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Vulnerability details: VCID-srhc-1ujp-57ay
Vulnerability ID VCID-srhc-1ujp-57ay
Aliases CVE-2018-20750
Summary LibVNC through 0.9.12 contains a heap out-of-bounds write vulnerability in libvncserver/rfbserver.c. The fix for CVE-2018-15127 was incomplete.
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 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-20750.json
epss 0.08185 https://api.first.org/data/v1/epss?cve=CVE-2018-20750
epss 0.08185 https://api.first.org/data/v1/epss?cve=CVE-2018-20750
epss 0.08185 https://api.first.org/data/v1/epss?cve=CVE-2018-20750
epss 0.08185 https://api.first.org/data/v1/epss?cve=CVE-2018-20750
epss 0.08185 https://api.first.org/data/v1/epss?cve=CVE-2018-20750
epss 0.08185 https://api.first.org/data/v1/epss?cve=CVE-2018-20750
epss 0.08185 https://api.first.org/data/v1/epss?cve=CVE-2018-20750
epss 0.08185 https://api.first.org/data/v1/epss?cve=CVE-2018-20750
epss 0.08185 https://api.first.org/data/v1/epss?cve=CVE-2018-20750
epss 0.08185 https://api.first.org/data/v1/epss?cve=CVE-2018-20750
epss 0.08185 https://api.first.org/data/v1/epss?cve=CVE-2018-20750
epss 0.08185 https://api.first.org/data/v1/epss?cve=CVE-2018-20750
epss 0.08185 https://api.first.org/data/v1/epss?cve=CVE-2018-20750
epss 0.08185 https://api.first.org/data/v1/epss?cve=CVE-2018-20750
epss 0.08185 https://api.first.org/data/v1/epss?cve=CVE-2018-20750
epss 0.08185 https://api.first.org/data/v1/epss?cve=CVE-2018-20750
epss 0.08185 https://api.first.org/data/v1/epss?cve=CVE-2018-20750
epss 0.08185 https://api.first.org/data/v1/epss?cve=CVE-2018-20750
epss 0.08185 https://api.first.org/data/v1/epss?cve=CVE-2018-20750
epss 0.08185 https://api.first.org/data/v1/epss?cve=CVE-2018-20750
epss 0.08185 https://api.first.org/data/v1/epss?cve=CVE-2018-20750
cvssv3 9.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 7.5 https://nvd.nist.gov/vuln/detail/CVE-2018-20750
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2018-20750
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-20750.json
https://api.first.org/data/v1/epss?cve=CVE-2018-20750
https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20750
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/LibVNC/libvncserver/commit/09e8fc02f59f16e2583b34fe1a270c238bd9ffec
https://github.com/LibVNC/libvncserver/issues/273
https://lists.debian.org/debian-lts-announce/2019/01/msg00029.html
https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
https://www.openwall.com/lists/oss-security/2018/12/10/8
http://www.securityfocus.com/bid/106825
1671405 https://bugzilla.redhat.com/show_bug.cgi?id=1671405
920941 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=920941
cpe:2.3:a:libvnc_project:libvncserver:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:libvnc_project:libvncserver:*:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
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:18.10:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
CVE-2018-20750 https://nvd.nist.gov/vuln/detail/CVE-2018-20750
USN-3877-1 https://usn.ubuntu.com/3877-1/
USN-4547-1 https://usn.ubuntu.com/4547-1/
USN-4587-1 https://usn.ubuntu.com/4587-1/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-20750.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:3.0/AV:N/AC:L/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-2018-20750
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-2018-20750
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 0.9182
EPSS Score 0.08185
Published At Aug. 6, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:36:00.834645+00:00 Ubuntu USN Importer Import https://usn.ubuntu.com/4547-1/ 37.0.0