What’s Vulnerable › Vulnerabilities

CVE-2014-6052

• Severity: high (CVSS 7.5 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 6.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2014-12-15 · updated 2026-06-17
• Weakness: CWE-20

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.

Affected products

• Canonical Ubuntu Linux: 12.04, 14.04
• Debian Linux: 7.0
• Libvncserver: through 0.9.9
• Oracle Corporation Solaris Operating System: 11.3

References

• http://lists.opensuse.org/opensuse-updates/2015-12/msg00022.html
• http://seclists.org/oss-sec/2014/q3/639
• http://secunia.com/advisories/61506
• http://secunia.com/advisories/61682
• http://ubuntu.com/usn/usn-2365-1
• http://www.debian.org/security/2014/dsa-3081
• http://www.ocert.org/advisories/ocert-2014-007.html
• http://www.openwall.com/lists/oss-security/2014/09/25/11
• http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
• http://www.securityfocus.com/bid/70091
• https://github.com/newsoft/libvncserver/commit/85a778c0e45e87e35ee7199f1f25020648e8b812
• https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html

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