What’s Vulnerable › Vulnerabilities
CVE-2019-8263
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 2.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2019-03-05 · updated 2026-06-17
- Weakness: CWE-121
Description
UltraVNC revision 1205 has stack-based buffer overflow vulnerability in VNC client code inside ShowConnInfo routine, which leads to a denial of service (DoS) condition. This attack appear to be exploitable via network connectivity. User interaction is required to trigger this vulnerability. This vulnerability has been fixed in revision 1206.
Affected products
- Siemens Sinumerik Access Mymachine/P2P: before 4.8 — fixed in 4.8
- Siemens Sinumerik Pcu Base Win10 Software/Ipc: before 14.00 — fixed in 14.00
- Siemens Sinumerik Pcu Base Win7 Software/Ipc: through 12.01
- Kaspersky Lab UltraVNC: before 1.2.2.3 — fixed in 1.2.2.3
How to fix
Upgrade to a fixed version: Siemens Sinumerik Access Mymachine/P2P 4.8; Siemens Sinumerik Pcu Base Win10 Software/Ipc 14.00; Kaspersky Lab UltraVNC 1.2.2.3. Check the vendor advisory for mitigations.
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-286838.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-940818.pdf
- https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-009-ultravnc-access-of-memory-location-after-end-of-buffer/
- https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-010-ultravnc-stack-based-buffer-overflow/
- https://us-cert.cisa.gov/ics/advisories/icsa-21-131-11
- https://www.us-cert.gov/ics/advisories/icsa-20-161-06
- https://cert-portal.siemens.com/productcert/pdf/ssa-286838.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-940818.pdf
- https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-009-ultravnc-access-of-memory-location-after-end-of-buffer/
- https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-010-ultravnc-stack-based-buffer-overflow/
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