Critical severity · published Mar 8, 2019
CVE-2019-8268
UltraVNC revision 1206 has multiple off-by-one vulnerabilities in VNC client code connected with improper usage of ClientConnection::ReadString function, which can potentially…
9.8
CVSS
3.9%
EPSS
No
On KEV
Description
UltraVNC revision 1206 has multiple off-by-one vulnerabilities in VNC client code connected with improper usage of ClientConnection::ReadString function, which can potentially result code execution. This attack appears to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1207.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)3.9% · higher than 90% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
UL
UltraVNC · Kaspersky Lab
1.2.2.3 · source: vendor, NVD
SA
Sinumerik Access Mymachine/p2p · Siemens
before 4.8 · source: NVD
SP
Sinumerik Pcu Base Win10 Software/ipc · Siemens
before 14.00 · source: NVD
SP
Sinumerik Pcu Base Win7 Software/ipc · Siemens
through 12.01 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-8268
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-8268
Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf
Third Party Advisory
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-015-ultravnc-off-by-one-error/
Third Party Advisory
https://www.us-cert.gov/ics/advisories/icsa-20-161-06
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