VendorsMozillathunderbirdany version
Vulnerabilities

Mozilla Thunderbird any version

Ranked by severity, then by exploit likelihood. Click a CVE ID for its full record.

1742CVEs
CVE-2024-5696
By manipulating the text in an `&lt;input&gt;` tag, an attacker could have caused corrupt memory leading to a potentially exploitable crash. This vulnerability affects Firefox < 127, Firefox ESR < 115.12, and Thunderbird < 115.12.
Published 2024-06-11 · Analyzed
8.6EPSS 0.008
CVE-2022-46872
An attacker who compromised a content process could have partially escaped the sandbox to read arbitrary files via clipboard-related IPC messages.<br>*This bug only affects Thunderbird for Linux. Other operating systems are unaffected.*. This vulnerability affects Firefox < 108, Firefox ESR < 102.6, and Thunderbird < 102.6.
Published 2022-12-22 · Modified
8.6EPSS 0.008
CVE-2026-8958
Information disclosure, sandbox escape in the Security: Process Sandboxing component
Published 2026-05-19 · Analyzed
8.6EPSS 0.004
CVE-2024-2608
`AppendEncodedAttributeValue(), ExtraSpaceNeededForAttrEncoding()` and `AppendEncodedCharacters()` could have experienced integer overflows, causing underallocation of an output buffer leading to an out of bounds write. This vulnerability affects Firefox < 124, Firefox ESR < 115.9, and Thunderbird < 115.9.
Published 2024-03-19 · Analyzed
8.4EPSS 0.004
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 < 60.8, Firefox < 68, and Thunderbird < 60.8.
Published 2019-07-23 · Modified
8.3EPSS 0.026
CVE-2019-9818
A race condition is present in the crash generation server used to generate data for the crash reporter. This issue can lead to a use-after-free in the main process, resulting in a potentially exploitable crash and a sandbox escape. *Note: this vulnerability only affects Windows. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7.
Published 2019-07-23 · Modified
8.3EPSS 0.010
CVE-2026-4371
Out of bounds read in IMAP parsing
Published 2026-03-24 · Modified
8.2EPSS 0.006
CVE-2025-1943
Memory safety bugs fixed in Firefox 136 and Thunderbird 136
Published 2025-03-04 · Modified
8.2EPSS 0.004
CVE-2024-6606
Out-of-bounds read in clipboard component
Published 2024-07-09 · Analyzed
8.2EPSS 0.004
CVE-2020-6820
Under certain conditions, when handling a ReadableStream, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1.
Published 2020-04-24 · Analyzed
8.1KEVEPSS 0.071
CVE-2018-5178
A buffer overflow was found during UTF8 to Unicode string conversion within JavaScript with extremely large amounts of data. This vulnerability requires the use of a malicious or vulnerable legacy extension in order to occur. This vulnerability affects Thunderbird ESR < 52.8, Thunderbird < 52.8, and Firefox ESR < 52.8.
Published 2018-06-11 · Modified
8.1EPSS 0.050
CVE-2025-6436
Memory safety bugs fixed in Firefox 140 and Thunderbird 140
Published 2025-06-24 · Modified
8.1EPSS 0.043
CVE-2020-6819
Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1.
Published 2020-04-24 · Analyzed
8.1KEVEPSS 0.030
CVE-2016-1526
The TtfUtil:LocaLookup function in TtfUtil.cpp in Libgraphite in Graphite 2 1.2.4, as used in Mozilla Firefox before 43.0 and Firefox ESR 38.x before 38.6.1, incorrectly validates a size value, which allows remote attackers to obtain sensitive information or cause a denial of service (out-of-bounds read and application crash) via a crafted Graphite smart font.
Published 2016-02-13 · Modified
8.1EPSS 0.023
CVE-2017-7807
A mechanism that uses AppCache to hijack a URL in a domain using fallback by serving the files from a sub-path on the domain. This has been addressed by requiring fallback files be inside the manifest directory. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.
Published 2018-06-11 · Modified
8.1EPSS 0.021
CVE-2019-9815
If hyperthreading is not disabled, a timing attack vulnerability exists, similar to previous Spectre attacks. Apple has shipped macOS 10.14.5 with an option to disable hyperthreading in applications running untrusted code in a thread through a new sysctl. Firefox now makes use of it on the main thread and any worker threads. *Note: users need to update to macOS 10.14.5 in order to take advantage of this change.*. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7.
Published 2019-07-23 · Modified
8.1EPSS 0.018
CVE-2020-12387
A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability. This resulted in a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.
Published 2020-05-26 · Modified
8.1EPSS 0.014
CVE-2021-29986
A suspected race condition when calling getaddrinfo led to memory corruption and a potentially exploitable crash. *Note: This issue only affected Linux operating systems. Other operating systems are unaffected.* This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.
Published 2021-08-17 · Modified
8.1EPSS 0.013
CVE-2021-23981
A texture upload of a Pixel Buffer Object could have confused the WebGL code to skip binding the buffer used to unpack it, resulting in memory corruption and a potentially exploitable information leak or crash. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.
Published 2021-03-31 · Modified
8.1EPSS 0.011
CVE-2024-2607
Return registers were overwritten which could have allowed an attacker to execute arbitrary code. *Note:* This issue only affected Armv7-A systems. Other operating systems are unaffected. This vulnerability affects Firefox < 124, Firefox ESR < 115.9, and Thunderbird < 115.9.
Published 2024-03-19 · Analyzed
8.1EPSS 0.011
CVE-2024-5688
If a garbage collection was triggered at the right time, a use-after-free could have occurred during object transplant. This vulnerability affects Firefox < 127, Firefox ESR < 115.12, and Thunderbird < 115.12.
Published 2024-06-11 · Analyzed
