# CVE-2010-3765: Mozilla Multiple Products Remote Code Execution > Remote attackers can execute arbitrary code via memory corruption in Firefox, Thunderbird, and SeaMonkey when JavaScript is enabled. - **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`) - **Exploited in the wild:** Yes, since 6 Oct 2025 (CISA KEV) - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 27 Oct 2010 - **Updated:** 22 Oct 2025 - **Also known as:** GHSA-cmrc-q43h-xrrq, RHSA-2010:0808, RHSA-2010:0809, RHSA-2010:0810, RHSA-2010:0812 ## What is CVE-2010-3765? CVE-2010-3765 is a critical memory corruption vulnerability in Mozilla Firefox, published on 27 Oct 2010. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description 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 arbitrary code via vectors related to nsCSSFrameConstructor::ContentAppended, the appendChild method, incorrect index tracking, and the creation of multiple frames, which triggers memory corruption, as exploited in the wild in October 2010 by the Belmoo malware. Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) ## Which versions are affected by CVE-2010-3765? It affects 3 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `seamonkey` | Red Hat:enterprise_linux:3::as | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-chat` | Red Hat:enterprise_linux:3::as | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-debuginfo` | Red Hat:enterprise_linux:3::as | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-devel` | Red Hat:enterprise_linux:3::as | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-dom-inspector` | Red Hat:enterprise_linux:3::as | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-js-debugger` | Red Hat:enterprise_linux:3::as | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-mail` | Red Hat:enterprise_linux:3::as | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-nspr` | Red Hat:enterprise_linux:3::as | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-nspr-devel` | Red Hat:enterprise_linux:3::as | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-nss` | Red Hat:enterprise_linux:3::as | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-nss-devel` | Red Hat:enterprise_linux:3::as | All versions | 0:1.0.9-0.62.el3 | | `seamonkey` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-chat` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-debuginfo` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-devel` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-dom-inspector` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-js-debugger` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-mail` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-nspr` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-nspr-devel` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-nss` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-nss-devel` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.0.9-0.62.el3 | | `seamonkey` | Red Hat:enterprise_linux:3::es | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-chat` | Red Hat:enterprise_linux:3::es | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-debuginfo` | Red Hat:enterprise_linux:3::es | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-devel` | Red Hat:enterprise_linux:3::es | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-dom-inspector` | Red Hat:enterprise_linux:3::es | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-js-debugger` | Red Hat:enterprise_linux:3::es | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-mail` | Red Hat:enterprise_linux:3::es | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-nspr` | Red Hat:enterprise_linux:3::es | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-nspr-devel` | Red Hat:enterprise_linux:3::es | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-nss` | Red Hat:enterprise_linux:3::es | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-nss-devel` | Red Hat:enterprise_linux:3::es | All versions | 0:1.0.9-0.62.el3 | | `seamonkey` | Red Hat:enterprise_linux:3::ws | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-chat` | Red Hat:enterprise_linux:3::ws | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-debuginfo` | Red Hat:enterprise_linux:3::ws | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-devel` | Red Hat:enterprise_linux:3::ws | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-dom-inspector` | Red Hat:enterprise_linux:3::ws | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-js-debugger` | Red Hat:enterprise_linux:3::ws | All versions | 0:1.0.9-0.62.el3 | | `seamonkey-mail` | Red Hat:enterprise_linux:3::ws | All versions | 0:1.0.9-0.62.el3 | Products: Mozilla Firefox, Mozilla Seamonkey, Mozilla Thunderbird. ## How do I fix CVE-2010-3765? Upgrade to a fixed version. US federal agencies must fix it by 27 Oct 2025. ## Is CVE-2010-3765 being exploited? Yes. Attackers have exploited CVE-2010-3765 in the wild since at least 6 Oct 2025. Public exploit code: - Mozilla Firefox Interleaved document.write/appendChild Memory Corruption (metasploit) - Mozilla Firefox - Interleaving 'document.write' / 'appendChild' Denial of Service (exploitdb) - Mozilla Firefox - Simplified Memory Corruption (PoC) (exploitdb) - Mozilla Firefox 3.6.8 < 3.6.11 - Interleaving 'document.write' / 'appendChild' Remote Overflow (exploitdb) - Mozilla Firefox - Interleaving 'document.write' / 'appendChild' (Metasploit) (exploitdb) ## Other vulnerabilities in Mozilla Firefox - [CVE-2019-11708](https://insights.sbomify.com/CVE-2019-11708/): Mozilla Firefox and Thunderbird Sandbox Escape (critical 10.0, exploited in the wild) - [CVE-2022-26486](https://insights.sbomify.com/CVE-2022-26486/): Mozilla Firefox Use-After-Free (critical 9.6, exploited in the wild) - [CVE-2022-26485](https://insights.sbomify.com/CVE-2022-26485/): Mozilla Firefox Use-After-Free (high 8.8, exploited in the wild) - [CVE-2019-11707](https://insights.sbomify.com/CVE-2019-11707/): Mozilla Firefox and Thunderbird Type Confusion (high 8.8, exploited in the wild) - [CVE-2020-6819](https://insights.sbomify.com/CVE-2020-6819/): Mozilla Firefox And Thunderbird Use-After-Free (high 8.1, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2010-3765 and fix it if it is affected. What it is: CVE-2010-3765 is a critical memory corruption vulnerability in Mozilla Firefox, published on 27 Oct 2010. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: Yes. Attackers have exploited CVE-2010-3765 in the wild since at least 6 Oct 2025. Affected product: Mozilla Firefox. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2010-3765/ (Markdown: https://insights.sbomify.com/CVE-2010-3765/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2010-3765 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2010-3765 - OSV: https://osv.dev/vulnerability/CVE-2010-3765 --- From sbomify Insights: https://insights.sbomify.com/CVE-2010-3765/ Summaries are generated and may contain mistakes; the official description above is the record.