Use after free in LibVNC
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-416 and the CVSS impact.
Summary
LibVNC before commit ca2a5ac02fbbadd0a21fabba779c1ea69173d10b contains heap use-after-free vulnerability in server code of file transfer extension that can result remote code execution.
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 ca2a5ac02fbbadd0a21fabba779c1ea69173d10b | — | No fix listed | CNA |
- LibVNC Vendor— Affected commit ca2a5ac02fbbadd0a21fabba779c1ea69173d10b 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: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: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:a:libvnc_project:libvncserver:*:*:*:*:*:*:*:* Versions before 0.9.12 Vulnerable ·Libvnc Project
- 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
- 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
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-2018-10820 Use after free in LibVNCPriority MEDIUM 56
- TI-2018-14197 Out-of-bounds write in LibVNCPriority MEDIUM 54
- 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-2018-10820 Use after free in LibVNCPriority MEDIUM 56
- TI-2018-14197 Out-of-bounds write in LibVNCPriority MEDIUM 54
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
Not affected: 3 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
Timeline
- 2026-10-02 Threatist record created from CVE-2018-6307
- 2026-10-03 Alias added: GHSA-862p-2jpg-8gg4
References
Advisory 5
Sources
- CVE-2018-6307 · CVE Program
- CVE-2018-6307 · NVD
- FIRST EPSS
- GHSA-862p-2jpg-8gg4 · GitHub Advisory Database · CC BY 4.0
- CVE-2018-6307 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences