Mozilla: Integer overflow and memory corruption in WebSocketChannel (MFSA 2016-75, MFSA 2016-86)
Published Aug 5, 2016
8.8
HIGHCVSS 3.0
EPSS 4.18%
Description
Integer overflow in the WebSocketChannel class in the WebSockets subsystem in Mozilla Firefox before 48.0 and Firefox ESR < 45.4 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via crafted packets that trigger incorrect buffer-resize operations during buffering.
Affected products
No data.
No data.
Red Hat Enterprise Linux 5
firefox-0:45.4.0-1.el5_11
Fixed · RHSA-2016:1912
Red Hat Enterprise Linux 6
firefox-0:45.4.0-1.el6_8
Fixed · RHSA-2016:1912
Red Hat Enterprise Linux 7
firefox-0:45.4.0-1.el7_2
Fixed · RHSA-2016:1912
Red Hat Enterprise Linux 5
thunderbird
Not affected
Red Hat Enterprise Linux 6
thunderbird
Not affected
Red Hat Enterprise Linux 7
thunderbird
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | firefox-0:45.4.0-1.el5_11 | Fixed | RHSA-2016:1912 |
| Red Hat Enterprise Linux 6 | firefox-0:45.4.0-1.el6_8 | Fixed | RHSA-2016:1912 |
| Red Hat Enterprise Linux 7 | firefox-0:45.4.0-1.el7_2 | Fixed | RHSA-2016:1912 |
| Red Hat Enterprise Linux 5 | thunderbird | Not affected | n/a |
| Red Hat Enterprise Linux 6 | thunderbird | Not affected | n/a |
| Red Hat Enterprise Linux 7 | 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:L/PR:N/UI:R/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 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (20 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 4.18% (0.04178) | 90.60th | v5 (v2026.06.15) |
| Sep 22, 2026 | 4.18% (0.04178) | 90.46th | v5 (v2026.06.15) |
| Sep 21, 2026 | 5.44% (0.05440) | 92.42th | v5 (v2026.06.15) |
| Sep 6, 2026 | 4.18% (0.04178) | 90.25th | v5 (v2026.06.15) |
| Sep 5, 2026 | 5.44% (0.05440) | 92.26th | v5 (v2026.06.15) |
| Aug 30, 2026 | 4.18% (0.04178) | 90.19th | v5 (v2026.06.15) |
| Aug 28, 2026 | 5.44% (0.05440) | 92.21th | v5 (v2026.06.15) |
| Aug 24, 2026 | 4.18% (0.04178) | 90.13th | v5 (v2026.06.15) |
| Aug 23, 2026 | 5.44% (0.05440) | 92.18th | v5 (v2026.06.15) |
| Jun 15, 2026 | 4.10% (0.04099) | 89.40th | v5 (v2026.06.15) |
| Mar 30, 2025 | 1.14% (0.01136) | 76.43th | v4 (v2025.03.14) |
| Mar 29, 2025 | 3.41% (0.03409) | 78.87th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.14% (0.01136) | 76.90th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.90% (0.01896) | 88.99th | v3 (v2023.03.01) |
| Nov 5, 2023 | 1.90% (0.01896) | 87.22th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.65% (0.01652) | 85.60th | v3 (v2023.03.01) |
| Mar 6, 2023 | 5.86% (0.05857) | 90.50th | v2 (v2022.01.01) |
| Jun 15, 2022 | 5.86% (0.05857) | 89.77th | v2 (v2022.01.01) |
| Apr 1, 2022 | 5.20% (0.05203) | 88.64th | v2 (v2022.01.01) |
| Feb 4, 2022 | 5.20% (0.05203) | 75.22th | v2 (v2022.01.01) |
References (17)
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00004.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00029.html vendor-advisoryx_refsource_SUSE
- http://rhn.redhat.com/errata/RHSA-2016-1912.html vendor-advisoryx_refsource_REDHAT
- http://www.debian.org/security/2016/dsa-3674 vendor-advisoryx_refsource_DEBIAN
- http://www.mozilla.org/security/announce/2016/mfsa2016-75.html x_refsource_CONFIRMVendor Advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html x_refsource_CONFIRM
- http://www.securityfocus.com/bid/92260 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1036508 vdb-entryx_refsource_SECTRACK
- http://www.ubuntu.com/usn/USN-3044-1 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/security/cve/CVE-2016-5261 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1287266 x_refsource_CONFIRMIssue TrackingPermissions Required
- https://bugzilla.redhat.com/show_bug.cgi?id=1361986 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2016-5261
- https://security.gentoo.org/glsa/201701-15 vendor-advisoryx_refsource_GENTOO
- https://www.cve.org/CVERecord?id=CVE-2016-5261
- https://www.mozilla.org/security/advisories/mfsa2016-75/
- https://www.mozilla.org/security/advisories/mfsa2016-86/ x_refsource_CONFIRM
Change history (0)
No recorded changes yet.