Firefox vulnerabilitiesAnd the versions its exploited flaws hit.
Firefox is made by Mozilla. We track 2,901 published vulnerabilities listed under that exact name, across 734 versions. 15 of them are on the list of flaws known to be exploited, the newest added on 6 October 2025. Mozilla lists newer releases under their own names, such as Firefox Esr, so check those pages too.
The most recent Firefox flaw added to the known-exploited list is CVE-2010-3765, on 6 October 2025. We keep watching the known-exploited list.
Is Firefox listed under other names? Yes.
Mozilla also lists Firefox under more specific names, such as Firefox Esr and Firefox Mobile. Flaws listed only under those names are counted on their own pages, not here. If you run one of these, open its page for its own exploited flaws.
Which versions of Firefox do the exploited flaws hit?
Each exploited flaw lists the versions it affects, usually as ranges. "before 115.16.1" means every version up to, but not including, 115.16.1. Find your version, then patch.
- CVE-2010-3765Exploited list, 6 Oct 2025
Mozilla Multiple Products Remote Code Execution Vulnerability
3.53.5.13.5.23.5.33.5.43.5.53.5.63.5.7 - CVE-2024-9680Exploited list, 15 Oct 2024
Mozilla Firefox Use-After-Free Vulnerability
before 115.16.1before 131.0.2128.1.0 to before 128.3.1 - CVE-2023-5217Exploited list, 2 Oct 2023
Google Chromium libvpx Heap Buffer Overflow Vulnerability
before 115.3.1before 118.0.1before 118.1 - CVE-2023-4863Exploited list, 13 Sep 2023
Google Chromium WebP Heap-Based Buffer Overflow Vulnerability
before 102.15.1before 117.0.1115.1.0 to before 115.2.1 - CVE-2016-9079Exploited list, 22 Jun 2023
Mozilla Firefox, Firefox ESR, and Thunderbird Use-After-Free Vulnerability
before 50.0.2before 45.5.1 - CVE-2015-4495Exploited list, 25 May 2022
Mozilla Firefox Security Feature Bypass Vulnerability
before 39.0.338.0 to before 38.1.1 - CVE-2019-11707Exploited list, 23 May 2022
Mozilla Firefox and Thunderbird Type Confusion Vulnerability
before 60.7.1before 67.0.3 - CVE-2019-11708Exploited list, 23 May 2022
Mozilla Firefox and Thunderbird Sandbox Escape Vulnerability
before 60.7.2before 67.0.4 - CVE-2013-1690Exploited list, 28 Mar 2022
Mozilla Firefox and Thunderbird Denial-of-Service Vulnerability
before 22.017.0 to before 17.0.7 - CVE-2022-26485Exploited list, 7 Mar 2022
Mozilla Firefox Use-After-Free Vulnerability
before 91.6.1before 97.0.2before 97.3.0 - CVE-2022-26486Exploited list, 7 Mar 2022
Mozilla Firefox Use-After-Free Vulnerability
before 91.6.1before 97.0.2before 97.3.0 - CVE-2013-1675Exploited list, 3 Mar 2022
Mozilla Firefox Information Disclosure Vulnerability
before 21.017.0 to before 17.0.6 - CVE-2020-6820Exploited list, 3 Nov 2021
Mozilla Firefox And Thunderbird Use-After-Free Vulnerability
before 68.6.1before 74.0.1 - CVE-2020-6819Exploited list, 3 Nov 2021
Mozilla Firefox And Thunderbird Use-After-Free Vulnerability
before 68.6.1before 74.0.1 - CVE-2019-17026Exploited list, 3 Nov 2021
Mozilla Firefox And Thunderbird Type Confusion Vulnerability
before 68.4.1before 72.0.1
Which Firefox vulnerabilities are being exploited?
15 flaws are on the government list of vulnerabilities known to be exploited. These are the ones criminals are using now, so they go first, whatever their severity score says.
- 9.8Mozilla Multiple Products Remote Code Execution Vulnerability
Mozilla Firefox, SeaMonkey, and Thunderbird contain an unspecified vulnerability when JavaScript is enabled.
- 9.8Mozilla Firefox Use-After-Free Vulnerability
Mozilla Firefox and Firefox ESR contain a use-after-free vulnerability in Animation timelines that allows for code execution in the content process.
- 8.8Google Chromium libvpx Heap Buffer Overflow Vulnerability
Google Chromium libvpx contains a heap buffer overflow vulnerability in vp8 encoding that allows a remote attacker to potentially exploit heap corruption via a crafted HTML page.
- 8.8Google Chromium WebP Heap-Based Buffer Overflow Vulnerability
Google Chromium WebP contains a heap-based buffer overflow vulnerability that allows a remote attacker to perform an out-of-bounds memory write via a crafted HTML page.
