Description
UltraVNC revision 1211 has multiple improper null termination vulnerabilities in VNC server code, which result in out-of-bound data being accessed by remote users. This attack appears to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1212.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Kaspersky Lab | 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-19-022-ultravnc-improper-null-termination/
- 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