CVE-2014-6051

CVE-2014-6051 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-189.

Key facts

• Severity: High (CVSS 2.0 base score 7.5)
• EPSS exploit prediction: 8% (94th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-189
• Affected product: Libvncserver
• Published: 2014-09-30
• Last modified: 2026-06-17

Description

Integer overflow in the MallocFrameBuffer function in vncviewer.c in LibVNCServer 0.9.9 and earlier allows remote VNC servers to cause a denial of service (crash) and possibly execute arbitrary code via an advertisement for a large screen size, which triggers a heap-based buffer overflow.

Frequently asked questions

What is CVE-2014-6051?

Integer overflow in the MallocFrameBuffer function in vncviewer.c in LibVNCServer 0.9.9 and earlier allows remote VNC servers to cause a denial of service (crash) and possibly execute arbitrary code via an advertisement for a large screen size, which triggers a heap-based buffer overflow.

How severe is CVE-2014-6051?

CVE-2014-6051 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2014-6051 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2014-6051?

CVE-2014-6051 primarily affects Libvncserver. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2014-6051?

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-2014-6051 published?

CVE-2014-6051 was published on 2014-09-30 and last updated on 2026-06-17.

References

• http://lists.fedoraproject.org/pipermail/package-announce/2014-October/139654.html
• http://lists.fedoraproject.org/pipermail/package-announce/2014-September/139445.html
• http://lists.opensuse.org/opensuse-updates/2015-12/msg00022.html
• http://rhn.redhat.com/errata/RHSA-2015-0113.html
• http://seclists.org/oss-sec/2014/q3/639
• http://secunia.com/advisories/61506
• 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/70093
• https://github.com/newsoft/libvncserver/commit/045a044e8ae79db9244593fbce154cdf6e843273
• https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
• https://security.gentoo.org/glsa/201507-07
• https://security.gentoo.org/glsa/201612-36
• https://usn.ubuntu.com/4587-1/
• https://www.kde.org/info/security/advisory-20140923-1.txt

Affected products (7)

• cpe:2.3:o:redhat:enterprise_linux_server_aus:6.5:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server_eus:6.5.z:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:20:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:21:*:*:*:*:*:*:*
• cpe:2.3:a:libvncserver:libvncserver:*:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
• cpe:2.3:o:oracle:solaris:11.3:*:*:*:*:*:*:*

More vulnerabilities in Libvncserver

• CVE-2014-6052 — High (CVSS 7.5): The HandleRFBServerMessage function in libvncclient/rfbproto.c in LibVNCServer 0.9.9 and earlier does not check certain…
• 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…

All CVEs affecting Libvncserver →

Other CWE-189 (Numeric Errors) vulnerabilities

• CVE-2015-8396 — Critical (CVSS 10.0): Integer overflow in the ImageRegionReader::ReadIntoBuffer function in…
• CVE-2015-7205 — Critical (CVSS 10.0): Integer underflow in the RTPReceiverVideo::ParseRtpPacket function in Mozilla Firefox before 43.0 and Firefox ESR 38.x…
• CVE-2015-6575 — Critical (CVSS 10.0): SampleTable.cpp in libstagefright in Android before 5.1.1 LMY48I does not properly consider integer promotion, which…
• CVE-2015-3864 — Critical (CVSS 10.0): Integer underflow in the MPEG4Extractor::parseChunk function in MPEG4Extractor.cpp in libstagefright in mediaserver in…
• CVE-2015-3836 — Critical (CVSS 10.0): The Parse_wave function in arm-wt-22k/lib_src/eas_mdls.c in the Sonivox DLS-to-EAS converter in Android before 5.1.1…
• CVE-2015-3834 — Critical (CVSS 10.0): Multiple integer overflows in the BnHDCP::onTransact function in media/libmedia/IHDCP.cpp in libstagefright in Android…

Browse all CWE-189 (Numeric Errors) vulnerabilities →