Mozilla: >> Firefox >> 121.0 Security Vulnerabilities
Insufficient escaping in the “Copy as cURL” feature could have been used to trick a user into executing unexpected code on Windows. This did not affect the application when running on other operating systems. This vulnerability affects Firefox < 144, Firefox ESR < 140.4, Thunderbird < 144, and Thunderbird < 140.4.
CVSS Score
8.1
EPSS Score
0.0
Published
2025-10-14
Memory safety bugs present in Firefox ESR 115.28, Firefox ESR 140.3, Thunderbird ESR 140.3, Firefox 143 and Thunderbird 143. 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 < 144, Firefox ESR < 115.29, Firefox ESR < 140.4, Thunderbird < 144, and Thunderbird < 140.4.
CVSS Score
8.8
EPSS Score
0.0
Published
2025-10-14
Memory safety bugs present in Firefox ESR 140.3, Thunderbird ESR 140.3, Firefox 143 and Thunderbird 143. 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 < 144, Firefox ESR < 140.4, Thunderbird < 144, and Thunderbird < 140.4.
CVSS Score
8.8
EPSS Score
0.0
Published
2025-10-14
Links in a sandboxed iframe could open an external app on Android without the required "allow-" permission. This vulnerability affects Firefox < 144 and Thunderbird < 144.
CVSS Score
6.5
EPSS Score
0.0
Published
2025-10-14
Use-after-free in MediaTrackGraphImpl::GetInstance() This vulnerability affects Firefox < 144, Firefox ESR < 140.4, Thunderbird < 144, and Thunderbird < 140.4.
CVSS Score
9.8
EPSS Score
0.001
Published
2025-10-14
Sandbox escape due to integer overflow in the Graphics: Canvas2D component. This vulnerability affects Firefox < 143.0.3.
CVSS Score
8.6
EPSS Score
0.001
Published
2025-09-30
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability affects Firefox < 143.0.3.
CVSS Score
7.5
EPSS Score
0.0
Published
2025-09-30
Memory safety bugs present in Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142. 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 < 143, Firefox ESR < 140.3, Thunderbird < 143, and Thunderbird < 140.3.
CVSS Score
8.8
EPSS Score
0.001
Published
2025-09-16
Spoofing issue in the Site Permissions component. This vulnerability affects Firefox < 143 and Thunderbird < 143.
CVSS Score
8.1
EPSS Score
0.0
Published
2025-09-16
Information disclosure, mitigation bypass in the Privacy component in Firefox for Android. This vulnerability affects Firefox < 143.
CVSS Score
7.5
EPSS Score
0.0
Published
2025-09-16