8.1EPSS 0.011
CVE-2024-2612
If an attacker could find a way to trigger a particular code path in `SafeRefPtr`, it could have triggered a crash or potentially be leveraged to achieve code execution. This vulnerability affects Firefox < 124, Firefox ESR < 115.9, and Thunderbird < 115.9.
Published 2024-03-19 · Analyzed
8.1EPSS 0.010
CVE-2021-29991
Firefox incorrectly accepted a newline in a HTTP/3 header, interpretting it as two separate headers. This allowed for a header splitting attack against servers using HTTP/3. This vulnerability affects Firefox < 91.0.1 and Thunderbird < 91.0.1.
Published 2021-11-03 · Modified
8.1EPSS 0.009
CVE-2024-1553
Memory safety bugs present in Firefox 122, Firefox ESR 115.7, and Thunderbird 115.7. 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 < 123, Firefox ESR < 115.8, and Thunderbird < 115.8.
Published 2024-02-20 · Analyzed
8.1EPSS 0.009
CVE-2024-3864
Memory safety bug present in Firefox 124, Firefox ESR 115.9, and Thunderbird 115.9. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox < 125, Firefox ESR < 115.10, and Thunderbird < 115.10.
Published 2024-04-16 · Analyzed
8.1EPSS 0.009
CVE-2023-25734
After downloading a Windows <code>.url</code> shortcut from the local filesystem, an attacker could supply a remote path that would lead to unexpected network requests from the operating system. This also had the potential to leak NTLM credentials to the resource.<br>*This bug only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability affects Firefox < 110, Thunderbird < 102.8, and Firefox ESR < 102.8.
Published 2023-06-02 · Modified
8.1EPSS 0.008
CVE-2022-3033
If a Thunderbird user replied to a crafted HTML email containing a <code>meta</code> tag, with the <code>meta</code> tag having the <code>http-equiv="refresh"</code> attribute, and the content attribute specifying an URL, then Thunderbird started a network request to that URL, regardless of the configuration to block remote content. In combination with certain other HTML elements and attributes in the email, it was possible to execute JavaScript code included in the message in the context of the message compose document. The JavaScript code was able to perform actions including, but probably not limited to, read and modify the contents of the message compose document, including the quoted original message, which could potentially contain the decrypted plaintext of encrypted data in the crafted email. The contents could then be transmitted to the network, either to the URL specified in the META refresh tag, or to a different URL, as the JavaScript code could modify the URL specified in the document. This bug doesn't affect users who have changed the default Message Body display setting to 'simple html' or 'plain text'. This vulnerability affects Thunderbird < 102.2.1 and Thunderbird < 91.13.1.
Published 2022-12-22 · Modified
8.1EPSS 0.008
CVE-2026-8092
Memory safety bugs fixed in Firefox ESR 115.35.2, Firefox ESR 140.10.2 and Firefox 150.0.2
Published 2026-05-07 · Modified
8.1EPSS 0.005
CVE-2022-45414
If a Thunderbird user quoted from an HTML email, for example by replying to the email, and the email contained either a VIDEO tag with the POSTER attribute or an OBJECT tag with a DATA attribute, a network request to the referenced remote URL was performed, regardless of a configuration to block remote content. An image loaded from the POSTER attribute was shown in the composer window. These issues could have given an attacker additional capabilities when targetting releases that did not yet have a fix for CVE-2022-3033 which was reported around three months ago. This vulnerability affects Thunderbird < 102.5.1.
Published 2022-12-22 · Modified
8.1EPSS 0.005
CVE-2024-7529
The date picker could partially obscure security prompts. This could be used by a malicious site to trick a user into granting permissions. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, Firefox ESR < 128.1, Thunderbird < 128.1, and Thunderbird < 115.14.
Published 2024-08-06 · Analyzed
8.1EPSS 0.005
CVE-2025-4091
Memory safety bugs fixed in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10
Published 2025-04-29 · Modified
8.1EPSS 0.005
CVE-2025-3030
Memory safety bugs fixed in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9
Published 2025-04-01 · Modified
8.1EPSS 0.005
CVE-2026-12292
Incorrect boundary conditions in the Web Audio component
Published 2026-06-16 · Modified
8.1EPSS 0.005
CVE-2025-5268
Memory safety bugs fixed in Firefox 139, Thunderbird 139, Firefox ESR 128.11, and Thunderbird 128.11
Published 2025-05-27 · Modified
8.1EPSS 0.005
CVE-2025-4093
Memory safety bug fixed in Firefox ESR 128.10 and Thunderbird 128.10
Published 2025-04-29 · Modified
8.1EPSS 0.005
CVE-2026-0891
Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147
Published 2026-01-13 · Modified
8.1EPSS 0.005
CVE-2026-0877
Mitigation bypass in the DOM: Security component
Published 2026-01-13 · Modified
8.1EPSS 0.005
CVE-2024-11700
Malicious websites may have been able to perform user intent confirmation through tapjacking. This could have led to users unknowingly approving the launch of external applications, potentially exposing them to underlying vulnerabilities. This vulnerability affects Firefox < 133 and Thunderbird < 133.
Published 2024-11-26 · Analyzed
8.1EPSS 0.005
CVE-2026-12328
Memory safety bugs fixed in Firefox ESR 115.37, Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152
Published 2026-06-16 · Modified
8.1EPSS 0.005
CVE-2025-9185
Memory safety bugs fixed in Firefox ESR 115.27, Firefox ESR 128.14, Thunderbird ESR 128.14, Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142
Published 2025-08-19 · Modified
8.1EPSS 0.005
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