- 7.5Mozilla Firefox, Firefox ESR, and Thunderbird Use-After-Free Vulnerability
Mozilla Firefox, Firefox ESR, and Thunderbird contain a use-after-free vulnerability in SVG Animation, targeting Firefox and Tor browser users on Windows.
- 8.8Mozilla Firefox Security Feature Bypass Vulnerability
Moxilla Firefox allows remote attackers to bypass the Same Origin Policy to read arbitrary files or gain privileges.
- 8.8Mozilla Firefox and Thunderbird Type Confusion Vulnerability
Mozilla Firefox and Thunderbird contain a type confusion vulnerability that can occur when manipulating JavaScript objects due to issues in Array.pop, allowing for an exploitable crash.
- 10.0Mozilla Firefox and Thunderbird Sandbox Escape Vulnerability
Mozilla Firefox and Thunderbird contain a sandbox escape vulnerability that could result in remote code execution.
Which Firefox flaws are most likely to be used?
Ranked by the latest exploit-likelihood forecast: the chance each flaw is used in an attack in the next 30 days. A high severity score on its own doesn't tell you that. Flaws shared by many other makers' products are left out.
- 83%
Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before 3.1.6 and 3.0.x before 3.0.10, and SeaMonkey 2.x before 2.0.10, when JavaScript is enabled, allows remote attackers to execute...
- 79%CVE-2006-3677High
Mozilla Firefox 1.5 before 1.5.0.5 and SeaMonkey before 1.0.3 allows remote attackers to execute arbitrary code by changing certain properties of the window navigator object (window.navigator) that are accessed when...
- 74%CVE-2011-0065Critical
Use-after-free vulnerability in Mozilla Firefox before 3.5.19 and 3.6.x before 3.6.17, and SeaMonkey before 2.0.14, allows remote attackers to execute arbitrary code via vectors related to OBJECT's mChannel.
- 73%CVE-2013-0758Critical
Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderbird ESR 10.x before 10.0.12 and 17.x before 17.0.2, and SeaMonkey before 2.15 allow remote...
- 73%CVE-2011-3389Medium
The SSL protocol, as used in certain configurations in Microsoft Windows and Microsoft Internet Explorer, Mozilla Firefox, Google Chrome, Opera, and other products, encrypts data by using CBC mode with chained...
- 71%CVE-2006-0295Medium
Mozilla Firefox 1.5, Thunderbird 1.5 if Javascript is enabled in mail, and SeaMonkey before 1.0 might allow remote attackers to execute arbitrary code via the QueryInterface method of the built-in Location and...
- 70%CVE-2011-0073Critical
Mozilla Firefox before 3.5.19 and 3.6.x before 3.6.17, and SeaMonkey before 2.0.14, does not properly use nsTreeRange data structures, which allows remote attackers to execute arbitrary code via unspecified vectors...
- 70%CVE-2011-3658High
The SVG implementation in Mozilla Firefox 8.0, Thunderbird 8.0, and SeaMonkey 2.5 does not properly interact with DOMAttrModified event handlers, which allows remote attackers to cause a denial of service...
- 69%
Mozilla Firefox before 22.0, Firefox ESR 17.x before 17.0.7, Thunderbird before 17.0.7, and Thunderbird ESR 17.x before 17.0.7 do not properly handle onreadystatechange events in conjunction with page reloading,...
Running Firefox? We'll keep checking.
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1 flaw being exploited affects software Acme tracks
Mozilla Firefox, SeaMonkey, and Thunderbird contain an unspecified vulnerability when JavaScript is enabled. This allows remote attackers to execute arbitrary code via vectors related to nsCSSFrameConstructor::ContentAppended, the appendChild method, incorrect index tracking, and the creation of multiple frames, which triggers memory corruption.
- Matched to
- Firefox on Acme's software list
- What to do
- Patch first, then check for signs of use
Sent to the alert recipients Acme chose. Also in the app and to Acme's webhook.
We track 2,901 published vulnerabilities listed under the name Firefox, across 734 versions. The most recent Firefox flaw added to the known-exploited list is CVE-2010-3765, on 6 October 2025.
15 are on the list of flaws known to be exploited. The most recently added are CVE-2010-3765, CVE-2024-9680 and CVE-2023-5217.
Mozilla also lists Firefox under more specific names, such as Firefox Esr and Firefox Mobile. Flaws listed only under those names are counted on their own pages, not here. Open the release you run to see its own list.
Each flaw names its own versions, usually as ranges. The newest, CVE-2010-3765, affects 3.5, 3.5.1, 3.5.2, 3.5.3 and more. The versions for every exploited flaw are listed on this page.
Create a Precursor Intelligence account and track Firefox. We match it against every published flaw, give each one a risk score from 0 to 100 and keep watching, so you hear about new ones as soon as we know, by email, in the app or by webhook.