Vulnerability in Fastly H20
CVE-2025-8671
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 (D…
EPSS: 0.046 (90.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Fastly H20 — versions 579ecfa
- Suse Linux Enterprise Desktop — versions 15 SP6
- Suse Linux Enterprise High Performance Computing — versions 15 SP3
- Suse Linux Enterprise High Performance Computing (Hpc) — versions 15
- Suse Linux Enterprise Module For Development Tools — versions 15 SP2
- Suse Linux Enterprise Module For Dev Tools — versions 15 SP3
- Suse Linux Enterprise Module For Package Hub — versions 15 SP5
- Suse Linux Enterprise Server — versions 12 SP5
- Suse Linux Enterprise Server For Sap Applications — versions 15 SP6
- Suse Linux Opensuse Leap — versions 15.6
Weakness classification (CWE)
Public proof-of-concept exploits
- moften/CVE-2025-8671-MadeYouReset-HTTP-2-DDoS
- ayushghatkar8080/MadeYouReset_Tester
- mateusm1403/PoC-CVE-2025-8671-MadeYouReset-HTTP-2
- mysara2022/CVE-2025-8671-vulnerability-POC-
- abiyeenzo/CVE-2025-8671
- fkie-cad/nvd-json-data-feeds
- nomi-sec/PoC-in-GitHub
- ekomsSavior/d0s_
- PuddinCat/GithubRepoSpider
- ARPSyndicate/cve-scores
References
Frequently asked questions
- What is CVE-2025-8671?
- CVE-2025-8671 is a high-severity vulnerability in Fastly H20, classified under Improper Resource Shutdown or Release. CVSS score: 7.5/10. Published 2025-08-13.
- How severe is CVE-2025-8671?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2025-8671 known to be exploited?
- 10 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.