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Vulnerability details: VCID-34tt-yamf-xbdy
Vulnerability ID VCID-34tt-yamf-xbdy
Aliases CVE-2017-18922
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 8.8
Risk 4.4
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-787 Out-of-bounds Write
CWE-122 Heap-based Buffer Overflow
System Score Found at
cvssv3 9.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2017-18922.json
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
epss 0.0298 https://api.first.org/data/v1/epss?cve=CVE-2017-18922
cvssv3.1 8.1 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 7.5 https://nvd.nist.gov/vuln/detail/CVE-2017-18922
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2017-18922
Reference id Reference type URL
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00020.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00028.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00033.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00055.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00066.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2017-18922.json
https://api.first.org/data/v1/epss?cve=CVE-2017-18922
https://bugzilla.redhat.com/show_bug.cgi?id=1852356
https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-18922
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/LibVNC/libvncserver/commit/aac95a9dcf4bbba87b76c72706c3221a842ca433
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4F6FUH4EFK4NAP6GT4TQRTBKWIRCZLIY/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NVP7TJVYJDXDFRHVQ3ENEN3H354QPXEZ/
https://www.openwall.com/lists/oss-security/2020/06/30/2
http://www.openwall.com/lists/oss-security/2020/06/30/3
cpe:2.3:a:libvncserver_project:libvncserver:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:libvncserver_project:libvncserver:*:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*
CVE-2017-18922 https://nvd.nist.gov/vuln/detail/CVE-2017-18922
RHSA-2020:3281 https://access.redhat.com/errata/RHSA-2020:3281
RHSA-2020:3385 https://access.redhat.com/errata/RHSA-2020:3385
RHSA-2020:3456 https://access.redhat.com/errata/RHSA-2020:3456
RHSA-2020:3588 https://access.redhat.com/errata/RHSA-2020:3588
USN-4407-1 https://usn.ubuntu.com/4407-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2017-18922.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2017-18922
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2017-18922
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.86003
EPSS Score 0.0298
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:42:19.800257+00:00 Ubuntu USN Importer Import https://usn.ubuntu.com/4407-1/ 37.0.0