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CVE-2016-2181 is an improper input-validation flaw in OpenSSL DTLS replay protection. During DTLS handshake or renegotiation processing, records belonging to a future epoch could advance the replay-protection window before the record's MAC was validated. An attacker can send a future-epoch record with an extremely large sequence number; the record need not decrypt successfully or have a valid MAC. This advances the replay window beyond legitimate traffic, causing valid subsequent records on the affected DTLS connection to be treated as replays and discarded.
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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.
9 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 DTLS replay protection, affecting OpenSSL 1.0.2 and 1.0.1 DTLS users.
A denial-of-service vulnerability in OpenSSL related to DTLS replay protection, cited as a significant security issue found during the audit and already addressed.
OpenSSL DTLS denial-of-service flaw where replay protection state can be manipulated with invalid future-epoch records, causing legitimate packets to be dropped.
OpenSSL DTLS replay-protection flaw permitting denial of service against an established DTLS connection.
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.