ubuntu-cve-2025-8671
Vulnerability from osv_ubuntu
Published
2025-08-13 13:15
Modified
2026-05-20 15:15
Summary
Details
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)
N/A (UNKNOWN)
References
{
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"binary_version": "1.4.74-1ubuntu3"
},
{
"binary_name": "lighttpd-modules-ldap",
"binary_version": "1.4.74-1ubuntu3"
},
{
"binary_name": "lighttpd-modules-lua",
"binary_version": "1.4.74-1ubuntu3"
},
{
"binary_name": "lighttpd-modules-mysql",
"binary_version": "1.4.74-1ubuntu3"
}
]
},
"package": {
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"name": "lighttpd",
"purl": "pkg:deb/ubuntu/lighttpd@1.4.74-1ubuntu3?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.69-1ubuntu1",
"1.4.69-1ubuntu2",
"1.4.73-1ubuntu1",
"1.4.73-1ubuntu2",
"1.4.74-1ubuntu2",
"1.4.74-1ubuntu3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
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"binary_version": "7.1.1-1.1ubuntu1"
},
{
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}
]
},
"package": {
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},
"ranges": [
{
"events": [
{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"7.1.1-1.1ubuntu1"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "dnsdist",
"binary_version": "1.8.3-2ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:24.04:LTS",
"name": "dnsdist",
"purl": "pkg:deb/ubuntu/dnsdist@1.8.3-2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/noble"
},
"ranges": [
{
"events": [
{
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},
{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.8.0-1",
"1.8.2-1",
"1.8.2-2",
"1.8.2-3",
"1.8.3-1",
"1.8.3-2",
"1.8.3-2build1",
"1.8.3-2build2"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "dnsdist",
"binary_version": "1.9.10-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "dnsdist",
"purl": "pkg:deb/ubuntu/dnsdist@1.9.10-1ubuntu0.1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.9.10-1ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.9.8-1",
"1.9.10-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "lighttpd",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-authn-gssapi",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-authn-pam",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-authn-sasl",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-deflate",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-gnutls",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-maxminddb",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-mbedtls",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-nss",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-openssl",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-vhostdb-pgsql",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-webdav",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-wolfssl",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-modules-dbi",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-modules-ldap",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-modules-lua",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-modules-mysql",
"binary_version": "1.4.82-2ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "lighttpd",
"purl": "pkg:deb/ubuntu/lighttpd@1.4.82-2ubuntu1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.79-1ubuntu1",
"1.4.79-2ubuntu1",
"1.4.82-2ubuntu1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libvarnishapi3",
"binary_version": "7.7.3-1"
},
{
"binary_name": "varnish",
"binary_version": "7.7.3-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "varnish",
"purl": "pkg:deb/ubuntu/varnish@7.7.3-1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"7.7.0-1",
"7.7.0-2",
"7.7.0-3",
"7.7.3-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "lighttpd",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-authn-gssapi",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-authn-pam",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-authn-sasl",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-deflate",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-gnutls",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-maxminddb",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-mbedtls",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-nss",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-openssl",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-vhostdb-pgsql",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-webdav",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-wolfssl",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-modules-dbi",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-modules-ldap",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-modules-lua",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-modules-mysql",
"binary_version": "1.4.82-2ubuntu2"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "lighttpd",
"purl": "pkg:deb/ubuntu/lighttpd@1.4.82-2ubuntu2?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.82-2ubuntu1",
"1.4.82-2ubuntu2"
]
}
],
"aliases": [],
"details": "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.",
"id": "UBUNTU-CVE-2025-8671",
"modified": "2026-05-20T15:15:59Z",
"published": "2025-08-13T13:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2025-8671"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-8671"
},
{
"type": "REPORT",
"url": "https://kb.cert.org/vuls/id/767506"
},
{
"type": "REPORT",
"url": "https://galbarnahum.com/made-you-reset"
},
{
"type": "REPORT",
"url": "https://github.com/h2o/h2o/commit/4729b661e3c6654198d2cc62997e1af58bef4b80"
},
{
"type": "REPORT",
"url": "https://github.com/h2o/h2o/security/advisories/GHSA-mrjm-qq9m-9mjq"
},
{
"type": "REPORT",
"url": "https://gitlab.isc.org/isc-projects/bind9/-/issues/5325"
},
{
"type": "REPORT",
"url": "https://support2.windriver.com/index.php?page=security-notices"
},
{
"type": "REPORT",
"url": "https://varnish-cache.org/security/VSV00017.html"
},
{
"type": "REPORT",
"url": "https://www.fastlystatus.com/incident/377810"
},
{
"type": "REPORT",
"url": "https://www.suse.com/support/kb/doc/?id=000021980"
},
{
"type": "REPORT",
"url": "https://www.openwall.com/lists/oss-security/2025/09/18/1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8037-1"
}
],
"related": [
"USN-8037-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2025-8671"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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