CVE-2020-12406

Mozilla Developer Iain Ireland discovered a missing type check during unboxed objects removal, resulting in a crash. We presume that with enough effort that it could be exploited to run arbitrary code. This vulnerability affects Thunderbird < 68.9.0, Firefox < 77, and Firefox ESR < 68.9.

CVE-2021-23978

Mozilla developers reported memory safety bugs present in Firefox 85 and Firefox ESR 78.7. 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 < 86, Thunde...

CVE-2023-23602

A mishandled security check when creating a WebSocket in a WebWorker caused the Content Security Policy connect-src header to be ignored. This could lead to connections to restricted origins from inside WebWorkers. This vulnerability affects Firefox < 109, Thunderbird < 102.7, and Firefox ESR...

CVE-2024-6615

Memory safety bugs present in Firefox 127 and Thunderbird 127. 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 < 128 and Thunderbird < 128.

CVE-2024-9400

A potential memory corruption vulnerability could be triggered if an attacker had the ability to trigger an OOM at a specific moment during JIT compilation. This vulnerability affects Firefox < 131, Firefox ESR < 128.3, Thunderbird < 128.3, and Thunderbird < 131.

CVE-2020-6807

When a device was changed while a stream was about to be destroyed, the <code>stream-reinit</code> task may have been executed after the stream was destroyed, causing a use-after-free and a potentially exploitable crash. This vulnerability affects Thunderbird &lt; 68.6, Firefox &lt; 74, Firefox &lt...

CVE-2025-1017

Memory safety bugs present in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and Thunderbird 128.6. 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 &lt;...

CVE-2021-23960

Performing garbage collection on re-declared JavaScript variables resulted in a user-after-poison, and a potentially exploitable crash. This vulnerability affects Firefox &lt; 85, Thunderbird &lt; 78.7, and Firefox ESR &lt; 78.7.

CVE-2024-11691

Certain WebGL operations on Apple silicon M series devices could have lead to an out-of-bounds write and memory corruption due to a flaw in Apple's GPU driver.This bug only affected the application on Apple M series hardware. Other platforms were unaffected. This vulnerability affects Firefox &lt; ...

CVE-2024-9393

An attacker could, via a specially crafted multipart response, execute arbitrary JavaScript under the resource://pdf.js origin. This could allow them to access cross-origin PDF content. This access is limited to "same site" documents by the Site Isolation feature on desktop clients, but full cross-...

CVE-2019-17012

Mozilla developers reported memory safety bugs present in Firefox 70 and Firefox ESR 68.2. 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 Thunderbird &lt; 68.3, ...

CVE-2019-9811

As part of a winning Pwn2Own entry, a researcher demonstrated a sandbox escape by installing a malicious language pack and then opening a browser feature that used the compromised translation. This vulnerability affects Firefox ESR &lt; 60.8, Firefox &lt; 68, and Thunderbird &lt; 60.8.

CVE-2020-26959

During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox &lt; 83, Firefox ESR &lt; 78.5, and Thunderbird &lt; 78.5.

CVE-2023-6209

Relative URLs starting with three slashes were incorrectly parsed, and a path-traversal "/../" part in the path could be used to override the specified host. This could contribute to security problems in web sites. This vulnerability affects Firefox &lt; 120, Firefox ESR &lt; 115.5.0, and Thunderbi...

CVE-2024-8381

A potentially exploitable type confusion could be triggered when looking up a property name on an object being used as the with environment. This vulnerability affects Firefox &lt; 130, Firefox ESR &lt; 128.2, Firefox ESR &lt; 115.15, Thunderbird &lt; 128.2, and Thunderbird &lt; 115.15.

CVE-2025-1011

A bug in WebAssembly code generation could have lead to a crash. It may have been possible for an attacker to leverage this to achieve code execution. This vulnerability affects Firefox &lt; 135, Firefox ESR &lt; 128.7, Thunderbird &lt; 128.7, and Thunderbird &lt; 135.

CVE-2025-1016

Memory safety bugs present in Firefox 134, Thunderbird 134, Firefox ESR 115.19, Firefox ESR 128.6, Thunderbird 115.19, and Thunderbird 128.6. 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....

