ubuntu-cve-2025-11677
Vulnerability from osv_ubuntu
Published
2025-10-20 14:15
Modified
2026-04-22 07:53
Summary
Details
Use After Free in WebSocket server implementation in lws_handshake_server in warmcat libwebsockets may allow an attacker, in specific configurations where the user provides a callback function that handles LWS_CALLBACK_HTTP_CONFIRM_UPGRADE, to achieve denial of service.
Severity
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libwebsockets-test-server",
"binary_version": "3.2.1-3ubuntu0.1~esm1"
},
{
"binary_name": "libwebsockets-test-server-common",
"binary_version": "3.2.1-3ubuntu0.1~esm1"
},
{
"binary_name": "libwebsockets15",
"binary_version": "3.2.1-3ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "libwebsockets",
"purl": "pkg:deb/ubuntu/libwebsockets@3.2.1-3ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.2.1-3ubuntu0.1~esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.3-3build1",
"3.2.1-3"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libwebsockets-test-server",
"binary_version": "4.0.20-2ubuntu1.1"
},
{
"binary_name": "libwebsockets-test-server-common",
"binary_version": "4.0.20-2ubuntu1.1"
},
{
"binary_name": "libwebsockets16",
"binary_version": "4.0.20-2ubuntu1.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "libwebsockets",
"purl": "pkg:deb/ubuntu/libwebsockets@4.0.20-2ubuntu1.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.0.20-2ubuntu1.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.0.20-2",
"4.0.20-2ubuntu1"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libwebsockets-evlib-ev",
"binary_version": "4.3.3-1.1ubuntu0.1~esm1"
},
{
"binary_name": "libwebsockets-evlib-glib",
"binary_version": "4.3.3-1.1ubuntu0.1~esm1"
},
{
"binary_name": "libwebsockets-evlib-uv",
"binary_version": "4.3.3-1.1ubuntu0.1~esm1"
},
{
"binary_name": "libwebsockets-test-server",
"binary_version": "4.3.3-1.1ubuntu0.1~esm1"
},
{
"binary_name": "libwebsockets-test-server-common",
"binary_version": "4.3.3-1.1ubuntu0.1~esm1"
},
{
"binary_name": "libwebsockets19t64",
"binary_version": "4.3.3-1.1ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:24.04:LTS",
"name": "libwebsockets",
"purl": "pkg:deb/ubuntu/libwebsockets@4.3.3-1.1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.3.3-1.1ubuntu0.1~esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.3.2-4",
"4.3.3-1",
"4.3.3-1.1build1",
"4.3.3-1.1build2",
"4.3.3-1.1build3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libwebsockets-evlib-ev",
"binary_version": "4.3.5-1"
},
{
"binary_name": "libwebsockets-evlib-glib",
"binary_version": "4.3.5-1"
},
{
"binary_name": "libwebsockets-evlib-uv",
"binary_version": "4.3.5-1"
},
{
"binary_name": "libwebsockets-test-server",
"binary_version": "4.3.5-1"
},
{
"binary_name": "libwebsockets-test-server-common",
"binary_version": "4.3.5-1"
},
{
"binary_name": "libwebsockets19t64",
"binary_version": "4.3.5-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "libwebsockets",
"purl": "pkg:deb/ubuntu/libwebsockets@4.3.5-1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.3.5-1"
]
}
],
"aliases": [],
"details": "Use After Free in WebSocket server implementation in lws_handshake_server in warmcat libwebsockets may allow an attacker, in specific configurations where the user provides a callback function that handles\u00a0LWS_CALLBACK_HTTP_CONFIRM_UPGRADE, to achieve denial of service.",
"id": "UBUNTU-CVE-2025-11677",
"modified": "2026-04-22T07:53:20Z",
"published": "2025-10-20T14:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2025-11677"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-11677"
},
{
"type": "REPORT",
"url": "https://libwebsockets.org/git/libwebsockets/commit?id=2f082ec31261f556969160143ba94875d783971a"
},
{
"type": "REPORT",
"url": "https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2025-11677"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8024-1"
}
],
"related": [
"USN-8024-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2025-11677"
]
}
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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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