Mozilla: Memory safety bugs fixed in Firefox 96 and Firefox ESR 91.5
Published Dec 22, 2022
8.8
HIGHCVSS 3.1
EPSS 0.89%
Description
Mozilla developers Calixte Denizet, Kershaw Chang, Christian Holler, Jason Kratzer, Gabriele Svelto, Tyson Smith, Simon Giesecke, and Steve Fink reported memory safety bugs present in Firefox 95 and Firefox ESR 91.4. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<96
- Version
-
- Version unspecifiedStatusaffectedConstraints<91.5
- Version
-
- Version unspecifiedStatusaffectedConstraints<91.5
- 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 |
|
- < 96.0
- < 91.5
- < 91.5
No data.
Red Hat Enterprise Linux 7
firefox-0:91.5.0-1.el7_9
Fixed · RHSA-2022:0124
Red Hat Enterprise Linux 7
thunderbird-0:91.5.0-1.el7_9
Fixed · RHSA-2022:0127
Red Hat Enterprise Linux 8
firefox-0:91.5.0-1.el8_5
Fixed · RHSA-2022:0130
Red Hat Enterprise Linux 8
thunderbird-0:91.5.0-1.el8_5
Fixed · RHSA-2022:0129
Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions
firefox-0:91.5.0-1.el8_1
Fixed · RHSA-2022:0125
Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions
thunderbird-0:91.5.0-1.el8_1
Fixed · RHSA-2022:0131
Red Hat Enterprise Linux 8.2 Extended Update Support
firefox-0:91.5.0-1.el8_2
Fixed · RHSA-2022:0132
Red Hat Enterprise Linux 8.2 Extended Update Support
thunderbird-0:91.5.0-1.el8_2
Fixed · RHSA-2022:0123
Red Hat Enterprise Linux 8.4 Extended Update Support
firefox-0:91.5.0-1.el8_4
Fixed · RHSA-2022:0126
Red Hat Enterprise Linux 8.4 Extended Update Support
thunderbird-0:91.5.0-1.el8_4
Fixed · RHSA-2022:0128
Red Hat Enterprise Linux 6
firefox
Out of support scope
Red Hat Enterprise Linux 6
thunderbird
Out of support scope
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | firefox-0:91.5.0-1.el7_9 | Fixed | RHSA-2022:0124 |
| Red Hat Enterprise Linux 7 | thunderbird-0:91.5.0-1.el7_9 | Fixed | RHSA-2022:0127 |
| Red Hat Enterprise Linux 8 | firefox-0:91.5.0-1.el8_5 | Fixed | RHSA-2022:0130 |
| Red Hat Enterprise Linux 8 | thunderbird-0:91.5.0-1.el8_5 | Fixed | RHSA-2022:0129 |
| Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions | firefox-0:91.5.0-1.el8_1 | Fixed | RHSA-2022:0125 |
| Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions | thunderbird-0:91.5.0-1.el8_1 | Fixed | RHSA-2022:0131 |
| Red Hat Enterprise Linux 8.2 Extended Update Support | firefox-0:91.5.0-1.el8_2 | Fixed | RHSA-2022:0132 |
| Red Hat Enterprise Linux 8.2 Extended Update Support | thunderbird-0:91.5.0-1.el8_2 | Fixed | RHSA-2022:0123 |
| Red Hat Enterprise Linux 8.4 Extended Update Support | firefox-0:91.5.0-1.el8_4 | Fixed | RHSA-2022:0126 |
| Red Hat Enterprise Linux 8.4 Extended Update Support | thunderbird-0:91.5.0-1.el8_4 | Fixed | RHSA-2022:0128 |
| Red Hat Enterprise Linux 6 | firefox | Out of support scope | n/a |
| Red Hat Enterprise Linux 6 | thunderbird | Out of support scope | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Apr 16, 2025 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 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 (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 0.89% (0.00886) | 57.83th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.87% (0.00870) | 53.90th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.17% (0.00170) | 35.93th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.20% (0.00200) | 58.85th | v3 (v2023.03.01) |
| Jun 3, 2024 | 0.15% (0.00151) | 51.30th | v3 (v2023.03.01) |
| Jan 24, 2024 | 0.14% (0.00138) | 49.35th | v3 (v2023.03.01) |
| Dec 29, 2023 | 0.12% (0.00116) | 45.27th | v3 (v2023.03.01) |
| Nov 22, 2023 | 0.07% (0.00075) | 31.20th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.06% (0.00064) | 26.17th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.02% (0.01018) | 40.69th | v2 (v2022.01.01) |
| Dec 30, 2022 | 1.02% (0.01018) | 39.67th | v2 (v2022.01.01) |
| Dec 23, 2022 | 0.95% (0.00950) | 31.62th | v2 (v2022.01.01) |
References (10)
- https://access.redhat.com/security/cve/CVE-2022-22751 Vendor Advisory
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1664149%2C1737816%2C1739366%2C1740274%2C1740797%2C1741201%2C1741869%2C1743221%2C1743515%2C1745373%2C1746011 Issue TrackingVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2039574 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2022-22751
- https://www.cve.org/CVERecord?id=CVE-2022-22751
- https://www.mozilla.org/en-US/security/advisories/mfsa2022-02/#CVE-2022-22751
- https://www.mozilla.org/en-US/security/advisories/mfsa2022-03/#CVE-2022-22751
- https://www.mozilla.org/security/advisories/mfsa2022-01/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2022-02/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2022-03/ Vendor Advisory
Change history (0)
No recorded changes yet.