Heap-based buffer overflow in rfbproto.c in LibVNCClient in LibVNCServer before 0.9.11…
Priority MEDIUM 48CWE-119Published · 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 3.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-119 and the CVSS impact.
Summary
Heap-based buffer overflow in rfbproto.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 containing a subrectangle outside of the client drawing area.
Why it matters now
EPSS 0.03732 89th percentileScored 2026-11-07
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 · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:libvncserver_project:libvncserver:*:*:*:*:*:*:*:* | up to 0.9.10 | Vulnerable | Libvncserver Project |
- cpe:2.3:a:libvncserver_project:libvncserver:*:*:*:*:*:*:*:* Versions up to 0.9.10 Vulnerable ·Libvncserver Project
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Will not fix |
Timeline
- 2026-10-02 Threatist record created from CVE-2016-9941
- 2026-10-03 Alias added: GHSA-96f2-683j-mrm6
References
More Libvncserver Project Libvncserver vulnerabilities
- TI-2026-25316 LibVNCServer UltraZip Encoding Heap Out-of-bounds Read CVSS 4.0MEDIUM 6.9
- TI-2026-25317 LibVNCServer httpd proxy NULL Pointer Dereference CVSS 4.0MEDIUM 6.3
- TI-2018-05234 An issue was discovered in LibVNCServer through 0.9.11. CVSS 3.0CRITICAL 9.8
- TI-2016-08054 Heap-based buffer overflow in ultra.c in LibVNCClient in LibVNCServer before 0.9.11… CVSS 3.0CRITICAL 9.8
- TI-2017-14070 It was discovered that websockets.c in LibVNCServer prior to 0.9.12 did not properly… CVSS 3.1CRITICAL 9.8
- TI-2020-11267 An issue was discovered in LibVNCServer before 0.9.13. CVSS 3.1HIGH 7.5
Sources
- CVE-2016-9941 · CVE Program
- CVE-2016-9941 · NVD
- FIRST EPSS
- GHSA-96f2-683j-mrm6 · GitHub Advisory Database · CC BY 4.0
- CVE-2016-9941 · Red Hat security data · CC BY 4.0
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