The rfbProcessClientNormalMessage function in libvncserver/rfbserver.c in LibVNCServer…
Priority LOW 33CWE-19Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Partial
- Fix status
- Partial Red Hat: 12 fixed, 1 without a fix
Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat.
Summary
The rfbProcessClientNormalMessage function in libvncserver/rfbserver.c in LibVNCServer 0.9.9 and earlier does not properly handle attempts to send a large amount of ClientCutText data, which allows remote attackers to cause a denial of service (memory consumption or daemon crash) via a crafted message that is processed by using a single unchecked malloc.
Why it matters now
EPSS 0.07254 94th percentileScored 2026-11-07
Fix Partial Red Hat: 2 advisoriesRed Hat: 12 fixed, 1 without a fix
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 · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:libvncserver:libvncserver:*:*:*:*:*:*:*:* | up to 0.9.9 | Vulnerable | Libvncserver |
| cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:* | 12.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* | 14.04 | Vulnerable | Canonical |
| cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Debian |
- cpe:2.3:a:libvncserver:libvncserver:*:*:*:*:*:*:*:* Versions up to 0.9.9 Vulnerable ·Libvncserver
- cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:* Versions 12.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* Versions 14.04 Vulnerable ·Canonical
- cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Debian
Remediation
Red Hat 2 advisories
- RHSA-2014:1827 Released 2014-11-11 · Red Hat rating Moderatekdenetwork security update
- Red Hat Enterprise Linux Client (v. 7) kdenetwork-7:4.10.5-8.el7_0, kdenetwork-common-7:4.10.5-8.el7_0, kdenetwork-kdnssd-7:4.10.5-8.el7_0 +6
- Red Hat Enterprise Linux Client Optional (v. 7) kdenetwork-7:4.10.5-8.el7_0, kdenetwork-devel-7:4.10.5-8.el7_0, kdenetwork-fileshare-samba-7:4.10.5-8.el7_0 +4
- Red Hat Enterprise Linux Server (v. 7) kdenetwork-7:4.10.5-8.el7_0, kdenetwork-common-7:4.10.5-8.el7_0, kdenetwork-devel-7:4.10.5-8.el7_0 +11
- Red Hat Enterprise Linux Server Optional (v. 7) kdenetwork-7:4.10.5-8.el7_0, kdenetwork-fileshare-samba-7:4.10.5-8.el7_0
- Red Hat Enterprise Linux Workstation (v. 7) kdenetwork-7:4.10.5-8.el7_0, kdenetwork-common-7:4.10.5-8.el7_0, kdenetwork-devel-7:4.10.5-8.el7_0 +11
- Red Hat Enterprise Linux Workstation Optional (v. 7) kdenetwork-7:4.10.5-8.el7_0, kdenetwork-fileshare-samba-7:4.10.5-8.el7_0
- RHSA-2014:1826 Released 2014-11-11 · Red Hat rating Moderatelibvncserver security update
- Red Hat Enterprise Linux Client (v. 7) libvncserver-0.9.9-9.el7_0.1
- Red Hat Enterprise Linux Client Optional (v. 7) libvncserver-devel-0.9.9-9.el7_0.1
- Red Hat Enterprise Linux Desktop (v. 6) libvncserver-0.9.7-7.el6_6.1
- Red Hat Enterprise Linux Desktop Optional (v. 6) libvncserver-0.9.7-7.el6_6.1, libvncserver-devel-0.9.7-7.el6_6.1
- Red Hat Enterprise Linux Server (v. 6) libvncserver-0.9.7-7.el6_6.1
- Red Hat Enterprise Linux Server (v. 7) libvncserver-0.9.9-9.el7_0.1
- Red Hat Enterprise Linux Server Optional (v. 6) libvncserver-0.9.7-7.el6_6.1, libvncserver-0.9.7-7.el6_6.1.ppc, libvncserver-devel-0.9.7-7.el6_6.1 +1
- Red Hat Enterprise Linux Server Optional (v. 7) libvncserver-devel-0.9.9-9.el7_0.1
- Red Hat Enterprise Linux Workstation (v. 6) libvncserver-0.9.7-7.el6_6.1
- Red Hat Enterprise Linux Workstation (v. 7) libvncserver-0.9.9-9.el7_0.1
- Red Hat Enterprise Linux Workstation Optional (v. 6) libvncserver-0.9.7-7.el6_6.1, libvncserver-devel-0.9.7-7.el6_6.1
- Red Hat Enterprise Linux Workstation Optional (v. 7) libvncserver-devel-0.9.9-9.el7_0.1
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 5 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2014:1826, RHSA-2014:1827 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2014:1826, RHSA-2014:1827 |
| Red Hat Enterprise Linux Desktop (v. 6) | Fixed | RHSA-2014:1826 |
| Red Hat Enterprise Linux Desktop Optional (v. 6) | Fixed | RHSA-2014:1826 |
| Red Hat Enterprise Linux Server (v. 6) | Fixed | RHSA-2014:1826 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2014:1826, RHSA-2014:1827 |
| Red Hat Enterprise Linux Server Optional (v. 6) | Fixed | RHSA-2014:1826 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2014:1826, RHSA-2014:1827 |
| Red Hat Enterprise Linux Workstation (v. 6) | Fixed | RHSA-2014:1826 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2014:1826, RHSA-2014:1827 |
| Red Hat Enterprise Linux Workstation Optional (v. 6) | Fixed | RHSA-2014:1826 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2014:1826, RHSA-2014:1827 |
Not affected: 1 product
- Red Hat Enterprise Linux 6
Timeline
- 2026-10-02 Threatist record created from CVE-2014-6053
- 2026-10-03 Alias added: GHSA-fcxc-59xc-c54c
References
Advisory 9
Sources
- CVE-2014-6053 · CVE Program
- CVE-2014-6053 · NVD
- FIRST EPSS
- GHSA-fcxc-59xc-c54c · GitHub Advisory Database · CC BY 4.0
- CVE-2014-6053 · Red Hat security data · CC BY 4.0
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