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NVD / CVE Program· CNA certcc

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

Noroxi assessment

Priority: Monitor (action score 31/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 3.6% (FIRST EPSS); higher than 89.4% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: lighttpd (Alpine:v3.15) 0-r0; varnish (Alpine:v3.22) 7.7.2-r0; pingora-core (crates.io) 0.6.0.

Low priority for now. Upgrade to lighttpd (Alpine:v3.15) 0-r0; varnish (Alpine:v3.22) 7.7.2-r0; pingora-core (crates.io) 0.6.0 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.5 · v3.1—Proof of concept Fix available
Published
Aug 13, 2025
Updated
Jun 17, 2026
EPSS
3.6% · 89th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 3.6%

CISA SSVC decision

Exploitation
proof of concept
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2025-8671

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (certcc). Independent of NVD's CPE analysis and usually ahead of it.

  • Fastly H20

    • 579ecfaaffected

  • SUSE Linux Enterprise Desktop

    • 15 SP6 and later · before 15 SP7affected

  • SUSE Linux Enterprise High Performance Computing

    • 15 SP3 and later · before 15 SP7affected

  • SUSE Linux Enterprise High Performance Computing (HPC)

    • 15 and later · before 15 SP5affected

  • SUSE Linux Enterprise Module for Dev Tools

    • 15 SP3 and later · before 15 SP7affected

  • SUSE Linux Enterprise Module for Development Tools

    • 15 SP2 and later · before 15-SP5affected

  • SUSE Linux Enterprise Module for Package Hub

    • 15 SP5 and later · before 15 SP7affected

  • SUSE Linux Enterprise Server

    • 12 SP5 and later · before 15 SP7affected

  • SUSE Linux Enterprise Server for SAP Applications

    • 15 SP6 and later · before 15 SP7affected

  • SUSE Linux openSUSE Leap

    • 15.6affected

  • SUSE Linux SUSE Manager Proxy

    • 4.3affected

  • SUSE Linux SUSE Manager Retail Branch Server

    • 4.3affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.15lighttpdbefore 0-r00-r0
Alpine:v3.22varnishbefore 7.7.2-r07.7.2-r0
crates.iopingora-corefrom 0.0.0-0 · before 0.6.00.6.0
Debian:12h2ofrom 0—
Debian:12varnishfrom 0—
Debian:13varnishbefore 7.7.0-3+deb13u17.7.0-3+deb13u1
openSUSE:Leap 16.0dnsdistbefore 1.9.11-160000.1.11.9.11-160000.1.1
openSUSE:Leap 16.0varnishbefore 7.7.3-bp160.1.17.7.3-bp160.1.1
openSUSE:Tumbleweeddnsdistbefore 2.0.2-1.12.0.2-1.1
openSUSE:Tumbleweedlighttpdbefore 1.4.80-1.11.4.80-1.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7dnsdistbefore 1.9.11-150700.3.6.11.9.11-150700.3.6.1
SUSE:Linux Enterprise Server 16.0dnsdistbefore 1.9.11-160000.1.11.9.11-160000.1.1

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:lighttpd0-r0 · Alpine:v3.15Package registry (OSV)
alpine:varnish7.7.2-r0 · Alpine:v3.22Package registry (OSV)
crates.io:pingora-core0.6.0Package registry (OSV)
debian:varnish7.7.0-3+deb13u1 · Debian:13Package registry (OSV)
opensuse:dnsdist2.0.2-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:lighttpd1.4.80-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:varnish7.7.3-bp160.1.1 · openSUSE:Leap 16.0Package registry (OSV)
suse:dnsdist1.9.11-150700.3.6.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×5

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:62025-08-18
Proof-of-concept repository on GitHubstars:22025-08-21
Proof-of-concept repository on GitHubstars:02025-08-23
Proof-of-concept repository on GitHubstars:02026-02-09
Proof-of-concept repository on GitHubstars:42026-06-01

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoC+5 d
  3. TodayOct 26, 2026+439 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-404 · Improper Resource Shutdown or Release

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (16 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records