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CVE-2016-2109 is an improper-input-validation vulnerability in OpenSSL's ASN.1 BIO decoding implementation, specifically asn1_d2i_read_bio. When ASN.1 data is decoded from a BIO by d2i BIO functions such as d2i_CMS_bio(), a short malformed ASN.1 encoding can cause OpenSSL to request excessively large memory allocations. The issue affects OpenSSL releases before 1.0.1t and 1.0.2 releases before 1.0.2h. Memory-based ASN.1 decoding functions, including d2i_X509(), are 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.
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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.
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
OpenSSL denial-of-service vulnerability where malformed ASN.1 data read from BIO can trigger excessive memory allocation.
An OpenSSL flaw fixed by the Red Hat JBoss Core Services httpd 2.4.23 update.
An OpenSSL flaw fixed by the Red Hat JBoss Core Services httpd 2.4.23 update.
An OpenSSL ASN.1 BIO parsing denial-of-service vulnerability that allows excessive memory allocation when an application processes untrusted ASN.1-encoded BIO input.
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.