CVE-2018-20749

high-risk
Published 2019-01-30

LibVNC before 0.9.12 contains a heap out-of-bounds write vulnerability in libvncserver/rfbserver.c. The fix for CVE-2018-15127 was incomplete.

Do I need to act?

!
10.4% chance of exploitation in next 30 days
EPSS score — higher than 90% of all CVEs
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (14)

Affected Vendors

Debian Siemens Canonical Libvnc Project

References (20)

Broken Link http://www.securityfocus.com/bid/106825
Patch https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf
Patch https://github.com/LibVNC/libvncserver/commit/15bb719c03cc70f14c36a843dcb16ed69b...
Issue Tracking https://github.com/LibVNC/libvncserver/issues/273
Third Party Advisory https://lists.debian.org/debian-lts-announce/2019/01/msg00029.html
Mailing List https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
Third Party Advisory https://usn.ubuntu.com/3877-1/
Third Party Advisory https://usn.ubuntu.com/4547-1/
Third Party Advisory https://usn.ubuntu.com/4587-1/
Exploit https://www.openwall.com/lists/oss-security/2018/12/10/8
Broken Link http://www.securityfocus.com/bid/106825
Patch https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf
Patch https://github.com/LibVNC/libvncserver/commit/15bb719c03cc70f14c36a843dcb16ed69b...
Issue Tracking https://github.com/LibVNC/libvncserver/issues/273
Third Party Advisory https://lists.debian.org/debian-lts-announce/2019/01/msg00029.html
Mailing List https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
Third Party Advisory https://usn.ubuntu.com/3877-1/
Third Party Advisory https://usn.ubuntu.com/4547-1/
Third Party Advisory https://usn.ubuntu.com/4587-1/
Exploit https://www.openwall.com/lists/oss-security/2018/12/10/8
61
/ 100
high-risk
Severity 32/34 · Critical
Exploitability 11/34 · Low
Exposure 18/34 · Moderate