Mozilla: Use-after-free in WebSockets during disconnection (MFSA 2017-19)
Published Jun 11, 2018
9.8
CRITICALCVSS 3.0
EPSS 3.00%
Description
A use-after-free vulnerability can occur in WebSockets when the object holding the connection is freed before the disconnection operation is finished. This results in an exploitable crash. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<55
- Version
-
- Version unspecifiedStatusaffectedConstraints<52.3
- Version
-
- Version unspecifiedStatusaffectedConstraints<52.3
- 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 |
| ||||||
| Mozilla | Thunderbird | n/a |
|
Configuration 1
- 8.0
- 9.0
Configuration 2
- 6.0
- 7.0
- 6.0
- 7.0
- 6.0
- 7.0
- 7.3
- 7.4
- 7.3
- 7.4
- 7.5
- 6.0
- 7.0
Configuration 5
- < 52.3.0
No data.
Red Hat Enterprise Linux 6
firefox-0:52.3.0-3.el6_9
Fixed · RHSA-2017:2456
Red Hat Enterprise Linux 6
thunderbird-0:52.3.0-1.el6_9
Fixed · RHSA-2017:2534
Red Hat Enterprise Linux 7
firefox-0:52.3.0-2.el7_4
Fixed · RHSA-2017:2456
Red Hat Enterprise Linux 7
thunderbird-0:52.3.0-1.el7_4
Fixed · RHSA-2017:2534
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | firefox-0:52.3.0-3.el6_9 | Fixed | RHSA-2017:2456 |
| Red Hat Enterprise Linux 6 | thunderbird-0:52.3.0-1.el6_9 | Fixed | RHSA-2017:2534 |
| Red Hat Enterprise Linux 7 | firefox-0:52.3.0-2.el7_4 | Fixed | RHSA-2017:2456 |
| Red Hat Enterprise Linux 7 | thunderbird-0:52.3.0-1.el7_4 | Fixed | RHSA-2017:2534 |
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:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:L/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 3, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (16 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 3.00% (0.02997) | 86.90th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.04% (0.03036) | 85.74th | v5 (v2026.06.15) |
| Sep 8, 2025 | 4.50% (0.04503) | 88.70th | v4 (v2025.03.14) |
| Mar 30, 2025 | 5.72% (0.05724) | 89.50th | v4 (v2025.03.14) |
| Mar 29, 2025 | 10.52% (0.10516) | 88.68th | v4 (v2025.03.14) |
| Mar 17, 2025 | 5.83% (0.05827) | 89.85th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.77% (0.00767) | 81.91th | v3 (v2023.03.01) |
| May 7, 2024 | 0.76% (0.00756) | 80.97th | v3 (v2023.03.01) |
| Dec 12, 2023 | 0.76% (0.00756) | 78.97th | v3 (v2023.03.01) |
| Nov 2, 2023 | 0.90% (0.00897) | 80.92th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.91% (0.00913) | 80.85th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.79% (0.00791) | 78.87th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.54% (0.01537) | 74.52th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.54% (0.01537) | 51.33th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.63% (0.02627) | 55.32th | v5 (v2026.06.15) |
| Apr 14, 2021 | 2.63% (0.02627) | 0.00th | v1 |
References (16)
- http://www.securityfocus.com/bid/100196 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1039124 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2017:2456 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2534 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2017-7800 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1374047 x_refsource_CONFIRMExploitIssue TrackingPatchVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1479218 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2017-7800
- https://security.gentoo.org/glsa/201803-14 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2017-7800
- https://www.debian.org/security/2017/dsa-3928 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.debian.org/security/2017/dsa-3968 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.mozilla.org/en-US/security/advisories/mfsa2017-19/#CVE-2017-7800
- https://www.mozilla.org/security/advisories/mfsa2017-18/ x_refsource_CONFIRMVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-19/ x_refsource_CONFIRMVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-20/ x_refsource_CONFIRMVendor Advisory
Change history (0)
No recorded changes yet.