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MadeYouReset is an HTTP/2 denial-of-service vulnerability caused by a mismatch between HTTP/2 stream-reset semantics and stream accounting in affected implementations. An unauthenticated client can open streams and induce server-side resets, including through malformed frames or flow-control errors. Although such streams are protocol-level closed after the server sends a reset, backend processing associated with them may continue. Implementations that no longer count these reset streams toward concurrency limits can consequently be induced to process an unbounded number of concurrent backend requests over one HTTP/2 connection.
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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.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (4 hidden).
This repository provides a Python proof-of-concept (PoC) exploit for CVE-2025-8671, a denial-of-service (DoS) vulnerability in the lighttpd web server's HTTP/2 implementation (versions prior to 1.4.80). The repository contains three files: a README.md with detailed usage instructions and warnings, a requirements.txt listing dependencies ('rich' for console output and 'h2' for HTTP/2 protocol support), and the main exploit script (main.py). The script allows users to check if a target server is running a vulnerable version of lighttpd and, if so, to launch a DoS attack by sending repeated HTTP/2 streams with immediate resets. The attack is configurable (number of streams, continuous mode) and is intended strictly for local/lab use, as emphasized in the documentation. The exploit targets network-accessible lighttpd servers and does not contain any hardcoded IPs or domains; the user specifies the target host and port. The code is a functional PoC and does not include weaponized or framework-level features.
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.
42 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A specific vulnerability affecting Vinyl Cache, addressed by Gentoo's upgrade to Vinyl Cache 8.0.2 or later.
An HTTP/2 protocol-level denial-of-service technique/vulnerability that abuses server-triggered stream resets to bypass common per-connection request limits and Rapid Reset mitigations, enabling large-scale request floods and potential out-of-memory crashes.
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.