LibVNC before 0.9.12 contains a heap out-of-bounds write vulnerability in…
Priority MEDIUM 48CWE-787Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Will not fix Red Hat: no fix planned
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.
Summary
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.
Why it matters now
EPSS 0.0323 88th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Will not fix Red Hat: no fix planned
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 |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 20
| 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:*:*:*:esm:*:*:* | 16.04 | 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:o:siemens:simatic_itc1500_firmware:*:*:*:*:*:*:*:* | 3.0.0.0 to before 3.2.1.0 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:simatic_itc1500:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
- 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:*:*:*:esm:*:*:* Versions 16.04 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
- cpe:2.3:o:siemens:simatic_itc1500_firmware:*:*:*:*:*:*:*:* Versions 3.0.0.0 to before 3.2.1.0 Vulnerable ·Siemens
- cpe:2.3:h:siemens:simatic_itc1500:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
Show 10 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:siemens:simatic_itc1500_pro_firmware:*:*:*:*:*:*:*:* | 3.0.0.0 to before 3.2.1.0 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:simatic_itc1500_pro:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:simatic_itc1900_firmware:*:*:*:*:*:*:*:* | 3.0.0.0 to before 3.2.1.0 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:simatic_itc1900:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:simatic_itc1900_pro_firmware:*:*:*:*:*:*:*:* | 3.0.0.0 to before 3.2.1.0 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:simatic_itc1900_pro:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:simatic_itc2200_firmware:*:*:*:*:*:*:*:* | 3.0.0.0 to before 3.2.1.0 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:simatic_itc2200:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:simatic_itc2200_pro_firmware:*:*:*:*:*:*:*:* | 3.0.0.0 to before 3.2.1.0 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:simatic_itc2200_pro:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
- cpe:2.3:o:siemens:simatic_itc1500_pro_firmware:*:*:*:*:*:*:*:* Versions 3.0.0.0 to before 3.2.1.0 Vulnerable ·Siemens
- cpe:2.3:h:siemens:simatic_itc1500_pro:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:simatic_itc1900_firmware:*:*:*:*:*:*:*:* Versions 3.0.0.0 to before 3.2.1.0 Vulnerable ·Siemens
- cpe:2.3:h:siemens:simatic_itc1900:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:simatic_itc1900_pro_firmware:*:*:*:*:*:*:*:* Versions 3.0.0.0 to before 3.2.1.0 Vulnerable ·Siemens
- cpe:2.3:h:siemens:simatic_itc1900_pro:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:simatic_itc2200_firmware:*:*:*:*:*:*:*:* Versions 3.0.0.0 to before 3.2.1.0 Vulnerable ·Siemens
- cpe:2.3:h:siemens:simatic_itc2200:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:simatic_itc2200_pro_firmware:*:*:*:*:*:*:*:* Versions 3.0.0.0 to before 3.2.1.0 Vulnerable ·Siemens
- cpe:2.3:h:siemens:simatic_itc2200_pro:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Will not fix |
Not affected: 2 products
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
Timeline
- 2026-10-02 Threatist record created from CVE-2018-20749
- 2026-10-03 Alias added: GHSA-r6jv-7mgh-x66r
References
Patch 2
Sources
- CVE-2018-20749 · CVE Program
- CVE-2018-20749 · NVD
- FIRST EPSS
- GHSA-r6jv-7mgh-x66r · GitHub Advisory Database · CC BY 4.0
- CVE-2018-20749 · 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