CVE-2025-65079
📋 TL;DR
A heap-based buffer overflow vulnerability in the Postscript interpreter of Lexmark devices allows attackers to execute arbitrary code as an unprivileged user. This affects various Lexmark printer and multifunction devices that process Postscript files. Attackers could potentially gain control of affected devices.
💻 Affected Systems
- Various Lexmark printers and multifunction devices
⚠️ 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
Full device compromise allowing attacker to install persistent malware, pivot to internal networks, or use device as part of botnet.
Likely Case
Local privilege escalation leading to device control, data exfiltration from scanned documents, or denial of service.
If Mitigated
Limited impact if devices are isolated from internet and have strict network access controls.
🎯 Exploit Status
Requires ability to send Postscript files to device, which could be via print jobs, scanned documents, or web interface uploads.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Lexmark security advisory for specific firmware versions
Vendor Advisory: https://www.lexmark.com/en_us/solutions/security/lexmark-security-advisories.html
Restart Required: Yes
Instructions:
1. Visit Lexmark security advisory page. 2. Identify affected device models. 3. Download latest firmware from Lexmark support portal. 4. Apply firmware update following manufacturer instructions. 5. Verify update completion and restart device.
🔧 Temporary Workarounds
Disable Postscript processing
allDisable Postscript interpreter if not required for business needs
Check device web interface > Settings > Print Features > Disable Postscript
Network segmentation
allIsolate printers on separate VLAN with restricted access
🧯 If You Can't Patch
- Segment printers on isolated network segments with strict firewall rules
- Implement print job auditing and monitor for suspicious Postscript file processing
🔍 How to Verify
Check if Vulnerable:
Check device model and firmware version against Lexmark advisory listCheck Version:
Access device web interface > Settings > About or use SNMP query: snmpget -v2c -c public <printer_ip> 1.3.6.1.2.1.25.6.3.1.2Verify Fix Applied:
Verify firmware version matches or exceeds patched version from advisory📡 Detection & Monitoring
Log Indicators:
- Multiple failed Postscript processing attempts
- Unusual print job submissions
- Firmware modification alerts
Network Indicators:
- Unexpected network connections from printer
- Postscript files sent to printer from unusual sources
SIEM Query:
source="printer_logs" AND (event="postscript_error" OR event="firmware_alert")