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Public proof of conceptFix available

CVE-2025-8671

A public proof of concept exists; no exploitation attested.

  • Published2025-08-13
  • Fixed in0.6.0
  • WeaknessCWE-404

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2025-08-1313:15CVE publishedNVD

Versions per branch

OSV
pingora-core
BranchAffectedFixed in
0.x≥ 0.0.0-0, < 0.6.00.6.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA18 products

As certcc, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • SUSE Linux Enterprise Module for Development Tools
    Affected
    • ≥ 15 SP2, < 15-SP5fixed in 15-SP5custom
  • SUSE Linux Enterprise High Performance Computing (HPC)
    Affected
    • ≥ 15, < 15 SP5fixed in 15 SP5custom
  • Varnish Software Varnish Enterprise
    Affected
    • ≥ 6.0.x, ≤ 6.0.14r4no fix statedcustom
  • Varnish Software Varnish Cache
    Affected
    • ≥ 6.0LTS, ≤ 6.014no fix statedcustom
  • Varnish Software Varnish Cache
    Affected
    • ≥ 5.x, ≤ 7.71no fix statedcustom
  • Fastly H20
    Affected
    • = 579ecfano fix stated

12 more products in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2025-08-13

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • apache-nifiCleanStartall versions · fixed in 2.9.0-r3
  • apache-nifiCleanStartall versions · fixed in 2.9.0-r5
  • apache-nifiCleanStartall versions · fixed in 2.10.0-r1
  • apache-nifiCleanStartall versions · fixed in 2.6.0-r3
  • bunopenSUSE:Tumbleweedall versions · fixed in 1.4.4-1.1
  • cassandra-reaper-fipsCleanStartall versions · fixed in 4.2.5-r1
  • dnsdistUbuntu:Pro:24.04:LTSall versions · fixed in 1.8.3-2ubuntu0.1~esm1
  • dnsdistUbuntu:Pro:22.04:LTSall versions · fixed in 1.6.1-1ubuntu0.1~esm2

57 more package ranges on OSV.dev

Vendor advisories

Full record on NVD

Fix

  1. Update pingora-core to 0.6.0

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2025-08-13
Last Modified
2026-06-17
NVD status
Deferred
GitHub Advisory
GHSA-mrjm-qq9m-9mjq

Frequently asked questions

What is 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 (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.

Is CVE-2025-8671 actively exploited?

A proof-of-concept exploit exists for CVE-2025-8671, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2025-8671?

CVE-2025-8671 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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