CVE-2025-8671 Affecting lighttpd package, versions <0-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-ALPINE316-LIGHTTPD-12840757
- published17 Sept 2025
- disclosed13 Aug 2025
Introduced: 13 Aug 2025
CVE-2025-8671 (opens in a new tab)How to fix?
Upgrade Alpine:3.16 lighttpd to version 0-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream lighttpd package and not the lighttpd package as distributed by Alpine.
See How to fix? for Alpine:3.16 relevant fixed versions and status.
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.
References
- https://github.com/galbarnahum/MadeYouReset
- https://github.com/h2o/h2o/security/advisories/GHSA-mrjm-qq9m-9mjq
- https://github.com/jetty/jetty.project/pull/13449
- https://support2.windriver.com/index.php?page=security-notices
- https://galbarnahum.com/made-you-reset
- https://github.com/h2o/h2o/commit/4729b661e3c6654198d2cc62997e1af58bef4b80
- https://kb.cert.org/vuls/id/767506
- https://varnish-cache.org/security/VSV00017.html
- https://www.fastlystatus.com/incident/377810
- https://www.suse.com/support/kb/doc/?id=000021980
- https://deepness-lab.org/publications/madeyoureset/
- https://github.com/Kong/kong/discussions/14731
- https://github.com/envoyproxy/envoy/issues/40739
- https://github.com/varnish/hitch/issues/397
- https://www.imperva.com/blog/madeyoureset-turning-http-2-server-against-itself/
- https://gitlab.isc.org/isc-projects/bind9/-/issues/5325