CVE-2025-8671 (GCVE-0-2025-8671)

Vulnerability from cvelistv5 – Published: 2025-08-13 12:03 – Updated: 2025-11-04 21:15
VLAI
Title
CVE-2025-8671
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
SUSE Linux Enterprise Module for Development Tools Affected: 15 SP2 , < 15-SP5 (custom)
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SUSE Linux Enterprise High Performance Computing (HPC) Affected: 15 , < 15 SP5 (custom)
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Varnish Software Varnish Enterprise Affected: 6.0.x , ≤ 6.0.14r4 (custom)
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Varnish Software Varnish Cache Affected: 6.0LTS , ≤ 6.014 (custom)
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Varnish Software Varnish Cache Affected: 5.x , ≤ 7.71 (custom)
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Fastly H20 Affected: 579ecfa
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Wind River Linux Affected: LTS22 , ≤ TLS25 (custom)
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SUSE Linux Enterprise Desktop Affected: 15 SP6 , < 15 SP7 (custom)
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SUSE Linux Enterprise High Performance Computing Affected: 15 SP3 , < 15 SP7 (custom)
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SUSE Linux Enterprise Module for Dev Tools Affected: 15 SP3 , < 15 SP7 (custom)
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SUSE Linux Enterprise Module for Package Hub Affected: 15 SP5 , < 15 SP7 (custom)
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SUSE Linux Enterprise Server Affected: 12 SP5 , < 15 SP7 (custom)
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SUSE Linux Enterprise Server for SAP Applications Affected: 15 SP6 , < 15 SP7 (custom)
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SUSE Linux SUSE Manager Server Affected: 4.3
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SUSE Linux SUSE Manager Server LTS Affected: 4.3
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SUSE Linux SUSE Manager Proxy Affected: 4.3
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SUSE Linux SUSE Manager Retail Branch Server Affected: 4.3
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SUSE Linux openSUSE Leap Affected: 15.6
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\"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-8671\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-08-13T18:34:19.913332Z\"}}}], \"references\": [{\"url\": \"https://gitlab.isc.org/isc-projects/bind9/-/issues/5325\", \"tags\": [\"exploit\"]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-404\", \"description\": \"CWE-404 Improper Resource Shutdown or Release\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-08-13T18:00:28.478Z\"}}], \"cna\": {\"title\": \"CVE-2025-8671\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"affected\": [{\"vendor\": \"SUSE Linux\", \"product\": \"Enterprise Module for Development Tools\", \"versions\": [{\"status\": \"affected\", \"version\": \"15 SP2\", \"lessThan\": \"15-SP5\", \"versionType\": \"custom\"}]}, {\"vendor\": \"SUSE Linux\", \"product\": \"Enterprise High Performance Computing (HPC)\", \"versions\": [{\"status\": \"affected\", \"version\": \"15\", \"lessThan\": \"15 SP5\", \"versionType\": \"custom\"}]}, {\"vendor\": \"Varnish Software\", \"product\": \"Varnish Enterprise\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.0.x\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"6.0.14r4\"}]}, {\"vendor\": \"Varnish Software\", \"product\": \"Varnish Cache\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.0LTS\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"6.014\"}]}, {\"vendor\": \"Varnish Software\", 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Proxy\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.3\"}]}, {\"vendor\": \"SUSE Linux\", \"product\": \"SUSE Manager Retail Branch Server\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.3\"}]}, {\"vendor\": \"SUSE Linux\", \"product\": \"openSUSE Leap\", \"versions\": [{\"status\": \"affected\", \"version\": \"15.6\"}]}], \"references\": [{\"url\": \"https://galbarnahum.com/made-you-reset\"}, {\"url\": \"https://kb.cert.org/vuls/id/767506\"}, {\"url\": \"https://varnish-cache.org/security/VSV00017.html\"}, {\"url\": \"https://www.fastlystatus.com/incident/377810\"}, {\"url\": \"https://github.com/h2o/h2o/commit/4729b661e3c6654198d2cc62997e1af58bef4b80\"}, {\"url\": \"https://support2.windriver.com/index.php?page=security-notices\"}, {\"url\": \"https://www.suse.com/support/kb/doc/?id=000021980\"}, {\"url\": \"https://gitlab.isc.org/isc-projects/bind9/-/issues/5325\"}, {\"url\": \"https://github.com/h2o/h2o/security/advisories/GHSA-mrjm-qq9m-9mjq\"}], \"x_generator\": {\"env\": \"prod\", \"engine\": \"VINCE 3.0.22\", \"origin\": \"https://cveawg.mitre.org/api/cve/CVE-2025-8671\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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\\u2014using malformed frames or flow control errors\\u2014an 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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-404 Improper Resource Shutdown or Release\"}]}], \"providerMetadata\": {\"orgId\": \"37e5125f-f79b-445b-8fad-9564f167944b\", \"shortName\": \"certcc\", \"dateUpdated\": \"2025-08-13T18:19:45.844Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-8671\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-04T21:15:08.215Z\", \"dateReserved\": \"2025-08-06T11:52:46.667Z\", \"assignerOrgId\": \"37e5125f-f79b-445b-8fad-9564f167944b\", \"datePublished\": \"2025-08-13T12:03:37.167Z\", \"assignerShortName\": \"certcc\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.