Linux · 
Red Hat · Security advisory · November 3, 2021
Red Hat · Security advisory · November 3, 2021RHSA-2021:4123: firefox security update
RHSA-2021:4123, released November 3, 2021, fixes 8 CVEs in firefox (version 0:91.3.0-1.el8_4). None of them is reported as exploited. Patch Radar priority: High.
High
CVEs closed
8
None rated Critical
Exploited
0
None reported
Highest CVSS
10.0
Base score, 0 to 10
Highest EPSS
0.0412
90th percentile
Priority of the 8 CVEs
Patch now 0
Urgent 0
High 6
Routine 2
Fixed package versions
| Product | Release | Fixed in |
|---|---|---|
| firefox | RHEL 8 | 0:91.3.0-1.el8_4 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| High | CVE-2021-38503 | Mozilla Firefox ESR and 3 others: The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass… | 10.0 | 0.0412 | None reported |
| High | CVE-2021-38504 | Mozilla Firefox ESR and 3 others: When interacting with an HTML input element's file picker dialog with webkitdirectory set, a use-after-free… | 9.8 | 0.0177 | None reported |
| High | CVE-2021-38506 | Mozilla Firefox ESR and 3 others: Through a series of navigations, Firefox could have entered fullscreen mode without notification or warning… | 7.5 | 0.0151 | None reported |
| High | CVE-2021-43534 | Mozilla Firefox ESR and 3 others: Mozilla developers and community members reported memory safety bugs present in Firefox 93 and Firefox… | 8.8 | 0.0125 | None reported |
| High | CVE-2021-43535 | Mozilla Firefox ESR and 3 others: A use-after-free could have occured when an HTTP2 session object was released on a different thread,… | 8.8 | 0.0115 | None reported |
| High | CVE-2021-38507 | Mozilla Firefox ESR and 3 others: The Opportunistic Encryption feature of HTTP2 (RFC 8164) allows a connection to be transparently upgraded… | 7.5 | 0.0083 | None reported |
| Routine | CVE-2021-38509 | Mozilla Firefox ESR and 3 others: Due to an unusual sequence of attacker-controlled events, a Javascript alert() dialog with arbitrary… | 6.1 | 0.0176 | None reported |
| Routine | CVE-2021-38508 | Mozilla Firefox ESR and 3 others: By displaying a form validity message in the correct location at the same time as a permission prompt… | 6.1 | 0.0164 | None reported |
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