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Vulnerability details: VCID-pq58-y3yx-47ev
Vulnerability ID VCID-pq58-y3yx-47ev
Aliases CVE-2018-6307
Summary LibVNC before commit ca2a5ac02fbbadd0a21fabba779c1ea69173d10b contains heap use-after-free vulnerability in server code of file transfer extension that can result remote code execution.
Status Published
Exploitability 0.5
Weighted Severity 7.3
Risk 3.6
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-416 Use After Free
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-6307.json
epss 0.11383 https://api.first.org/data/v1/epss?cve=CVE-2018-6307
epss 0.11383 https://api.first.org/data/v1/epss?cve=CVE-2018-6307
epss 0.11383 https://api.first.org/data/v1/epss?cve=CVE-2018-6307
epss 0.11383 https://api.first.org/data/v1/epss?cve=CVE-2018-6307
epss 0.11383 https://api.first.org/data/v1/epss?cve=CVE-2018-6307
epss 0.11383 https://api.first.org/data/v1/epss?cve=CVE-2018-6307
epss 0.11383 https://api.first.org/data/v1/epss?cve=CVE-2018-6307
epss 0.11383 https://api.first.org/data/v1/epss?cve=CVE-2018-6307
epss 0.11383 https://api.first.org/data/v1/epss?cve=CVE-2018-6307
epss 0.11383 https://api.first.org/data/v1/epss?cve=CVE-2018-6307
epss 0.11383 https://api.first.org/data/v1/epss?cve=CVE-2018-6307
epss 0.11383 https://api.first.org/data/v1/epss?cve=CVE-2018-6307
epss 0.11383 https://api.first.org/data/v1/epss?cve=CVE-2018-6307
epss 0.11383 https://api.first.org/data/v1/epss?cve=CVE-2018-6307
epss 0.11383 https://api.first.org/data/v1/epss?cve=CVE-2018-6307
epss 0.11383 https://api.first.org/data/v1/epss?cve=CVE-2018-6307
epss 0.11383 https://api.first.org/data/v1/epss?cve=CVE-2018-6307
epss 0.11383 https://api.first.org/data/v1/epss?cve=CVE-2018-6307
epss 0.11383 https://api.first.org/data/v1/epss?cve=CVE-2018-6307
epss 0.11383 https://api.first.org/data/v1/epss?cve=CVE-2018-6307
epss 0.11383 https://api.first.org/data/v1/epss?cve=CVE-2018-6307
epss 0.11383 https://api.first.org/data/v1/epss?cve=CVE-2018-6307
cvssv3 9.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 6.8 https://nvd.nist.gov/vuln/detail/CVE-2018-6307
cvssv3 8.1 https://nvd.nist.gov/vuln/detail/CVE-2018-6307
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-6307.json
https://api.first.org/data/v1/epss?cve=CVE-2018-6307
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15126
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15127
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20019
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20020
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20021
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20022
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20023
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20024
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-21247
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6307
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/LibVNC/libvncserver/issues/241
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-026-libvnc-heap-use-after-free/
https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html
https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
https://www.debian.org/security/2019/dsa-4383
1661136 https://bugzilla.redhat.com/show_bug.cgi?id=1661136
916941 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=916941
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:*:*:*: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-2018-6307 https://nvd.nist.gov/vuln/detail/CVE-2018-6307
USN-3877-1 https://usn.ubuntu.com/3877-1/
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-2018-6307.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:M/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2018-6307
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:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2018-6307
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 0.93272
EPSS Score 0.11383
Published At Aug. 8, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:38:39.582439+00:00 Ubuntu USN Importer Import https://usn.ubuntu.com/3877-1/ 37.0.0