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CVE-2016-6302 is an integer-underflow vulnerability in OpenSSL TLS session-ticket processing. In tls_decrypt_ticket(), OpenSSL validates only a minimum ticket length before subtracting the selected ticket HMAC length. When a server is configured to use SHA-512 for session-ticket HMACs, its 64-byte HMAC length can exceed the length of a crafted short ticket, underflowing the ticket-data length. The resulting value is converted to a large unsigned size and used in HMAC processing, causing an out-of-bounds read. The issue affects vulnerable OpenSSL 1.0.1 and 1.0.2 releases; it was fixed in OpenSSL 1.0.1u and 1.0.2i.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A low-severity OpenSSL denial-of-service vulnerability involving malformed SHA512 tickets, affecting OpenSSL 1.0.2 and 1.0.1.
OpenSSL denial-of-service flaw involving out-of-bounds read and crash when malformed TLS session tickets are processed with SHA512 HMAC.
OpenSSL TLS session-ticket HMAC length-validation flaw causing buffer over-read and server denial of service.
OpenSSL TLS session-ticket HMAC-length validation flaw causing buffer over-read and 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.