Loading vulnerability…
CVE-2015-6420 is an insecure deserialization vulnerability affecting serialized-object interfaces in multiple Cisco product families that use the Apache Commons Collections library. A remote attacker can submit a crafted serialized Java object to a vulnerable interface, causing arbitrary command execution. Java applications that directly use Apache Commons Collections or include it in their classpath may also be affected when they deserialize untrusted data.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository demonstrates an exploit for CVE-2015-6420, a Java deserialization vulnerability affecting applications using Apache Commons Collections 3.2.1. The main exploit logic is implemented in 'src/main/java/org/example/Main.java', which constructs a malicious serialized object using a Commons Collections gadget chain (ChainedTransformer, InvokerTransformer, etc.) and the AnnotationInvocationHandler class. The exploit triggers arbitrary command execution by deserializing this object, which in turn runs a Python script ('exp.py') as a demonstration payload. The Python script writes to a file ('test.txt') to show successful code execution. The repository includes a Maven configuration ('pom.xml') specifying the vulnerable dependency, a Python payload ('exp.py'), and a diagram ('CVE-2015-6420.drawio') illustrating the exploit chain. The exploit is operational and can be adapted for real-world attacks where the attacker can supply serialized data to a vulnerable Java application.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
5 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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.