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Vulnerability record · CVE-2014-6052 · published 15 December 2014

CVE-2014-6052: Libvncserver improper input validation vulnerability

LLibvncserver · Libvncserver

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.

7.5 CVSS 2.0 High EPSS 6.8% · top 6.3% CWE-20 · Improper input validation
7.5CVSS 2.0 base score
6.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
28References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-updates/2015-12/msg00022.html
http://seclists.org/oss-sec/2014/q3/639 Mailing ListThird Party Advisory
http://secunia.com/advisories/61506 Permissions RequiredThird Party Advisory
http://secunia.com/advisories/61682 Permissions RequiredThird Party Advisory
http://ubuntu.com/usn/usn-2365-1 Third Party Advisory
http://www.debian.org/security/2014/dsa-3081 Third Party Advisory
http://www.ocert.org/advisories/ocert-2014-007.html Third Party AdvisoryUS Government Resource
http://www.openwall.com/lists/oss-security/2014/09/25/11 Mailing ListThird Party Advisory
http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html Third Party Advisory
http://www.securityfocus.com/bid/70091
https://github.com/newsoft/libvncserver/commit/85a778c0e45e87e35ee7199f1f25020648e8b812 ExploitIssue TrackingPatch
https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
https://security.gentoo.org/glsa/201507-07
https://usn.ubuntu.com/4587-1/
http://lists.opensuse.org/opensuse-updates/2015-12/msg00022.html
http://seclists.org/oss-sec/2014/q3/639 Mailing ListThird Party Advisory
http://secunia.com/advisories/61506 Permissions RequiredThird Party Advisory
http://secunia.com/advisories/61682 Permissions RequiredThird Party Advisory
http://ubuntu.com/usn/usn-2365-1 Third Party Advisory
http://www.debian.org/security/2014/dsa-3081 Third Party Advisory
http://www.ocert.org/advisories/ocert-2014-007.html Third Party AdvisoryUS Government Resource
http://www.openwall.com/lists/oss-security/2014/09/25/11 Mailing ListThird Party Advisory
http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html Third Party Advisory
http://www.securityfocus.com/bid/70091
https://github.com/newsoft/libvncserver/commit/85a778c0e45e87e35ee7199f1f25020648e8b812 ExploitIssue TrackingPatch
https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
https://security.gentoo.org/glsa/201507-07
https://usn.ubuntu.com/4587-1/

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Source: NIST National Vulnerability Database (record CVE-2014-6052), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.