CVE-2025-8671CVE-2025-8671
- 7.5HighCVSS base score
- 3.6%Exploitation in 30 daysEPSS · top 10% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- YesPublic exploitsa reference or SSVC says so
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.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. A reference of the record is tagged as an exploit. CISA's SSVC rates its exploitation: a proof of concept is public.
Show the exploits1
References tagged exploit1 reference
Timeline
ID reserved
By certcc
- 7 days later
· 7 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Deferred | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 3.6% · top 10% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
SUSE Linux · Enterprise Module for Development Tools
- affected 15 SP2 – < 15-SP5
SUSE Linux · Enterprise High Performance Computing (HPC)
- affected 15 – < 15 SP5
Varnish Software · Varnish Enterprise
- affected 6.0.x – ≤ 6.0.14r4
Varnish Software · Varnish Cache
- affected 6.0LTS – ≤ 6.014
Varnish Software · Varnish Cache
- affected 5.x – ≤ 7.71
- affected 579ecfa
- affected LTS22 – ≤ TLS25
SUSE Linux · Enterprise Desktop
- affected 15 SP6 – < 15 SP7
SUSE Linux · Enterprise High Performance Computing
- affected 15 SP3 – < 15 SP7
SUSE Linux · Enterprise Module for Dev Tools
- affected 15 SP3 – < 15 SP7
SUSE Linux · Enterprise Module for Package Hub
- affected 15 SP5 – < 15 SP7
SUSE Linux · Enterprise Server
- affected 12 SP5 – < 15 SP7
SUSE Linux · Enterprise Server for SAP Applications
- affected 15 SP6 – < 15 SP7
SUSE Linux · SUSE Manager Server
- affected 4.3
SUSE Linux · SUSE Manager Server LTS
- affected 4.3
SUSE Linux · SUSE Manager Proxy
- affected 4.3
SUSE Linux · SUSE Manager Retail Branch Server
- affected 4.3
- affected 15.6
References
References17
- https://galbarnahum.com/made-you-reset (opens in a new tab)
- https://kb.cert.org/vuls/id/767506 (opens in a new tab)
- https://varnish-cache.org/security/VSV00017.html (opens in a new tab)
- https://www.fastlystatus.com/incident/377810 (opens in a new tab)
- https://github.com/h2o/h2o/commit/4729b661e3c6654198d2cc62997e1af58bef4b80 (opens in a new tab)
- https://support2.windriver.com/index.php?page=security-notices (opens in a new tab)
- https://www.suse.com/support/kb/doc/?id=000021980 (opens in a new tab)
- https://gitlab.isc.org/isc-projects/bind9/-/issues/5325 (opens in a new tab)exploit
- https://github.com/h2o/h2o/security/advisories/GHSA-mrjm-qq9m-9mjq (opens in a new tab)
- https://github.com/envoyproxy/envoy/issues/40739 (opens in a new tab)
- https://github.com/varnish/hitch/issues/397 (opens in a new tab)
- https://github.com/Kong/kong/discussions/14731 (opens in a new tab)
- https://deepness-lab.org/publications/madeyoureset/ (opens in a new tab)
- https://www.imperva.com/blog/madeyoureset-turning-http-2-server-against-itself/ (opens in a new tab)
- https://www.kb.cert.org/vuls/id/767506 (opens in a new tab)
- http://www.openwall.com/lists/oss-security/2025/09/18/1 (opens in a new tab)
- http://www.openwall.com/lists/oss-security/2025/08/13/6 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-24560 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-8671)Record last updated .