CRITICAL
Mozilla: Use-after-free parsing HTML5 stream
Published Feb 5, 2019
9.8
CRITICALCVSS 3.0
EPSS 12.66%
Description
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. This vulnerability affects Thunderbird < 60.5, Firefox ESR < 60.5, and Firefox < 65.
Affected products
No data.
Configuration 1
OR
- < 65.0
- < 60.5
- < 60.5
Configuration 2
OR
- 14.04
- 16.04
- 18.04
- 18.10
Configuration 3
OR
- 8.0
- 9.0
Configuration 4
OR
- 6.0
- 7.0
- 6.0
- 7.0
- 7.6
- 7.6
- 7.6
- 6.0
- 7.0
No data.
Red Hat Enterprise Linux 6
firefox-0:60.5.0-2.el6
Fixed · RHSA-2019:0218
Red Hat Enterprise Linux 6
thunderbird-0:60.5.0-1.el6_10
Fixed · RHSA-2019:0269
Red Hat Enterprise Linux 7
firefox-0:60.5.0-2.el7
Fixed · RHSA-2019:0219
Red Hat Enterprise Linux 7
thunderbird-0:60.5.0-1.el7_6
Fixed · RHSA-2019:0270
Red Hat Enterprise Linux 8
firefox
Not affected
Red Hat Enterprise Linux 8
thunderbird
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | firefox-0:60.5.0-2.el6 | Fixed | RHSA-2019:0218 |
| Red Hat Enterprise Linux 6 | thunderbird-0:60.5.0-1.el6_10 | Fixed | RHSA-2019:0269 |
| Red Hat Enterprise Linux 7 | firefox-0:60.5.0-2.el7 | Fixed | RHSA-2019:0219 |
| Red Hat Enterprise Linux 7 | thunderbird-0:60.5.0-1.el7_6 | Fixed | RHSA-2019:0270 |
| Red Hat Enterprise Linux 8 | firefox | Not affected | n/a |
| Red Hat Enterprise Linux 8 | thunderbird | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
9.8 CRITICAL NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
7.5 HIGH NVD
AV:N/AC:L/Au:N/C:P/I:P/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
12.66% 0.12658
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
EPSS probability 0.12658
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 (43 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 12.66% (0.12658) | 96.14th | v5 (v2026.06.15) |
| Sep 22, 2026 | 12.66% (0.12658) | 96.07th | v5 (v2026.06.15) |
| Sep 21, 2026 | 11.62% (0.11616) | 95.91th | v5 (v2026.06.15) |
| Sep 6, 2026 | 12.66% (0.12658) | 95.98th | v5 (v2026.06.15) |
| Sep 5, 2026 | 11.62% (0.11616) | 95.82th | v5 (v2026.06.15) |
| Aug 30, 2026 | 12.66% (0.12658) | 95.96th | v5 (v2026.06.15) |
| Aug 28, 2026 | 11.62% (0.11616) | 95.79th | v5 (v2026.06.15) |
| Aug 24, 2026 | 12.66% (0.12658) | 95.94th | v5 (v2026.06.15) |
| Aug 23, 2026 | 11.62% (0.11616) | 95.78th | v5 (v2026.06.15) |
| Jun 15, 2026 | 12.66% (0.12658) | 95.73th | v5 (v2026.06.15) |
| May 29, 2026 | 35.41% (0.35406) | 97.13th | v4 (v2025.03.14) |
| May 26, 2026 | 33.41% (0.33410) | 96.99th | v4 (v2025.03.14) |
| Dec 28, 2025 | 28.54% (0.28539) | 96.36th | v4 (v2025.03.14) |
| Dec 27, 2025 | 27.14% (0.27142) | 96.24th | v4 (v2025.03.14) |
| Nov 21, 2025 | 28.54% (0.28539) | 96.32th | v4 (v2025.03.14) |
| Nov 18, 2025 | 37.43% (0.37434) | 96.99th | v4 (v2025.03.14) |
| Nov 10, 2025 | 28.90% (0.28905) | 96.34th | v4 (v2025.03.14) |
| Oct 28, 2025 | 30.24% (0.30241) | 96.45th | v4 (v2025.03.14) |
| Oct 27, 2025 | 28.80% (0.28802) | 96.33th | v4 (v2025.03.14) |
| Oct 1, 2025 | 30.24% (0.30241) | 96.54th | v4 (v2025.03.14) |
| Jul 30, 2025 | 28.80% (0.28802) | 96.36th | v4 (v2025.03.14) |
