Login Request a demo
Critical severity · published Mar 5, 2019
CVE-2019-8261
UltraVNC revision 1199 has a out-of-bounds read vulnerability in VNC code inside client CoRRE decoder, caused by multiplication overflow
9.8
CVSS
2.2%
EPSS
No
On KEV
Description
UltraVNC revision 1199 has a out-of-bounds read vulnerability in VNC code inside client CoRRE decoder, caused by multiplication overflow. This attack appears to be exploitable via network connectivity. This vulnerability has been fixed in revision 1200.
CVSS vector
CVSS:3.0/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)2.2% · higher than 83% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
UL
UltraVNC · UltraVNC
1.2.2.3 · source: vendor, NVD
Affected product
UL
UltraVNC
UltraVNC
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-8261
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-8261
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/pdf/ssa-286838.pdf
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/pdf/ssa-940818.pdf
Third Party Advisory
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-007-ultravnc-out-of-bound-read/
us-cert.cisa.gov
https://us-cert.cisa.gov/ics/advisories/icsa-21-131-11
www.us-cert.gov
https://www.us-cert.gov/ics/advisories/icsa-20-161-06
More from UltraVNC
9.8
CVE-2019-8258
UltraVNC revision 1198 has a heap buffer overflow vulnerability in VNC client code which results code execution
9.8
CVE-2019-8262
UltraVNC revision 1203 has multiple heap buffer overflow vulnerabilities in VNC client code inside Ultra decoder, which results in code execution
9.8
CVE-2019-8260
UltraVNC revision 1199 has a out-of-bounds read vulnerability in VNC client RRE decoder code, caused by multiplication overflow
9.8
CVE-2018-15361
UltraVNC revision 1198 has a buffer underflow vulnerability in VNC client code, which can potentially result in code execution
7.5
CVE-2019-8259
UltraVNC revision 1198 contains multiple memory leaks (CWE-655) in VNC client code, which allow an attacker to read stack memory and can be abused for information disclosure