CVE-2018-20019
LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple heap out-of-bound write vulnerabilities in VNC client code that can result remote code execution
02 Description
LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple heap out-of-bound write vulnerabilities in VNC client code that can result remote code execution
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 9.64% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 95.4% of scored records. A rank, not a probability.
- NVD base score
- 9.8 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2018-12-19 16:00Z7 YR AGO
- Last updated
- 2024-08-05 11:51Z2 YR AGO
- Reserved
- 2018-12-10
- Assigning CNA
- Kaspersky
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- Data version
- 5.1
- Document digest
- 040e4d9d0bf4e6c7198b596e9788d07546f177992f44975584b1cab250f2898c
05 Affected products
06 References
- www.debian.orgDSA-4383https://www.debian.org/security/2019/dsa-4383
- lists.debian.org[debian-lts-announce] 20181227 [SECURITY] [DLA 1617-1] libvncserver security updatehttps://lists.debian.org/debian-lts-announce/2018/12/msg00017.html
- ics-cert.kaspersky.comhttps://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-029-libvnc-multiple-heap-out-of-bound-vulnerabilities/
- usn.ubuntu.comUSN-3877-1https://usn.ubuntu.com/3877-1/
- security.gentoo.orgGLSA-201908-05https://security.gentoo.org/glsa/201908-05
- lists.debian.org[debian-lts-announce] 20191030 [SECURITY] [DLA 1979-1] italc security updatehttps://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
- usn.ubuntu.comUSN-4547-1https://usn.ubuntu.com/4547-1/
- usn.ubuntu.comUSN-4587-1https://usn.ubuntu.com/4587-1/
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf
07 Fixed in
Debian 12
- libvncserver Fixed in 0.9.11+dfsg-1.2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- libvncserver Fixed in 0.9.11+dfsg-1.2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- libvncserver Fixed in 0.9.11+dfsg-1.2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 14.04 LTS
- libvncserver Fixed in 0.9.9+dfsg-1ubuntu1.4
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- italc Fixed in 1:2.0.2+dfsg1-4ubuntu0.1
- libvncserver Fixed in 0.9.10+dfsg-3ubuntu0.16.04.3
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- italc Fixed in 1:3.0.3+dfsg1-3ubuntu0.1
- libvncserver Fixed in 0.9.11+dfsg-1ubuntu1.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.