CVE-2016-9941: n/a vulnerability

CVE-2016-9941: Heap-based buffer overflow in rfbproto.c in LibVNCClient in LibVNCServer before 0.9.11 allows remote server...

Heap-based buffer overflow in rfbproto.c in LibVNCClient in LibVNCServer before 0.9.11 allows remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message containing a subrectangle outside of the client drawing area.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 03:07 UTC (UTC+00:00)

Security readout for executives and security teams

This is a client-side LibVNC vulnerability. If a vulnerable application connects to a malicious or compromised VNC server, the server may crash the client and possibly run code in the client process. The sources identify LibVNCServer before 0.9.11 and downstream Linux advisories, but do not show active exploitation. Exposure is most likely in software embedding LibVNCClient from LibVNCServer before 0.9.11, including packaged Linux applications noted by Debian, Gentoo, and Ubuntu advisories. Server-only deployments are not the primary risk described here. Treat this as a targeted client-side exposure. Patch affected VNC client software, especially in admin workstations or remote-support tooling that may connect to unmanaged systems. Business urgency rises if users routinely connect to external VNC servers. Mitigation focus: Identify software using LibVNCClient or libvncserver packages.; Upgrade LibVNCServer or downstream packages to vendor-fixed versions.; Prioritize clients that connect to third-party or unmanaged VNC servers..

Prepared: Jun 13, 2026, 12:51 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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Execution behavior lookup

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CVE-2016-9941 mapping review

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Dec 31, 2016, 18:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://github.com/LibVNC/libvncserver/pull/137CVE reference · x_refsource_CONFIRM
GLSA-201702-24CVE reference · vendor-advisory, x_refsource_GENTOO
https://github.com/LibVNC/libvncserver/releases/tag/LibVNCServer-0.9.11CVE reference · x_refsource_CONFIRM
[debian-lts-announce] 20191030 [SECURITY] [DLA 1979-1] italc security updateCVE reference · mailing-list, x_refsource_MLIST
USN-4587-1CVE reference · vendor-advisory, x_refsource_UBUNTU

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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