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CVE-2024-1300 is a memory-leak vulnerability in Eclipse Vert.x Core TCP servers configured for TLS with Server Name Indication (SNI). When a client supplies an SNI hostname that has no mapped certificate and is therefore served using the default certificate, Vert.x incorrectly caches the associated SSL context in its server-name map. Repeated handshakes using distinct arbitrary unrecognized server names cause the cache to grow without being released, exhausting JVM heap memory.
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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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A memory-leak vulnerability in io.vertx:vertx-core when a TCP server is configured for TLS with Server Name Indication (SNI).
A Vert.x Core memory leak occurring when a TCP server is configured with TLS and SNI support.
A memory-leak vulnerability in Vert.x core when a TCP server is configured with TLS and SNI support.
A memory-leak vulnerability in Vert.x Core affecting TCP servers configured with TLS and Server Name Indication (SNI) support.
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.