Is CVE-2016-9941 in the CISA KEV catalog?

No. CVE-2016-9941 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-9941?

CVE-2016-9941 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2016-9941?

CVE-2016-9941 has an EPSS score of 3.73% (89th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-9941?

Upgrade libvncserver on debian 11 to 0.9.11+dfsg-1 or later. Fixes are available for 9 affected products.

CVE & CISA-KEV Catalog

CVE-2016-9941

CRITICALEPSS 89th pctl

9.8

CVSS v3

NVD

Description

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.

CWE-119Buffer Overflow

How to fix

Remediation Available

libvncserverDebian

Fixed in:0.9.11+dfsg-1CVE-2016-9941

italcUbuntu

Fixed in:1:2.0.2+dfsg1-4ubuntu0.1USN-4587-1

italc-clientUbuntu

Fixed in:1:2.0.2+dfsg1-4ubuntu0.1USN-4587-1

italc-masterUbuntu

Fixed in:1:2.0.2+dfsg1-4ubuntu0.1USN-4587-1

libitalccoreUbuntu

Fixed in:1:2.0.2+dfsg1-4ubuntu0.1USN-4587-1

libvncclient1Ubuntu

Fixed in:0.9.10+dfsg-3ubuntu0.16.04.1USN-3171-1

libvncserverUbuntu

Fixed in:0.9.9+dfsg-1ubuntu1.2USN-3171-1

Fixed in:0.9.10+dfsg-3ubuntu0.16.04.1USN-3171-1

libvncserver0Ubuntu

Fixed in:0.9.9+dfsg-1ubuntu1.2USN-3171-1

libvncserver1Ubuntu

Fixed in:0.9.10+dfsg-3ubuntu0.16.04.1USN-3171-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

3.73%probability of exploitation in 30 days

89thpercentile

Elevated risk: more likely to be exploited than 89% of all known CVEs.

References

Other references7

Related Vulnerabilities

Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-4966	Critical	9.4	100%	KEV + Ransom	Fix
CVE-2017-11882	High	7.8	100%	KEV + Ransom	-
CVE-2020-0796	Critical	10.0	100%	KEV + Ransom	-
CVE-2008-4250	Critical	9.8	99%	KEV	-
CVE-2017-15944	Critical	9.8	98%	KEV	Fix
CVE-2015-0014	High	10.0	97%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.