Mozilla: Bypass of @namespace CSS sanitization during pasting
Published Jan 8, 2020
6.1
MEDIUMCVSS 3.1
EPSS 1.99%
Description
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. This vulnerability affects Firefox ESR < 68.4 and Firefox < 72.
Affected products
-
- Version before 72StatusaffectedConstraints-
- Version
-
- Version before 68.4StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Mozilla | Firefox | n/a |
| ||||||
| Mozilla | Firefox ESR | n/a |
|
Configuration 1
- < 72.0
- < 68.4
Configuration 2
- 8.0
- 9.0
- 10.0
Configuration 3
- 16.04
- 18.04
- 19.04
- 19.10
Configuration 4
- 6.0
- 7.0
- 6.0
- 7.0
- 7.7
- 7.7
- 6.0
- 7.0
No data.
Red Hat Enterprise Linux 6
firefox-0:68.4.1-1.el6_10
Fixed · RHSA-2020:0086
Red Hat Enterprise Linux 6
thunderbird-0:68.4.1-2.el6_10
Fixed · RHSA-2020:0123
Red Hat Enterprise Linux 7
firefox-0:68.4.1-1.el7_7
Fixed · RHSA-2020:0085
Red Hat Enterprise Linux 7
thunderbird-0:68.4.1-2.el7_7
Fixed · RHSA-2020:0120
Red Hat Enterprise Linux 8
firefox-0:68.4.1-1.el8_1
Fixed · RHSA-2020:0111
Red Hat Enterprise Linux 8
thunderbird-0:68.4.1-2.el8_1
Fixed · RHSA-2020:0127
Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions
firefox-0:68.4.1-1.el8_0
Fixed · RHSA-2020:0295
Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions
thunderbird-0:68.4.1-2.el8_0
Fixed · RHSA-2020:0292
Red Hat Enterprise Linux 5
firefox
Out of support scope
Red Hat Enterprise Linux 5
thunderbird
Out of support scope
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | firefox-0:68.4.1-1.el6_10 | Fixed | RHSA-2020:0086 |
| Red Hat Enterprise Linux 6 | thunderbird-0:68.4.1-2.el6_10 | Fixed | RHSA-2020:0123 |
| Red Hat Enterprise Linux 7 | firefox-0:68.4.1-1.el7_7 | Fixed | RHSA-2020:0085 |
| Red Hat Enterprise Linux 7 | thunderbird-0:68.4.1-2.el7_7 | Fixed | RHSA-2020:0120 |
| Red Hat Enterprise Linux 8 | firefox-0:68.4.1-1.el8_1 | Fixed | RHSA-2020:0111 |
| Red Hat Enterprise Linux 8 | thunderbird-0:68.4.1-2.el8_1 | Fixed | RHSA-2020:0127 |
| Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions | firefox-0:68.4.1-1.el8_0 | Fixed | RHSA-2020:0295 |
| Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions | thunderbird-0:68.4.1-2.el8_0 | Fixed | RHSA-2020:0292 |
| Red Hat Enterprise Linux 5 | firefox | Out of support scope | n/a |
| Red Hat Enterprise Linux 5 | thunderbird | Out of support scope | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (24 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 1.99% (0.01988) | 79.91th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.99% (0.01995) | 78.04th | v5 (v2026.06.15) |
| May 27, 2026 | 1.80% (0.01798) | 83.04th | v4 (v2025.03.14) |
| Dec 28, 2025 | 3.46% (0.03465) | 87.17th | v4 (v2025.03.14) |
| Dec 27, 2025 | 1.83% (0.01834) | 82.52th | v4 (v2025.03.14) |
| Nov 21, 2025 | 3.46% (0.03465) | 87.06th | v4 (v2025.03.14) |
| Nov 18, 2025 | 1.91% (0.01909) | 81.82th | v4 (v2025.03.14) |
| Oct 28, 2025 | 3.46% (0.03465) | 87.02th | v4 (v2025.03.14) |
| Oct 27, 2025 | 1.83% (0.01834) | 82.33th | v4 (v2025.03.14) |
| Oct 1, 2025 | 3.46% (0.03465) | 87.12th | v4 (v2025.03.14) |
| Mar 17, 2025 | 2.17% (0.02173) | 83.17th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.31% (0.00309) | 70.85th | v3 (v2023.03.01) |
| May 3, 2024 | 0.31% (0.00309) | 69.84th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.45% (0.00445) | 74.21th | v3 (v2023.03.01) |
| Dec 15, 2023 | 0.45% (0.00445) | 72.14th | v3 (v2023.03.01) |
| Nov 12, 2023 | 0.39% (0.00390) | 70.29th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.36% (0.00363) | 67.98th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.69% (0.02686) | 82.85th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.69% (0.02686) | 81.17th | v2 (v2022.01.01) |
| Feb 4, 2022 | 17.11% (0.17112) | 93.05th | v2 (v2022.01.01) |
| Feb 3, 2022 | 20.87% (0.20870) | 94.22th | v1 |
| Jan 6, 2022 | 20.87% (0.20870) | 94.15th | v1 |
| Sep 1, 2021 | 5.55% (0.05552) | 88.56th | v1 |
| Apr 14, 2021 | 5.55% (0.05552) | 0.00th | v1 |
References (30)
- http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00029.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00043.html vendor-advisoryx_refsource_SUSE
- http://packetstormsecurity.com/files/155912/Slackware-Security-Advisory-mozilla-thunderbird-Updates.html x_refsource_MISC
- https://access.redhat.com/errata/RHSA-2020:0085 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2020:0086 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2020:0111 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2020:0120 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2020:0123 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2020:0127 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2020:0292 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2020:0295 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2019-17016 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1599181 x_refsource_MISCPermissions Required
- https://bugzilla.redhat.com/show_bug.cgi?id=1788723 Issue Tracking
- https://lists.debian.org/debian-lts-announce/2020/01/msg00005.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/01/msg00016.html mailing-listx_refsource_MLIST
- https://nvd.nist.gov/vuln/detail/CVE-2019-17016
- https://seclists.org/bugtraq/2020/Jan/12 mailing-listx_refsource_BUGTRAQMailing ListThird Party Advisory
- https://seclists.org/bugtraq/2020/Jan/18 mailing-listx_refsource_BUGTRAQMailing ListThird Party Advisory
- https://seclists.org/bugtraq/2020/Jan/26 mailing-listx_refsource_BUGTRAQ
- https://security.gentoo.org/glsa/202003-02 vendor-advisoryx_refsource_GENTOO
- https://usn.ubuntu.com/4234-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://usn.ubuntu.com/4241-1/ vendor-advisoryx_refsource_UBUNTU
- https://usn.ubuntu.com/4335-1/ vendor-advisoryx_refsource_UBUNTU
- https://www.cve.org/CVERecord?id=CVE-2019-17016
- https://www.debian.org/security/2020/dsa-4600 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.debian.org/security/2020/dsa-4603 vendor-advisoryx_refsource_DEBIAN
- https://www.mozilla.org/en-US/security/advisories/mfsa2020-02/#CVE-2019-17016
- https://www.mozilla.org/security/advisories/mfsa2020-01/ x_refsource_CONFIRMVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-02/ x_refsource_CONFIRMVendor Advisory
Change history (0)
No recorded changes yet.