LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper…
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Will not fix Red Hat: no fix planned
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat.
Summary
LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater client code that allows attacker to read stack memory and can be abuse for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and in bypassing ASLR
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | LibVNC | commit 8b06f835e259652b0ff026898014fc7297ade858 | — | No fix listed | CNA |
- LibVNC Vendor— Affected commit 8b06f835e259652b0ff026898014fc7297ade858 Fixed in — No fix listed CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:libvnc_project:libvncserver:*:*:*:*:*:*:*:* | before 0.9.12 | Vulnerable | Libvnc Project |
| cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* | 8.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
| cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* | 14.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* | 16.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* | 18.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:* | 18.10 | Vulnerable | Canonical |
- cpe:2.3:a:libvnc_project:libvncserver:*:*:*:*:*:*:*:* Versions before 0.9.12 Vulnerable ·Libvnc Project
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* Versions 14.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* Versions 16.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:* Versions 18.10 Vulnerable ·Canonical
Remediation
No fixed version listed by the sources yet.
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
LibVNC — USN-3877-1
9 records Highest priority Priority MEDIUM 5 MEDIUM, 4 LOW
Other records, highest priority first
- TI-2018-10821 Out-of-bounds write in LibVNCPriority MEDIUM 58
- TI-2018-04638 Use after free in LibVNCPriority MEDIUM 57
- TI-2018-10820 Use after free in LibVNCPriority MEDIUM 56
- Advisory ·
LibVNC — DSA-4383
9 records Highest priority Priority MEDIUM 5 MEDIUM, 4 LOW
Other records, highest priority first
- TI-2018-10821 Out-of-bounds write in LibVNCPriority MEDIUM 58
- TI-2018-04638 Use after free in LibVNCPriority MEDIUM 57
- TI-2018-10820 Use after free in LibVNCPriority MEDIUM 56
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 8 | Affected | No fix planned: Will not fix |
Not affected: 2 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2018-20023
- 2026-10-03 Alias added: GHSA-h752-h62f-w8j9
References
Advisory 7
Sources
- CVE-2018-20023 · CVE Program
- CVE-2018-20023 · NVD
- FIRST EPSS
- GHSA-h752-h62f-w8j9 · GitHub Advisory Database · CC BY 4.0
- CVE-2018-20023 · Red Hat security data · CC BY 4.0
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