# CVE-2009-3555: Apache Tomcat affected by vulnerability in TLS and SSL protocol > Man-in-the-middle attackers can inject data into HTTPS sessions by exploiting improper TLS renegotiation handling in various SSL/TLS libraries and servers. - **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:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 9 Nov 2009 - **Updated:** 27 May 2026 - **Also known as:** DEBIAN-CVE-2009-3555, DSA-2141-2, GHSA-f7w7-6pjc-wwm6, RHSA-2010:0155, RHSA-2010:0164, RHSA-2010:0165 ## What is CVE-2009-3555? CVE-2009-3555 is a critical vulnerability in Apache Http Server, published on 9 Nov 2009. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description The TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in Microsoft Internet Information Services (IIS) 7.0, mod_ssl in the Apache HTTP Server 2.2.14 and earlier, OpenSSL before 0.9.8l, GnuTLS 2.8.5 and earlier, Mozilla Network Security Services (NSS) 3.12.4 and earlier, multiple Cisco products, and other products, does not properly associate renegotiation handshakes with an existing connection, which allows man-in-the-middle attackers to insert data into HTTPS sessions, and possibly other types of sessions protected by TLS or SSL, by sending an unauthenticated request that is processed retroactively by a server in a post-renegotiation context, related to a "plaintext injection" attack, aka the "Project Mogul" issue. Weakness: CWE-295 (Improper Certificate Validation), CWE-300 (Channel Accessible by Non-Endpoint) ## Which versions are affected by CVE-2009-3555? 6 open source packages ship an affected version, including org.apache.tomcat:tomcat. It affects 8 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `org.apache.tomcat:tomcat` | Maven | From 5.0.0 | 5.5.33 | | `org.apache.tomcat:tomcat` | Maven | From 5.0.0 | 5.5.33 | | `org.apache.tomcat:tomcat` | Maven | From 6.0.0 | 6.0.32 | | `org.apache.tomcat:tomcat` | Maven | From 6.0.0 | 6.0.32 | | `org.apache.tomcat:tomcat` | Maven | From 7.0.0 | 7.0.10 | | `org.apache.tomcat:tomcat` | Maven | From 7.0.0 | 7.0.10 | | `nspr` | Red Hat:enterprise_linux:4::as | All versions | 0:4.8.4-1.1.el4_8 | | `nspr-debuginfo` | Red Hat:enterprise_linux:4::as | All versions | 0:4.8.4-1.1.el4_8 | | `nspr-devel` | Red Hat:enterprise_linux:4::as | All versions | 0:4.8.4-1.1.el4_8 | | `nss` | Red Hat:enterprise_linux:4::as | All versions | 0:3.12.6-1.el4_8 | | `nss-debuginfo` | Red Hat:enterprise_linux:4::as | All versions | 0:3.12.6-1.el4_8 | | `nss-devel` | Red Hat:enterprise_linux:4::as | All versions | 0:3.12.6-1.el4_8 | | `nss-tools` | Red Hat:enterprise_linux:4::as | All versions | 0:3.12.6-1.el4_8 | | `nspr` | Red Hat:enterprise_linux:4::desktop | All versions | 0:4.8.4-1.1.el4_8 | | `nspr-debuginfo` | Red Hat:enterprise_linux:4::desktop | All versions | 0:4.8.4-1.1.el4_8 | | `nspr-devel` | Red Hat:enterprise_linux:4::desktop | All versions | 0:4.8.4-1.1.el4_8 | | `nss` | Red Hat:enterprise_linux:4::desktop | All versions | 0:3.12.6-1.el4_8 | | `nss-debuginfo` | Red Hat:enterprise_linux:4::desktop | All versions | 0:3.12.6-1.el4_8 | | `nss-devel` | Red Hat:enterprise_linux:4::desktop | All versions | 0:3.12.6-1.el4_8 | | `nss-tools` | Red Hat:enterprise_linux:4::desktop | All versions | 0:3.12.6-1.el4_8 | | `nspr` | Red Hat:enterprise_linux:4::es | All versions | 0:4.8.4-1.1.el4_8 | | `nspr-debuginfo` | Red Hat:enterprise_linux:4::es | All versions | 0:4.8.4-1.1.el4_8 | | `nspr-devel` | Red Hat:enterprise_linux:4::es | All versions | 0:4.8.4-1.1.el4_8 | | `nss` | Red Hat:enterprise_linux:4::es | All versions | 0:3.12.6-1.el4_8 | | `nss-debuginfo` | Red Hat:enterprise_linux:4::es | All versions | 0:3.12.6-1.el4_8 | | `nss-devel` | Red Hat:enterprise_linux:4::es | All versions | 0:3.12.6-1.el4_8 | | `nss-tools` | Red Hat:enterprise_linux:4::es | All versions | 0:3.12.6-1.el4_8 | | `nspr` | Red Hat:enterprise_linux:4::ws | All versions | 0:4.8.4-1.1.el4_8 | | `nspr-debuginfo` | Red Hat:enterprise_linux:4::ws | All versions | 0:4.8.4-1.1.el4_8 | | `nspr-devel` | Red Hat:enterprise_linux:4::ws | All versions | 0:4.8.4-1.1.el4_8 | | `nss` | Red Hat:enterprise_linux:4::ws | All versions | 0:3.12.6-1.el4_8 | | `nss-debuginfo` | Red Hat:enterprise_linux:4::ws | All versions | 0:3.12.6-1.el4_8 | | `nss-devel` | Red Hat:enterprise_linux:4::ws | All versions | 0:3.12.6-1.el4_8 | | `nss-tools` | Red Hat:enterprise_linux:4::ws | All versions | 0:3.12.6-1.el4_8 | | `nspr` | Red Hat:enterprise_linux:5::client | All versions | 0:4.8.4-1.el5_4 | | `nspr-debuginfo` | Red Hat:enterprise_linux:5::client | All versions | 0:4.8.4-1.el5_4 | | `nss` | Red Hat:enterprise_linux:5::client | All versions | 0:3.12.6-1.el5_4 | | `nss-debuginfo` | Red Hat:enterprise_linux:5::client | All versions | 0:3.12.6-1.el5_4 | | `nss-tools` | Red Hat:enterprise_linux:5::client | All versions | 0:3.12.6-1.el5_4 | | `openssl097a` | Red Hat:enterprise_linux:5::client | All versions | 0:0.9.7a-9.el5_4.2 | Products: Apache Http Server, Canonical Ubuntu Linux, Debian Debian Linux, F5 Nginx, Fedoraproject Fedora, Gnu Gnutls, Mozilla Nss, Openssl Openssl. ## How do I fix CVE-2009-3555? Upgrade org.apache.tomcat:tomcat to a fixed version for your release line: 5.5.33, 6.0.32 or 7.0.10. ## Is CVE-2009-3555 being exploited? It is not confirmed as exploited in the wild, but public exploit code for CVE-2009-3555 exists. Public exploit code: - A TLS server using a vendored fork of the Go TLS stack that has renegotation indication extension forcibly disabled. (github_poc): https://github.com/johnwchadwick/cve-2009-3555-test-server - Mozilla NSS - NULL Character CA SSL Certificate Validation Security Bypass (exploitdb) - TLS - Renegotiation (exploitdb) ## Other vulnerabilities in Apache Http Server - [CVE-2021-42013](https://insights.sbomify.com/CVE-2021-42013/): Apache HTTP Server Path Traversal (critical 9.8, exploited in the wild) - [CVE-2024-38475](https://insights.sbomify.com/CVE-2024-38475/): Apache HTTP Server Improper Escaping of Output (critical 9.1, exploited in the wild) - [CVE-2021-40438](https://insights.sbomify.com/CVE-2021-40438/): Apache HTTP Server-Side Request Forgery (SSRF) (critical 9.0, exploited in the wild) - [CVE-2019-0211](https://insights.sbomify.com/CVE-2019-0211/): Apache HTTP Server Privilege Escalation (high 7.8, exploited in the wild) - [CVE-2021-41773](https://insights.sbomify.com/CVE-2021-41773/): Apache HTTP Server Path Traversal (high 7.5, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2009-3555 and fix it if it is affected. What it is: CVE-2009-3555 is a critical vulnerability in Apache Http Server, published on 9 Nov 2009. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2009-3555 exists. Affected packages and fixed versions: - org.apache.tomcat:tomcat (Maven): affected from 5.0.0; fixed in 5.5.33 - org.apache.tomcat:tomcat (Maven): affected from 5.0.0; fixed in 5.5.33 - org.apache.tomcat:tomcat (Maven): affected from 6.0.0; fixed in 6.0.32 - org.apache.tomcat:tomcat (Maven): affected from 6.0.0; fixed in 6.0.32 - org.apache.tomcat:tomcat (Maven): affected from 7.0.0; fixed in 7.0.10 - org.apache.tomcat:tomcat (Maven): affected from 7.0.0; fixed in 7.0.10 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-2009-3555/ (Markdown: https://insights.sbomify.com/CVE-2009-3555/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2009-3555 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2009-3555 - OSV: https://osv.dev/vulnerability/CVE-2009-3555 --- From sbomify Insights: https://insights.sbomify.com/CVE-2009-3555/ Summaries are generated and may contain mistakes; the official description above is the record.