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CVE-2016-6306 is a low-severity out-of-bounds read vulnerability in OpenSSL certificate-message parsing during TLS/SSL handshakes. Missing message-length validation when processing client certificate, client certificate request, or server certificate messages can cause reads of up to two bytes past an allocated buffer. It affects OpenSSL 1.0.1 releases before 1.0.1u and OpenSSL 1.0.2 releases before 1.0.2i; OpenSSL 1.1.0 is not affected.
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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.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A low-severity OpenSSL vulnerability involving out-of-bounds reads in certificate message processing, affecting OpenSSL 1.0.2 and 1.0.1.
OpenSSL out-of-bounds read due to missing message length checks, with theoretical denial-of-service impact in client-authentication scenarios.
OpenSSL TLS/SSL handshake-message out-of-bounds reads causing client or server denial of service.
OpenSSL TLS/SSL handshake-message out-of-bounds read flaws causing denial of service.
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.