Description
UltraVNC revision 1199 has a out-of-bounds read vulnerability in VNC code inside client CoRRE decoder, caused by multiplication overflow. This attack appears to be exploitable via network connectivity. This vulnerability has been fixed in revision 1200.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| UltraVNC | UltraVNC | 1.2.2.3 | — |
Advisories 5
- ICSA-21-131-11 Siemens SIMATIC UltraVNC HMI WinCC Products CISA ICS & IT advisories · May 6, 2025
- ICSA-21-131-04 Siemens SINAMICS Medium Voltage Products Remote Access (Update B) CISA ICS & IT advisories · May 6, 2025
- SSA-286838 SSA-286838: Multiple Vulnerabilities in SINAMICS Medium Voltage Products Siemens ProductCERT · Aug 10, 2021
- SSA-940818 SSA-940818: UltraVNC Vulnerabilities in SIMATIC HMIs/WinCC Products Siemens ProductCERT · May 11, 2021
- ICSA-20-161-06 Siemens SINUMERIK CISA ICS & IT advisories · Jun 9, 2020
References
- https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-007-ultravnc-out-of-bound-read/
- https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf
- https://www.us-cert.gov/ics/advisories/icsa-20-161-06
- https://cert-portal.siemens.com/productcert/pdf/ssa-940818.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-286838.pdf
- https://us-cert.cisa.gov/ics/advisories/icsa-21-131-11