CVE-2019-8266
Title: Uvnc Ultravnc Memory Corruption
Memory Corruption
Proof Of Concept
PoC Available for CVE-2019-8266
CWE Category
CWE-125
Published Date
Mar 08, 2019
Modified Date
Jun 17, 2026
Exploit Status
Available
Score
9.8
CVSS v3.0
Exploit Probability (EPSS)
2.84%
Vulnerability Summary
CVE-2019-8266: 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.
Impacted Vendors
Reference Links
https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-013-ultravnc-access-of-memory-location-after-end-of-buffer/
https://www.us-cert.gov/ics/advisories/icsa-20-161-06
https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-013-ultravnc-access-of-memory-location-after-end-of-buffer/
https://www.us-cert.gov/ics/advisories/icsa-20-161-06
CVSS v3.0
Source Entity
[email protected]
Severity
CRITICAL
9.8
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v2.0
Source Entity
[email protected]
Severity
HIGH
7.5
Access Vector
N/A
Authentication
N/A
RAW VECTOR
AV:N/AC:L/Au:N/C:P/I:P/A:P
Associated Attack Patterns (CAPEC)
Total: PatternsNo specific attack patterns mapped.
Likelihood
Severity
Page /
CVE-2019-8266 Exploits & PoCs (Proof Of Concept)
GitHub
https://github.com/Matheus-Garbelini/esp32_esp8266_attacks
MODIFIED
Vulnerability data updated via NVD.
MODIFIED
Vulnerability data or affected products updated.
PUBLISHED
Vulnerability first announced in NVD.
Attack Vector Matrix
Access Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
CVSS Vector String
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Stack
No specific products linked.