CVE-2025-8671
CVE-2025-8671
Description
A mismatch caused by client-triggered server-sent stream resets between HTTP/2 specifications and the internal architectures of some HTTP/2 implementations may result in excessive server resource consumption leading to denial-of-service (DoS). By opening streams and then rapidly triggering the server to reset them—using malformed frames or flow control errors—an attacker can exploit incorrect stream accounting. Streams reset by the server are considered closed at the protocol level, even though backend processing continues. This allows a client to cause the server to handle an unbounded number of concurrent streams on a single connection. This CVE will be updated as affected product details are released.
INFO
Published Date :
Aug. 13, 2025, 1:15 p.m.
Last Modified :
Aug. 17, 2025, 3:15 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Ensure HTTP/2 implementations correctly account for reset streams.
- Update HTTP/2 software to the latest secure versions.
- Apply vendor patches when they become available.
Public PoC/Exploit Available at Github
CVE-2025-8671 has a 5 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-8671.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-8671 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-8671
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
PoC éducatif pour la vulnérabilité CVE-2025-8671 (DoS HTTP/2 sur lighttpd). À utiliser uniquement en laboratoire local.
Python
PoC para validar vulnerabilidade MadeYouReset
Python
c0me 0n d0wn t0 d0s t0wn
Python
CVE-2025-25063 MadeYouReset HTTP/2 DDoS
ddos exploit madeyoureset
Python
📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.
security cve exploit poc vulnerability
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-8671 vulnerability anywhere in the article.
-
The Cyber Express
New HTTP/2 DoS Vulnerability Prompts Vendor and Project Fixes
A new HTTP/2 denial of service (DoS) vulnerability that circumvents mitigations put in place after 2023’s “Rapid Reset” vulnerability is largely being addressed by affected vendors and projects, thank ... Read more
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SentinelOne
The Good, the Bad and the Ugly in Cybersecurity – Week 33
The Good | DoJ Charges $100M Fraud Ring & Seizes $1M in Crypto from BlackSuit Ransomware The DoJ has charged four Ghanaian nationals, Isaac Oduro Boateng (aka “Kofi Boat”), Inusah Ahmed (aka “Pascal”) ... Read more
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SentinelOne
The Good, the Bad and the Ugly in Cybersecurity – Week 33
The Good | DoJ Charges $100M Fraud Ring & Seizes $1M in Crypto from BlackSuit Ransomware The DoJ has charged four Ghanaian nationals, Isaac Oduro Boateng (aka “Kofi Boat”), Inusah Ahmed (aka “Pascal”) ... Read more
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CybersecurityNews
New HTTP/2 MadeYouReset Vulnerability Enables Large-Scale DDoS Attacks
Security researchers have identified a new denial-of-service (DoS) vulnerability in HTTP/2 implementations, referred to as MadeYouReset (CVE-2025-8671). This discovery represents a notable escalation ... Read more
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Daily CyberSecurity
Patch Now: Apache Tomcat Fixes Session Fixation and ‘MadeYouReset’ Flaws
The Apache Tomcat Project has issued important updates addressing two significant vulnerabilities affecting multiple supported versions of the popular open-source application server. The flaws — CVE-2 ... Read more
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Daily CyberSecurity
MadeYouReset: New HTTP/2 Flaw Threatens to Cripple Servers with DDoS Attacks
CERT/CC has issued a vulnerability note warning about a newly discovered flaw in multiple HTTP/2 implementations that could allow threat actors to launch highly effective denial-of-service (DoS) or di ... Read more
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The Cloudflare Blog
MadeYouReset: An HTTP/2 vulnerability thwarted by Rapid Reset mitigations
2025-08-142 min readOn August 13, security researchers at Tel Aviv University disclosed a new HTTP/2 denial-of-service (DoS) vulnerability that they are calling MadeYouReset (CVE-2025-8671). This vuln ... Read more
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The Register
'MadeYouReset' HTTP/2 flaw lets attackers DoS servers
Security researchers Gal Bar Nahum, Anat Bremler-Barr, and Yaniv Harel have published details of a "common design flaw" in implementations of the HyperText Transfer Protocol 2 (HTTP/2) allowing those ... Read more
-
The Hacker News
New HTTP/2 'MadeYouReset' Vulnerability Enables Large-Scale DoS Attacks
Aug 14, 2025Ravie LakshmananServer Security / Vulnerability Multiple HTTP/2 implementations have been found susceptible to a new attack technique called MadeYouReset that could be explored to conduc ... Read more
The following table lists the changes that have been made to the
CVE-2025-8671 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Aug. 17, 2025
Action Type Old Value New Value Added Reference https://deepness-lab.org/publications/madeyoureset/ Added Reference https://github.com/envoyproxy/envoy/issues/40739 Added Reference https://github.com/Kong/kong/discussions/14731 Added Reference https://github.com/varnish/hitch/issues/397 Added Reference https://www.imperva.com/blog/madeyoureset-turning-http-2-server-against-itself/ -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 13, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-404 Added Reference https://gitlab.isc.org/isc-projects/bind9/-/issues/5325 -
CVE Modified by [email protected]
Aug. 13, 2025
Action Type Old Value New Value Removed Reference https://github.com/jetty/jetty.project/pull/13449 -
CVE Modified by [email protected]
Aug. 13, 2025
Action Type Old Value New Value Added Reference https://galbarnahum.com/made-you-reset Added Reference https://github.com/h2o/h2o/commit/4729b661e3c6654198d2cc62997e1af58bef4b80 Added Reference https://gitlab.isc.org/isc-projects/bind9/-/issues/5325 Added Reference https://kb.cert.org/vuls/id/767506 Added Reference https://varnish-cache.org/security/VSV00017.html Added Reference https://www.fastlystatus.com/incident/377810 Added Reference https://www.suse.com/support/kb/doc/?id=000021980 Removed Reference https://github.com/galbarnahum/MadeYouReset -
New CVE Received by [email protected]
Aug. 13, 2025
Action Type Old Value New Value Added Description A mismatch caused by client-triggered server-sent stream resets between HTTP/2 specifications and the internal architectures of some HTTP/2 implementations may result in excessive server resource consumption leading to denial-of-service (DoS). By opening streams and then rapidly triggering the server to reset them—using malformed frames or flow control errors—an attacker can exploit incorrect stream accounting. Streams reset by the server are considered closed at the protocol level, even though backend processing continues. This allows a client to cause the server to handle an unbounded number of concurrent streams on a single connection. This CVE will be updated as affected product details are released. Added Reference https://github.com/galbarnahum/MadeYouReset Added Reference https://github.com/h2o/h2o/security/advisories/GHSA-mrjm-qq9m-9mjq Added Reference https://github.com/jetty/jetty.project/pull/13449 Added Reference https://support2.windriver.com/index.php?page=security-notices