Is CVE-2017-18922 in the CISA KEV catalog?

No. CVE-2017-18922 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-18922?

CVE-2017-18922 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2017-18922?

CVE-2017-18922 has an EPSS score of 2.26% (81th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-18922?

Upgrade libvncserver on debian 11 to 0.9.12+dfsg-3 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2017-18922

CRITICALEPSS 81th pctl

9.8

CVSS v3

NVD

Description

It was discovered that websockets.c in LibVNCServer prior to 0.9.12 did not properly decode certain WebSocket frames. A malicious attacker could exploit this by sending specially crafted WebSocket frames to a server, causing a heap-based buffer overflow.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

libvncserverDebian

Fixed in:0.9.12+dfsg-3CVE-2017-18922

libvncclient1Ubuntu

Fixed in:0.9.10+dfsg-3ubuntu0.16.04.4USN-4407-1

Fixed in:0.9.11+dfsg-1ubuntu1.2USN-4407-1

Fixed in:0.9.12+dfsg-9ubuntu0.1USN-4407-1

libvncserverUbuntu

Fixed in:0.9.10+dfsg-3ubuntu0.16.04.4USN-4407-1

Fixed in:0.9.11+dfsg-1ubuntu1.2USN-4407-1

Fixed in:0.9.12+dfsg-9ubuntu0.1USN-4407-1

libvncserver1Ubuntu

Fixed in:0.9.10+dfsg-3ubuntu0.16.04.4USN-4407-1

Fixed in:0.9.11+dfsg-1ubuntu1.2USN-4407-1

Fixed in:0.9.12+dfsg-9ubuntu0.1USN-4407-1

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

Exploit Intelligence

2.26%probability of exploitation in 30 days

81stpercentile

Elevated risk: more likely to be exploited than 81% of all known CVEs.

References

Patch3

Third-Party Advisory8

Other references2

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix

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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 2024-11-21.