CVE-2009-1837 Use after free in n/a

What is CVE-2009-1837?

CVE-2009-1837 is a high-severity use after free vulnerability in Debian Debian Linux, published on 12 Jun 2009. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Race condition in the NPObjWrapper_NewResolve function in modules/plugin/base/src/nsJSNPRuntime.cpp in xul.dll in Mozilla Firefox 3 before 3.0.11 might allow remote attackers to execute arbitrary code via a page transition during Java applet loading, related to a use-after-free vulnerability for memory associated with a destroyed Java object.

Weakness: CWE-416, CWE-362

Which versions are affected by CVE-2009-1837?

It affects 9 products.

Products include Debian Debian Linux, Fedoraproject Fedora, Mozilla Firefox, Redhat Enterprise Linux, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Eus and 3 more.

How do I fix CVE-2009-1837?

Upgrade to a fixed version.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2009-1837 being exploited?

There is no known exploitation of CVE-2009-1837 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-jcp3-xfrr-gf86.