Mozilla: Buffer overflow during UTF-8 to Unicode string conversion through legacy extension
Published Jun 11, 2018
8.1
HIGHCVSS 3.0
EPSS 4.99%
Description
A buffer overflow was found during UTF8 to Unicode string conversion within JavaScript with extremely large amounts of data. This vulnerability requires the use of a malicious or vulnerable legacy extension in order to occur. This vulnerability affects Thunderbird ESR < 52.8, Thunderbird < 52.8, and Firefox ESR < 52.8.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<52.8
- Version
-
- Version unspecifiedStatusaffectedConstraints<52.8
- Version
-
- Version unspecifiedStatusaffectedConstraints<52.8
- 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 ESR | n/a |
| ||||||
| Mozilla | Thunderbird | n/a |
| ||||||
| Mozilla | Thunderbird ESR | n/a |
|
Configuration 1
- 7.0
- 8.0
- 9.0
Configuration 2
- < 52.8.0
- < 52.8.0
- < 52.8.0
Configuration 3
- 14.04
- 16.04
- 17.10
- 18.04
Configuration 4
- 6.0
- 7.0
- 6.0
- 7.0
- 7.6
- 7.5
- 7.6
- 7.6
- 6.0
- 7.0
No data.
Red Hat Enterprise Linux 6
firefox-0:52.8.0-1.el6_9
Fixed · RHSA-2018:1414
Red Hat Enterprise Linux 6
thunderbird-0:52.8.0-2.el6_9
Fixed · RHSA-2018:1726
Red Hat Enterprise Linux 7
firefox-0:52.8.0-1.el7_5
Fixed · RHSA-2018:1415
Red Hat Enterprise Linux 7
thunderbird-0:52.8.0-1.el7_5
Fixed · RHSA-2018:1725
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-0:52.8.0-1.el6_9 | Fixed | RHSA-2018:1414 |
| Red Hat Enterprise Linux 6 | thunderbird-0:52.8.0-2.el6_9 | Fixed | RHSA-2018:1726 |
| Red Hat Enterprise Linux 7 | firefox-0:52.8.0-1.el7_5 | Fixed | RHSA-2018:1415 |
| Red Hat Enterprise Linux 7 | thunderbird-0:52.8.0-1.el7_5 | Fixed | RHSA-2018:1725 |
| 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.
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:M/Au:N/C:P/I:P/A:P
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 1, 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 (31 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 4.99% (0.04993) | 91.96th | v5 (v2026.06.15) |
| Sep 22, 2026 | 4.99% (0.04993) | 91.84th | v5 (v2026.06.15) |
| Sep 21, 2026 | 3.62% (0.03621) | 89.02th | v5 (v2026.06.15) |
| Sep 6, 2026 | 4.99% (0.04993) | 91.65th | v5 (v2026.06.15) |
| Sep 5, 2026 | 3.62% (0.03621) | 88.78th | v5 (v2026.06.15) |
| Aug 30, 2026 | 4.99% (0.04993) | 91.61th | v5 (v2026.06.15) |
| Aug 28, 2026 | 3.62% (0.03621) | 88.70th | v5 (v2026.06.15) |
| Aug 24, 2026 | 4.99% (0.04993) | 91.56th | v5 (v2026.06.15) |
| Aug 23, 2026 | 3.62% (0.03621) | 88.66th | v5 (v2026.06.15) |
| Jun 15, 2026 | 5.06% (0.05057) | 91.18th | v5 (v2026.06.15) |
| Sep 8, 2025 | 18.62% (0.18624) | 95.02th | v4 (v2025.03.14) |
| May 12, 2025 | 22.30% (0.22295) | 95.46th | v4 (v2025.03.14) |
| Mar 30, 2025 | 24.02% (0.24019) | 95.58th | v4 (v2025.03.14) |
| Mar 29, 2025 | 39.95% (0.39953) | 95.97th | v4 (v2025.03.14) |
| Mar 17, 2025 | 24.35% (0.24351) | 95.63th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.41% (0.00406) | 74.60th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.40% (0.00400) | 72.92th | v3 (v2023.03.01) |
| Jan 5, 2024 | 0.40% (0.00400) | 70.86th | v3 (v2023.03.01) |
| Dec 12, 2023 | 0.51% (0.00511) | 73.92th | v3 (v2023.03.01) |
| Nov 2, 2023 | 0.55% (0.00552) | 75.00th | v3 (v2023.03.01) |
| Jul 8, 2023 | 0.60% (0.00599) | 75.51th | v3 (v2023.03.01) |
| Jun 5, 2023 | 0.58% (0.00577) | 74.88th | v3 (v2023.03.01) |
| May 8, 2023 | 0.56% (0.00561) | 74.35th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.58% (0.00582) | 74.78th | 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 | 2.69% (0.02686) | 62.66th | v2 (v2022.01.01) |
| Feb 3, 2022 | 3.48% (0.03480) | 68.33th | v1 |
| Jan 6, 2022 | 3.48% (0.03480) | 68.04th | v1 |
| Sep 1, 2021 | 3.48% (0.03480) | 82.00th | v1 |
| Apr 14, 2021 | 3.48% (0.03480) | 0.00th | v1 |
References (21)
- http://www.securityfocus.com/bid/104138 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1040898 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2018:1414 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2018:1415 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2018:1725 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2018:1726 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2018-5178 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1443891 x_refsource_CONFIRMIssue TrackingPermissions RequiredVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1576278 Issue Tracking
- https://lists.debian.org/debian-lts-announce/2018/05/msg00007.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/05/msg00013.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-5178
- https://security.gentoo.org/glsa/201810-01 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://security.gentoo.org/glsa/201811-13 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://usn.ubuntu.com/3660-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2018-5178
- https://www.debian.org/security/2018/dsa-4199 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.debian.org/security/2018/dsa-4209 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.mozilla.org/en-US/security/advisories/mfsa2018-12/#CVE-2018-5178
- https://www.mozilla.org/security/advisories/mfsa2018-12/ x_refsource_CONFIRMVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2018-13/ x_refsource_CONFIRMVendor Advisory
Change history (0)
No recorded changes yet.