Out-of-bounds Read in Ultravnc
CVE-2019-8261
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.022 (82.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 82.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: 0.000
Affected products
- Ultravnc — versions 1.2.2.3
- Uvnc Ultravnc
Weakness classification (CWE)
References
- ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-007-ul… (Third Party Advisory)
- cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf
- www.us-cert.gov/ics/advisories/icsa-20-161-06
- cert-portal.siemens.com/productcert/pdf/ssa-940818.pdf
- cert-portal.siemens.com/productcert/pdf/ssa-286838.pdf
- us-cert.cisa.gov/ics/advisories/icsa-21-131-11
Frequently asked questions
- What is CVE-2019-8261?
- CVE-2019-8261 is a critical-severity vulnerability in Ultravnc, classified under Out-of-bounds Read. CVSS score: 9.8/10. Published 2019-03-05.
- How severe is CVE-2019-8261?
- Critical severity. CVSS v3 base score is 9.8 out of 10.