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CVE-2013-2423 is an unspecified vulnerability in the HotSpot component of Oracle Java Runtime Environment affecting Oracle Java SE 7 Update 17 and earlier, and OpenJDK 7. Oracle’s public advisory described it only as allowing remote attackers to affect integrity via unknown vectors related to HotSpot. The supplied context further notes unconfirmed researcher claims that exploitation involved bypassing permission checks through the MethodHandles method and using reflection and type confusion to modify arbitrary public final fields, including integer and double fields, in order to disable the Java Security Manager. The vulnerability was exploited through malicious Java content delivered via exploit kits, including applet/JNLP-based delivery, and was also associated in observed campaigns with Java warning or security prompt bypass behavior using the __applet_ssv_validated=true parameter.
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What an attacker gets, and what they’ve been doing with it.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a single Metasploit module: 'java_jre17_reflection_types.rb', which exploits a type confusion vulnerability in Oracle Java Runtime Environment (JRE) 7u17 and earlier (CVE-2013-2423). The exploit leverages Java Reflection to bypass the Java sandbox and achieve remote code execution via a malicious Java applet or JNLP file. The module is weaponized, supporting multiple payload types (Java, Windows, Linux, Mac OS X) and can deliver arbitrary code to the victim. It is designed to be served via a malicious HTTP server, typically as part of a browser-based attack. The exploit includes mechanisms to bypass click-to-play protections, especially on Internet Explorer using Java Web Start. The code references several fingerprintable endpoints, including official Java download and update URLs. The structure is typical for a Metasploit browser exploit module, with methods for serving the malicious JNLP, JAR, and HTML files, and for dynamically generating class and payload names to evade detection.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Java vulnerability released in April 2013 that was rapidly adopted by multiple exploit kits, underscoring fast criminal operationalization.
A Java security warning bypass vulnerability used by the exploit kit to suppress or bypass Java prompts and facilitate malicious applet execution on vulnerable Java 7 installations.
A Java vulnerability included in the Private Exploit Pack and actively delivered through the pack's exploit chain.
A Java vulnerability exploited via malicious JAR files to deliver the 9002 RAT in targeted attacks.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.