| May 25, 2025 | 32.16% (0.32159) | 96.58th | v4 (v2025.03.14) |
| Mar 30, 2025 | 41.87% (0.41873) | 97.15th | v4 (v2025.03.14) |
| Mar 29, 2025 | 72.34% (0.72341) | 98.36th | v4 (v2025.03.14) |
| Mar 28, 2025 | 41.87% (0.41873) | 97.15th | v4 (v2025.03.14) |
| Mar 27, 2025 | 72.34% (0.72341) | 98.62th | v4 (v2025.03.14) |
| Mar 20, 2025 | 58.09% (0.58091) | 98.02th | v4 (v2025.03.14) |
| Mar 19, 2025 | 72.34% (0.72341) | 98.65th | v4 (v2025.03.14) |
| Mar 17, 2025 | 58.09% (0.58091) | 97.96th | v4 (v2025.03.14) |
| Dec 17, 2024 | 9.92% (0.09923) | 94.86th | v3 (v2023.03.01) |
| Nov 20, 2024 | 17.27% (0.17272) | 96.26th | v3 (v2023.03.01) |
| Sep 24, 2024 | 22.56% (0.22560) | 96.60th | v3 (v2023.03.01) |
| Aug 31, 2024 | 28.82% (0.28817) | 96.94th | v3 (v2023.03.01) |
| Aug 7, 2024 | 35.89% (0.35891) | 97.21th | v3 (v2023.03.01) |
| Jun 28, 2024 | 37.54% (0.37543) | 97.23th | v3 (v2023.03.01) |
| Jan 30, 2024 | 42.02% (0.42019) | 96.99th | v3 (v2023.03.01) |
| Mar 7, 2023 | 36.59% (0.36590) | 96.50th | v3 (v2023.03.01) |
| Mar 6, 2023 | 24.56% (0.24563) | 96.82th | v2 (v2022.01.01) |
| Feb 4, 2022 | 24.56% (0.24563) | 95.26th | v2 (v2022.01.01) |
| Feb 3, 2022 | 14.63% (0.14629) | 89.77th | v1 |
| Jan 6, 2022 | 14.63% (0.14629) | 89.65th | v1 |
| Sep 1, 2021 | 14.63% (0.14629) | 97.04th | v1 |
| Apr 14, 2021 | 14.63% (0.14629) | 0.00th | v1 |
Weaknesses (1)
References (22)
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00021.html vendor-advisoryx_refsource_SUSE
- http://www.securityfocus.com/bid/106781 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2019:0218 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0219 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0269 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0270 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2018-18500 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1670631 Issue Tracking
- https://lists.debian.org/debian-lts-announce/2019/01/msg00025.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/02/msg00024.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-18500
- https://security.gentoo.org/glsa/201903-04 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://security.gentoo.org/glsa/201904-07 vendor-advisoryx_refsource_GENTOO
- https://usn.ubuntu.com/3874-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://usn.ubuntu.com/3897-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2018-18500
- https://www.debian.org/security/2019/dsa-4376 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.debian.org/security/2019/dsa-4392 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.mozilla.org/en-US/security/advisories/mfsa2019-02/#CVE-2018-18500
- https://www.mozilla.org/security/advisories/mfsa2019-01/ x_refsource_CONFIRMVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-02/ x_refsource_CONFIRMVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-03/ x_refsource_CONFIRMVendor Advisory
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mozilla
Published Feb 5, 2019
Updated Aug 5, 2024
Reserved Oct 19, 2018
Link CVE-2018-18500
CISA Vulnrichment
Updated n/a