VulnerabilityModified
CVE-2019-8258
UltraVNC revision 1198 has a heap buffer overflow vulnerability in VNC client code which results code execution.
CRITICAL 9.8EPSS 4.43%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.43%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 4.43% probability · 91th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-122, CWE-787
- Affected
- uvnc/ultravnc · siemens/sinumerik access mymachine\/p2p · siemens/sinumerik pcu base win10 software\/ipc · siemens/sinumerik pcu base win7 software\/ipc
- Source
- vulnerability@kaspersky.com
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdfThird Party Advisory
- https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-004-ultravnc-heap-based-buffer-overflow/Third 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://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-004-ultravnc-heap-based-buffer-overflow/Third Party Advisory
- https://www.us-cert.gov/ics/advisories/icsa-20-161-06Third Party Advisory, US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.