CVE-2019-8258
CRITICALCVSS 9.8/10EPSS 4.43%
Last modified
CVE-2019-8258 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. UltraVNC revision 1198 has a heap buffer overflow vulnerability in VNC client code which results code execution. This attack appears to be exploitable via network connectivity. EPSS estimates a 4.43% chance of exploitation in the next 30 days.
Description
UltraVNC revision 1198 has a heap buffer overflow vulnerability in VNC client code which results code execution. This attack appears to be exploitable via network connectivity. This vulnerability has been fixed in revision 1199.
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 |
|---|---|---|
| Uvnc | Ultravnc | < 1.2.2.3 |
| Siemens | Sinumerik Access Mymachine\/P2p | < 4.8 |
| Siemens | Sinumerik Pcu Base Win10 Software\/Ipc | < 14.00 |
| Siemens | Sinumerik Pcu Base Win7 Software\/Ipc | <= 12.01 |
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdfThird Party Advisory
- https://www.us-cert.gov/ics/advisories/icsa-20-161-06Third Party Advisory, US Government Resource
- https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdfThird Party Advisory
- https://www.us-cert.gov/ics/advisories/icsa-20-161-06Third Party Advisory, US Government Resource
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2019-8258?
UltraVNC revision 1198 has a heap buffer overflow vulnerability in VNC client code which results code execution. This attack appears to be exploitable via network connectivity. This vulnerability has been fixed in revision 1199.
How severe is CVE-2019-8258?
CVE-2019-8258 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 4.43% probability of exploitation in the next 30 days.
How do I fix CVE-2019-8258?
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.
Related CVEs from 2019
- CVE-2019-8252Adobe Acrobat and Reader versions 2019.012.20035 and earlier…5.5
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- CVE-2019-8254Adobe Photoshop CC versions before 20.0.8 and 21.0.x before …7.8
- CVE-2019-8255Brackets versions 1.14 and earlier have a command injection …9.8
- CVE-2019-8256ColdFusion versions Update 6 and earlier have an insecure in…9.8
- CVE-2019-8257Adobe Acrobat and Reader versions 2019.012.20035 and earlier…9.8
- CVE-2019-8259UltraVNC revision 1198 contains multiple memory leaks (CWE-6…7.5
- CVE-2019-8260UltraVNC revision 1199 has a out-of-bounds read vulnerabilit…
- CVE-2019-8261UltraVNC revision 1199 has a out-of-bounds read vulnerabilit…
- CVE-2019-8262UltraVNC revision 1203 has multiple heap buffer overflow vul…9.8
- CVE-2019-8263UltraVNC revision 1205 has stack-based buffer overflow vulne…6.5
- CVE-2019-8264UltraVNC revision 1203 has out-of-bounds access vulnerabilit…
Are you affected by CVE-2019-8258?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST