Buffer overflow in Libvncserver Project
CVE-2016-9942
Heap-based buffer overflow in ultra.c in LibVNCClient in LibVNCServer before 0.9.11 allows remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message with the Ultra type tile, such that the LZO payload decompressed length exceeds what is specified by the tile dimensions.
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: 0.037 (89.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 89.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.037 · newest: 0.037 · change: 0.000
Affected products
- Libvncserver Project — versions 0.9.10
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.securityfocus.com/bid/95170 (vdb-entry)
- github.com/LibVNC/libvncserver/pull/137
- www.debian.org/security/2017/dsa-3753 (vendor-advisory)
- security.gentoo.org/glsa/201702-24 (vendor-advisory)
- github.com/LibVNC/libvncserver/releases/tag/LibVNCServer-0.9.11
- lists.debian.org/debian-lts-announce/2019/10/msg00042.html (mailing-list)
- usn.ubuntu.com/4587-1/ (vendor-advisory)
Frequently asked questions
- What is CVE-2016-9942?
- CVE-2016-9942 is a critical-severity vulnerability in Libvncserver Project, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2016-12-31.
- How severe is CVE-2016-9942?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2016-9942 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.