CVE-2019-20788
CRITICALCVSS 9.8/10EPSS 2.44%
Last modified
CVE-2019-20788 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. libvncclient/cursor.c in LibVNCServer through 0.9.12 has a HandleCursorShape integer overflow and heap-based buffer overflow via a large height or width value. NOTE: this may overlap CVE-2019-15690.. EPSS estimates a 2.44% chance of exploitation in the next 30 days.
Description
libvncclient/cursor.c in LibVNCServer through 0.9.12 has a HandleCursorShape integer overflow and heap-based buffer overflow via a large height or width value. NOTE: this may overlap CVE-2019-15690.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Libvnc Project | Libvncserver | <= 0.9.12 |
| Canonical | Ubuntu Linux | 14.04 |
| Canonical | Ubuntu Linux | 16.04 |
| Canonical | Ubuntu Linux | 18.04 |
| Canonical | Ubuntu Linux | 18.10 |
| Debian | Debian Linux | 8.0 |
| Debian | Debian Linux | 9.0 |
| Siemens | Simatic Itc1500 Firmware | >= 3.0.0.0, < 3.2.1.0 |
| Siemens | Simatic Itc1500 Pro Firmware | >= 3.0.0.0, < 3.2.1.0 |
| Siemens | Simatic Itc1900 Firmware | >= 3.0.0.0, < 3.2.1.0 |
| Siemens | Simatic Itc1900 Pro Firmware | >= 3.0.0.0, < 3.2.1.0 |
| Siemens | Simatic Itc2200 Firmware | >= 3.0.0.0, < 3.2.1.0 |
| Siemens | Simatic Itc2200 Pro Firmware | >= 3.0.0.0, < 3.2.1.0 |
References
- http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00027.htmlMailing List, Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdfPatch, Third Party Advisory
- https://github.com/LibVNC/libvncserver/commit/54220248886b5001fbbb9fa73c4e1a2cb9413fedPatch, Third Party Advisory
- https://securitylab.github.com/advisories/GHSL-2020-064-libvnc-libvncclientExploit, Third Party Advisory
- https://usn.ubuntu.com/4407-1/Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00027.htmlMailing List, Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdfPatch, Third Party Advisory
- https://github.com/LibVNC/libvncserver/commit/54220248886b5001fbbb9fa73c4e1a2cb9413fedPatch, Third Party Advisory
- https://securitylab.github.com/advisories/GHSL-2020-064-libvnc-libvncclientExploit, Third Party Advisory
- https://usn.ubuntu.com/4407-1/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2019-20788?
libvncclient/cursor.c in LibVNCServer through 0.9.12 has a HandleCursorShape integer overflow and heap-based buffer overflow via a large height or width value. NOTE: this may overlap CVE-2019-15690.
How severe is CVE-2019-20788?
CVE-2019-20788 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.44% probability of exploitation in the next 30 days.
How do I fix CVE-2019-20788?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2019-20788?
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