackers send crafted packets.
If Mitigated
Minimal impact with proper network segmentation and monitoring to detect anomalous traffic patterns.
🎯 Exploit Status
Exploitation requires crafting specific ASN.1 data but doesn't require authentication, making it accessible to attackers with network access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to SAP Note 3633049 for specific patch versions
Vendor Advisory: https://me.sap.com/notes/3633049
Restart Required: Yes
Instructions:
1. Review SAP Note 3633049 for affected versions and patches. 2. Apply the relevant SAP Security Patch Day updates. 3. Restart affected SAP services after patching.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to SAP systems to trusted sources only
Traffic Filtering
allImplement network filtering to block suspicious ASN.1 traffic patterns
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure to trusted sources only
- Monitor for abnormal traffic patterns and application crashes indicative of exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check SAP Note 3633049 to determine if your CommonCryptoLib version is affectedCheck Version:
Check SAP system documentation for CommonCryptoLib version commands specific to your installationVerify Fix Applied:
Verify patch installation through SAP system logs and confirm version updates📡 Detection & Monitoring
Log Indicators:
- Unexpected application crashes
- Memory corruption errors in SAP logs
- Abnormal ASN.1 parsing errors
Network Indicators:
- Unusual network traffic patterns to SAP ports
- Repeated connection attempts with malformed data
SIEM Query:
Search for 'CommonCryptoLib crash' OR 'ASN.1 parsing error' in SAP application logs