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CVE-2025-9784 is a denial-of-service vulnerability in Undertow's HTTP/2 request handling. Malformed client requests can trigger server-side stream resets or aborts without incrementing the implementation's abuse counters, creating an accounting gap that allows repeated reset-driven processing to evade intended protections. This implementation weakness, referred to as the "MadeYouReset" attack, enables an attacker to repeatedly induce expensive server-side work on a single or limited number of connections, resulting in resource exhaustion and service degradation. The issue is described as an implementation flaw rather than a defect in the HTTP/2 protocol itself.
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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 valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
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.