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Vulnerability details: VCID-6gnz-hb85-zyaa
Vulnerability ID VCID-6gnz-hb85-zyaa
Aliases CVE-2019-17016
Summary When pasting a <style> tag from the clipboard into a rich text editor, the CSS sanitizer incorrectly rewrites a @namespace rule. This could allow for injection into certain types of websites resulting in data exfiltration.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
System Score Found at
cvssv3 6.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-17016.json
epss 0.01834 https://api.first.org/data/v1/epss?cve=CVE-2019-17016
epss 0.01834 https://api.first.org/data/v1/epss?cve=CVE-2019-17016
epss 0.01834 https://api.first.org/data/v1/epss?cve=CVE-2019-17016
epss 0.01834 https://api.first.org/data/v1/epss?cve=CVE-2019-17016
epss 0.01834 https://api.first.org/data/v1/epss?cve=CVE-2019-17016
epss 0.01834 https://api.first.org/data/v1/epss?cve=CVE-2019-17016
epss 0.01834 https://api.first.org/data/v1/epss?cve=CVE-2019-17016
epss 0.01834 https://api.first.org/data/v1/epss?cve=CVE-2019-17016
epss 0.01834 https://api.first.org/data/v1/epss?cve=CVE-2019-17016
epss 0.01834 https://api.first.org/data/v1/epss?cve=CVE-2019-17016
epss 0.01834 https://api.first.org/data/v1/epss?cve=CVE-2019-17016
epss 0.01834 https://api.first.org/data/v1/epss?cve=CVE-2019-17016
epss 0.01834 https://api.first.org/data/v1/epss?cve=CVE-2019-17016
epss 0.01834 https://api.first.org/data/v1/epss?cve=CVE-2019-17016
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2019-17016
cvssv3.1 6.1 https://nvd.nist.gov/vuln/detail/CVE-2019-17016
archlinux Critical https://security.archlinux.org/AVG-1084
archlinux Critical https://security.archlinux.org/AVG-1086
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-01
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-02
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2020-04
Reference id Reference type URL
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00029.html
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00043.html
http://packetstormsecurity.com/files/155912/Slackware-Security-Advisory-mozilla-thunderbird-Updates.html
https://access.redhat.com/errata/RHSA-2020:0085
https://access.redhat.com/errata/RHSA-2020:0086
https://access.redhat.com/errata/RHSA-2020:0111
https://access.redhat.com/errata/RHSA-2020:0120
https://access.redhat.com/errata/RHSA-2020:0123
https://access.redhat.com/errata/RHSA-2020:0127
https://access.redhat.com/errata/RHSA-2020:0292
https://access.redhat.com/errata/RHSA-2020:0295
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-17016.json
https://api.first.org/data/v1/epss?cve=CVE-2019-17016
https://bugzilla.mozilla.org/show_bug.cgi?id=1599181
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-17016
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-17017
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-17022
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-17024
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-17026
https://lists.debian.org/debian-lts-announce/2020/01/msg00005.html
https://lists.debian.org/debian-lts-announce/2020/01/msg00016.html
https://seclists.org/bugtraq/2020/Jan/12
https://seclists.org/bugtraq/2020/Jan/18
https://seclists.org/bugtraq/2020/Jan/26
https://www.debian.org/security/2020/dsa-4600
https://www.debian.org/security/2020/dsa-4603
https://www.mozilla.org/security/advisories/mfsa2020-01/
https://www.mozilla.org/security/advisories/mfsa2020-02/
1788723 https://bugzilla.redhat.com/show_bug.cgi?id=1788723
ASA-202001-1 https://security.archlinux.org/ASA-202001-1
ASA-202001-4 https://security.archlinux.org/ASA-202001-4
AVG-1084 https://security.archlinux.org/AVG-1084
AVG-1086 https://security.archlinux.org/AVG-1086
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: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:19.04:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*
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:debian:debian_linux:10.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
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:7.7:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_server_aus:7.7:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server_tus:7.7:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_server_tus:7.7:*:*:*:*:*:*:*
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-2019-17016 https://nvd.nist.gov/vuln/detail/CVE-2019-17016
mfsa2020-01 https://www.mozilla.org/en-US/security/advisories/mfsa2020-01
mfsa2020-02 https://www.mozilla.org/en-US/security/advisories/mfsa2020-02
mfsa2020-04 https://www.mozilla.org/en-US/security/advisories/mfsa2020-04
USN-4234-1 https://usn.ubuntu.com/4234-1/
USN-4241-1 https://usn.ubuntu.com/4241-1/
USN-4335-1 https://usn.ubuntu.com/4335-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-17016.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: AV:N/AC:M/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2019-17016
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:R/S:C/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2019-17016
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 0.82166
EPSS Score 0.01834
Published At Aug. 10, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:39.261070+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2020/mfsa2020-04.yml 37.0.0