How severe is CVE-2014-6052?

CVE-2014-6052 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2014-6052 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2014-6052?

CVE-2014-6052 primarily affects Libvncserver. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2014-6052?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2014-6052 published?

CVE-2014-6052 was published on 2014-12-15 and last updated on 2026-06-17.

CVE-2014-6052

CVE-2014-6052 is a high-severity vulnerability in Libvncserver with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 7% (93rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Libvncserver
Published: 2014-12-15
Last modified: 2026-06-17

Description

The HandleRFBServerMessage function in libvncclient/rfbproto.c in LibVNCServer 0.9.9 and earlier does not check certain malloc return values, which allows remote VNC servers to cause a denial of service (application crash) or possibly execute arbitrary code by specifying a large screen size in a (1) FramebufferUpdate, (2) ResizeFrameBuffer, or (3) PalmVNCReSizeFrameBuffer message.

Frequently asked questions

What is CVE-2014-6052?: The HandleRFBServerMessage function in libvncclient/rfbproto.c in LibVNCServer 0.9.9 and earlier does not check certain malloc return values, which allows remote VNC servers to cause a denial of service (application crash) or possibly execute arbitrary code by specifying a large screen size in a (1) FramebufferUpdate, (2) ResizeFrameBuffer, or (3) PalmVNCReSizeFrameBuffer message.
How severe is CVE-2014-6052?: CVE-2014-6052 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2014-6052 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2014-6052?: CVE-2014-6052 primarily affects Libvncserver. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2014-6052?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2014-6052 published?: CVE-2014-6052 was published on 2014-12-15 and last updated on 2026-06-17.

References

Affected products (5)

cpe:2.3:a:libvncserver:libvncserver:*:*:*:*:*:*:*:*
cpe:2.3:o:oracle:solaris:11.3:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*

More vulnerabilities in Libvncserver

CVE-2014-6051 — High (CVSS 7.5): Integer overflow in the MallocFrameBuffer function in vncviewer.c in LibVNCServer 0.9.9 and earlier allows remote VNC…
CVE-2006-2450 — High (CVSS 7.5): auth.c in LibVNCServer 0.7.1 allows remote attackers to bypass authentication via a request in which the client…
CVE-2014-6055 — Medium (CVSS 6.5): Multiple stack-based buffer overflows in the File Transfer feature in rfbserver.c in LibVNCServer 0.9.9 and earlier…
CVE-2014-6053 — Medium (CVSS 5.0): The rfbProcessClientNormalMessage function in libvncserver/rfbserver.c in LibVNCServer 0.9.9 and earlier does not…
CVE-2014-6054 — Medium (CVSS 4.3): The rfbProcessClientNormalMessage function in libvncserver/rfbserver.c in LibVNCServer 0.9.9 and earlier allows remote…

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