CVE-2019-11764

Mozilla developers and community members reported memory safety bugs present in Firefox 69 and Firefox ESR 68.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could be exploited to run arbitrary code. This vulnerability affects Firefox ...

CVE-2021-23995

When Responsive Design Mode was enabled, it used references to objects that were previously freed. We presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR &lt; 78.10, Thunderbird &lt; 78.10, and Firefox &lt; 88.

CVE-2021-23998

Through complicated navigations with new windows, an HTTP page could have inherited a secure lock icon from an HTTPS page. This vulnerability affects Firefox ESR &lt; 78.10, Thunderbird &lt; 78.10, and Firefox &lt; 88.

CVE-2021-43537

An incorrect type conversion of sizes from 64bit to 32bit integers allowed an attacker to corrupt memory leading to a potentially exploitable crash. This vulnerability affects Thunderbird &lt; 91.4.0, Firefox ESR &lt; 91.4.0, and Firefox &lt; 95.

CVE-2018-18493

A buffer overflow can occur in the Skia library during buffer offset calculations with hardware accelerated canvas 2D actions due to the use of 32-bit calculations instead of 64-bit. This results in a potentially exploitable crash. This vulnerability affects Thunderbird &lt; 60.4, Firefox ESR &lt; ...

CVE-2020-26968

Mozilla developers reported memory safety bugs present in Firefox 82 and Firefox ESR 78.4. 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 &lt; 83, Firefo...

CVE-2024-11698

A flaw in handling fullscreen transitions may have inadvertently caused the application to become stuck in fullscreen mode when a modal dialog was opened during the transition. This issue left users unable to exit fullscreen mode using standard actions like pressing "Esc" or accessing right-click m...

CVE-2024-7519

Insufficient checks when processing graphics shared memory could have led to memory corruption. This could be leveraged by an attacker to perform a sandbox escape. This vulnerability affects Firefox &lt; 129, Firefox ESR &lt; 115.14, Firefox ESR &lt; 128.1, Thunderbird &lt; 128.1, and Thunderbird &...

CVE-2018-18492

A use-after-free vulnerability can occur after deleting a selection element due to a weak reference to the select element in the options collection. This results in a potentially exploitable crash. This vulnerability affects Thunderbird &lt; 60.4, Firefox ESR &lt; 60.4, and Firefox &lt; 64.

CVE-2024-5691

By tricking the browser with a X-Frame-Options header, a sandboxed iframe could have presented a button that, if clicked by a user, would bypass restrictions to open a new window. This vulnerability affects Firefox &lt; 127, Firefox ESR &lt; 115.12, and Thunderbird &lt; 115.12.

CVE-2024-6600

Due to large allocation checks in Angle for GLSL shaders being too lenient an out-of-bounds access could occur when allocating more than 8192 ints in private shader memory on mac OS. This vulnerability affects Firefox &lt; 128, Firefox ESR &lt; 115.13, Thunderbird &lt; 115.13, and Thunderbird &lt; ...

CVE-2024-6607

It was possible to prevent a user from exiting pointerlock when pressing escape and to overlay customValidity notifications from a &lt;select&gt; element over certain permission prompts. This could be used to confuse a user into giving a site unintended permissions. This vulnerability affects Firef...

CVE-2025-1020

Memory safety bugs present in Firefox 134 and Thunderbird 134. 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 &lt; 135 and Thunderbird &lt; 135.

CVE-2019-11759

An attacker could have caused 4 bytes of HMAC output to be written past the end of a buffer stored on the stack. This could be used by an attacker to execute arbitrary code or more likely lead to a crash. This vulnerability affects Firefox &lt; 70, Thunderbird &lt; 68.2, and Firefox ESR &lt; 68.2.

CVE-2020-12410

Mozilla developers reported memory safety bugs present in Firefox 76 and Firefox ESR 68.8. 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 Thunderbird &lt; 68.9.0...

CVE-2020-26956

In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS. This vulnerability affects Firefox &lt; 83, Firefox ESR &lt; 78.5, and Thunderbird &lt; 78.5.

CVE-2021-38507

The Opportunistic Encryption feature of HTTP2 (RFC 8164) allows a connection to be transparently upgraded to TLS while retaining the visual properties of an HTTP connection, including being same-origin with unencrypted connections on port 80. However, if a second encrypted port on the same IP addre...

