CVE-2019-8266
CRITICALUltraVNC < 1.2.2.3 - Out-of-bounds Read via ClientConnection::Copybuffer
Title source: llmDescription
UltraVNC revision 1207 has multiple out-of-bounds access vulnerabilities connected with improper usage of ClientConnection::Copybuffer function in VNC client code, which can potentially result in code execution. This attack appears to be exploitable via network connectivity. User interaction is required to trigger these vulnerabilities. These vulnerabilities have been fixed in revision 1208.
References (3)
Core 3
Core References
Third Party Advisory x_refsource_misc
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-013-ultravnc-access-of-memory-location-after-end-of-buffer/
Vendor Advisory x_refsource_confirm
https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf
Various Sources x_refsource_misc
https://www.us-cert.gov/ics/advisories/icsa-20-161-06
Scores
CVSS v3
9.8
EPSS
0.0284
EPSS Percentile
84.8%
Attack Vector
NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Details
CWE
CWE-125
CWE-787
CWE-788
Status
published
Products (1)
uvnc/ultravnc
< 1.2.2.3
Published
Mar 08, 2019
Tracked Since
Feb 18, 2026