CVE-2019-20840
7.5 · HIGHOverview
CVE-2019-20840 is a high-severity vulnerability affecting libvnc_project libvncserver. It was published on June 17, 2020 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a crash because of unaligned accesses in hybiReadAndDecode.
Remediation
Check the references section for vendor advisories and patches from libvnc_project. Update libvncserver to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| libvnc_project | libvncserver | 0 | Affected |
| siemens | simatic_itc1500_firmware | >= 3.0.0.0, < 3.2.1.0 | Affected |
| siemens | simatic_itc1500_pro_firmware | >= 3.0.0.0, < 3.2.1.0 | Affected |
| siemens | simatic_itc1900_firmware | >= 3.0.0.0, < 3.2.1.0 | Affected |
| siemens | simatic_itc1900_pro_firmware | >= 3.0.0.0, < 3.2.1.0 | Affected |
| siemens | simatic_itc2200_firmware | >= 3.0.0.0, < 3.2.1.0 | Affected |
| siemens | simatic_itc2200_pro_firmware | >= 3.0.0.0, < 3.2.1.0 | Affected |
References
Frequently Asked Questions
What is CVE-2019-20840?
CVE-2019-20840 is a high-severity vulnerability affecting libvnc_project libvncserver. It was published on June 17, 2020 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2019-20840?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2019-20840?
Check the references section for vendor advisories and patches from libvnc_project. Update libvncserver to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2019-20840?
CyberStrike's AI-powered security agents can automatically detect CVE-2019-20840 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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