CVE-2024-5693

Offscreen Canvas did not properly track cross-origin tainting, which could be used to access image data from another site in violation of same-origin policy. This vulnerability affects Firefox &lt; 127, Firefox ESR &lt; 115.12, and Thunderbird &lt; 115.12.

CVE-2024-5702

Memory corruption in the networking stack could have led to a potentially exploitable crash. This vulnerability affects Firefox &lt; 125, Firefox ESR &lt; 115.12, and Thunderbird &lt; 115.12.

CVE-2024-6611

A nested iframe, triggering a cross-site navigation, could send SameSite=Strict or Lax cookies. This vulnerability affects Firefox &lt; 128 and Thunderbird &lt; 128.

CVE-2025-0239

When using Alt-Svc, ALPN did not properly validate certificates when the original server is redirecting to an insecure site. This vulnerability affects Firefox &lt; 134, Firefox ESR &lt; 128.6, Thunderbird &lt; 134, and Thunderbird &lt; 128.6.

CVE-2019-17010

Under certain conditions, when checking the Resist Fingerprinting preference during device orientation checks, a race condition could have caused a use-after-free and a potentially exploitable crash. This vulnerability affects Thunderbird &lt; 68.3, Firefox ESR &lt; 68.3, and Firefox &lt; 71.

CVE-2019-9817

Images from a different domain can be read using a canvas object in some circumstances. This could be used to steal image data from a different site in violation of same-origin policy. This vulnerability affects Thunderbird &lt; 60.7, Firefox &lt; 67, and Firefox ESR &lt; 60.7.

CVE-2020-26961

When DNS over HTTPS is in use, it intentionally filters RFC1918 and related IP ranges from the responses as these do not make sense coming from a DoH resolver. However when an IPv4 address was mapped through IPv6, these addresses were erroneously let through, leading to a potential DNS Rebinding at...

CVE-2020-6805

When removing data about an origin whose tab was recently closed, a use-after-free could occur in the Quota manager, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird &lt; 68.6, Firefox &lt; 74, Firefox &lt; ESR68.6, and Firefox ESR &lt; 68.6.

CVE-2024-10459

An attacker could have caused a use-after-free when accessibility was enabled, leading to a potentially exploitable crash. This vulnerability affects Firefox &lt; 132, Firefox ESR &lt; 128.4, Firefox ESR &lt; 115.17, Thunderbird &lt; 128.4, and Thunderbird &lt; 132.

CVE-2024-5692

On Windows 10, when using the 'Save As' functionality, an attacker could have tricked the browser into saving the file with a disallowed extension such as .url by including an invalid character in the extension. Note: This issue only affected Windows operating systems. Other operating systems are u...

CVE-2024-7528

Incorrect garbage collection interaction in IndexedDB could have led to a use-after-free. This vulnerability affects Firefox &lt; 129, Firefox ESR &lt; 128.1, and Thunderbird &lt; 128.1.

CVE-2024-4769

When importing resources using Web Workers, error messages would distinguish the difference between application/javascript responses and non-script responses. This could have been abused to learn information cross-origin. This vulnerability affects Firefox &lt; 126, Firefox ESR &lt; 115.11, and Thu...

CVE-2024-4777

Memory safety bugs present in Firefox 125, Firefox ESR 115.10, and Thunderbird 115.10. 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 &lt; 126, Firefox E...

CVE-2024-6603

In an out-of-memory scenario an allocation could fail but free would have been called on the pointer afterwards leading to memory corruption. This vulnerability affects Firefox &lt; 128, Firefox ESR &lt; 115.13, Thunderbird &lt; 115.13, and Thunderbird &lt; 128.

CVE-2019-11762

If two same-origin documents set document.domain differently to become cross-origin, it was possible for them to call arbitrary DOM methods/getters/setters on the now-cross-origin window. This vulnerability affects Firefox &lt; 70, Thunderbird &lt; 68.2, and Firefox ESR &lt; 68.2.

CVE-2024-5690

By monitoring the time certain operations take, an attacker could have guessed which external protocol handlers were functional on a user's system. This vulnerability affects Firefox &lt; 127, Firefox ESR &lt; 115.12, and Thunderbird &lt; 115.12.