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Vulnerability details: VCID-aqm7-bqtg-nfhu
Vulnerability ID VCID-aqm7-bqtg-nfhu
Aliases CVE-2018-18500
Summary A use-after-free vulnerability can occur while parsing an HTML5 stream in concert with custom HTML elements. This results in the stream parser object being freed while still in use, leading to a potentially exploitable crash.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-416 Use After Free
System Score Found at
cvssv3 9.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-18500.json
epss 0.28802 https://api.first.org/data/v1/epss?cve=CVE-2018-18500
epss 0.28802 https://api.first.org/data/v1/epss?cve=CVE-2018-18500
epss 0.28802 https://api.first.org/data/v1/epss?cve=CVE-2018-18500
epss 0.28802 https://api.first.org/data/v1/epss?cve=CVE-2018-18500
epss 0.28802 https://api.first.org/data/v1/epss?cve=CVE-2018-18500
epss 0.28802 https://api.first.org/data/v1/epss?cve=CVE-2018-18500
epss 0.28802 https://api.first.org/data/v1/epss?cve=CVE-2018-18500
epss 0.28802 https://api.first.org/data/v1/epss?cve=CVE-2018-18500
epss 0.28802 https://api.first.org/data/v1/epss?cve=CVE-2018-18500
epss 0.28802 https://api.first.org/data/v1/epss?cve=CVE-2018-18500
epss 0.28802 https://api.first.org/data/v1/epss?cve=CVE-2018-18500
epss 0.28802 https://api.first.org/data/v1/epss?cve=CVE-2018-18500
cvssv3 8.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 7.5 https://nvd.nist.gov/vuln/detail/CVE-2018-18500
cvssv3 9.8 https://nvd.nist.gov/vuln/detail/CVE-2018-18500
archlinux Critical https://security.archlinux.org/AVG-862
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2019-01
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2019-02
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2019-03
Reference id Reference type URL
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00021.html
https://access.redhat.com/errata/RHSA-2019:0218
https://access.redhat.com/errata/RHSA-2019:0219
https://access.redhat.com/errata/RHSA-2019:0269
https://access.redhat.com/errata/RHSA-2019:0270
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-18500.json
https://api.first.org/data/v1/epss?cve=CVE-2018-18500
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-18356
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-18500
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-18501
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-18505
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-18509
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-18512
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-18513
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5785
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://lists.debian.org/debian-lts-announce/2019/01/msg00025.html
https://lists.debian.org/debian-lts-announce/2019/02/msg00024.html
https://security.gentoo.org/glsa/201903-04
https://security.gentoo.org/glsa/201904-07
https://www.debian.org/security/2019/dsa-4376
https://www.debian.org/security/2019/dsa-4392
https://www.mozilla.org/security/advisories/mfsa2019-01/
https://www.mozilla.org/security/advisories/mfsa2019-02/
https://www.mozilla.org/security/advisories/mfsa2019-03/
http://www.securityfocus.com/bid/106781
1670631 https://bugzilla.redhat.com/show_bug.cgi?id=1670631
ASA-201902-2 https://security.archlinux.org/ASA-201902-2
AVG-862 https://security.archlinux.org/AVG-862
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*
CVE-2018-18500 https://nvd.nist.gov/vuln/detail/CVE-2018-18500
mfsa2019-01 https://www.mozilla.org/en-US/security/advisories/mfsa2019-01
mfsa2019-02 https://www.mozilla.org/en-US/security/advisories/mfsa2019-02
mfsa2019-03 https://www.mozilla.org/en-US/security/advisories/mfsa2019-03
USN-3874-1 https://usn.ubuntu.com/3874-1/
USN-3897-1 https://usn.ubuntu.com/3897-1/
No exploits are available.
Vector: CVSS:3.0/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-2018-18500.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:R/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-2018-18500
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:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2018-18500
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 0.96359
EPSS Score 0.28802
Published At Aug. 13, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:59.097114+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2019/mfsa2019-01.yml 37.0.0