USN-8024-1 (UBUNTU-CVE-2025-11677)
Vulnerability from osv_ubuntu – Published: 2026-02-11 12:58 – Updated: 2026-04-27 14:11 – Source website
VLAI
Summary
libwebsockets vulnerabilities
Details
Raffaele Bova discovered that Libwebsockets incorrectly handled memory when the upgrade header is not valid in the WebSocket server. An attacker could possibly use this issue to cause a denial of service. (CVE-2025-11677)
Raffaele Bova discovered that Libwebsockets did not properly check the size of the destination buffer in the async-dns component. An attacker could possibly use this issue to cause applications to crash, leading to a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2025-11678)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2025-11677",
"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"
}
]
}
],
"ecosystem": "Ubuntu:Pro:20.04:LTS"
}
},
"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"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2025-11677",
"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"
}
]
},
{
"id": "CVE-2025-11678",
"severity": [
{
"score": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"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"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2025-11677",
"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"
}
]
},
{
"id": "CVE-2025-11678",
"severity": [
{
"score": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:24.04:LTS"
}
},
"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"
]
}
],
"aliases": [],
"details": "Raffaele Bova discovered that Libwebsockets incorrectly handled memory\nwhen the upgrade header is not valid in the WebSocket server. An\nattacker could possibly use this issue to cause a denial of service.\n(CVE-2025-11677)\n\nRaffaele Bova discovered that Libwebsockets did not properly check the\nsize of the destination buffer in the async-dns component. An attacker\ncould possibly use this issue to cause applications to crash, leading to a\ndenial of service, or possibly execute arbitrary code. This issue only\naffected Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2025-11678)",
"id": "USN-8024-1",
"modified": "2026-04-27T14:11:47Z",
"published": "2026-02-11T12:58:26Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8024-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2025-11677"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2025-11678"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "libwebsockets vulnerabilities",
"upstream": [
"UBUNTU-CVE-2025-11677",
"UBUNTU-CVE-2025-11678"
]
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
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They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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