ubuntu-cve-2025-53506
Vulnerability from osv_ubuntu
Published
2025-07-10 20:15
Modified
2026-07-29 23:13
Summary
Details
Uncontrolled Resource Consumption vulnerability in Apache Tomcat if an HTTP/2 client did not acknowledge the initial settings frame that reduces the maximum permitted concurrent streams. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.8, from 10.1.0-M1 through 10.1.42, from 9.0.0.M1 through 9.0.106. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 through 8.5.100. Other EOL versions may also be affected. Users are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.
Severity
7.5 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libtomcat8-embed-java",
"binary_version": "8.5.39-1ubuntu1~18.04.3+esm6"
},
{
"binary_name": "libtomcat8-java",
"binary_version": "8.5.39-1ubuntu1~18.04.3+esm6"
},
{
"binary_name": "tomcat8",
"binary_version": "8.5.39-1ubuntu1~18.04.3+esm6"
},
{
"binary_name": "tomcat8-admin",
"binary_version": "8.5.39-1ubuntu1~18.04.3+esm6"
},
{
"binary_name": "tomcat8-common",
"binary_version": "8.5.39-1ubuntu1~18.04.3+esm6"
},
{
"binary_name": "tomcat8-docs",
"binary_version": "8.5.39-1ubuntu1~18.04.3+esm6"
},
{
"binary_name": "tomcat8-examples",
"binary_version": "8.5.39-1ubuntu1~18.04.3+esm6"
},
{
"binary_name": "tomcat8-user",
"binary_version": "8.5.39-1ubuntu1~18.04.3+esm6"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "tomcat8",
"purl": "pkg:deb/ubuntu/tomcat8@8.5.39-1ubuntu1~18.04.3+esm6?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"8.5.21-1ubuntu1",
"8.5.29-1",
"8.5.30-1",
"8.5.30-1ubuntu1",
"8.5.30-1ubuntu1.2",
"8.5.30-1ubuntu1.3",
"8.5.30-1ubuntu1.4",
"8.5.39-1ubuntu1~18.04.1",
"8.5.39-1ubuntu1~18.04.2",
"8.5.39-1ubuntu1~18.04.3",
"8.5.39-1ubuntu1~18.04.3+esm1",
"8.5.39-1ubuntu1~18.04.3+esm2",
"8.5.39-1ubuntu1~18.04.3+esm3",
"8.5.39-1ubuntu1~18.04.3+esm4",
"8.5.39-1ubuntu1~18.04.3+esm5",
"8.5.39-1ubuntu1~18.04.3+esm6"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libtomcat9-embed-java",
"binary_version": "9.0.16-3ubuntu0.18.04.2+esm8"
},
{
"binary_name": "libtomcat9-java",
"binary_version": "9.0.16-3ubuntu0.18.04.2+esm8"
},
{
"binary_name": "tomcat9",
"binary_version": "9.0.16-3ubuntu0.18.04.2+esm8"
},
{
"binary_name": "tomcat9-admin",
"binary_version": "9.0.16-3ubuntu0.18.04.2+esm8"
},
{
"binary_name": "tomcat9-common",
"binary_version": "9.0.16-3ubuntu0.18.04.2+esm8"
},
{
"binary_name": "tomcat9-docs",
"binary_version": "9.0.16-3ubuntu0.18.04.2+esm8"
},
{
"binary_name": "tomcat9-examples",
"binary_version": "9.0.16-3ubuntu0.18.04.2+esm8"
},
{
"binary_name": "tomcat9-user",
"binary_version": "9.0.16-3ubuntu0.18.04.2+esm8"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "tomcat9",
"purl": "pkg:deb/ubuntu/tomcat9@9.0.16-3ubuntu0.18.04.2+esm8?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"9.0.16-3~18.04.1",
"9.0.16-3ubuntu0.18.04.1",
"9.0.16-3ubuntu0.18.04.2",
"9.0.16-3ubuntu0.18.04.2+esm1",
"9.0.16-3ubuntu0.18.04.2+esm2",
"9.0.16-3ubuntu0.18.04.2+esm3",
"9.0.16-3ubuntu0.18.04.2+esm4",
"9.0.16-3ubuntu0.18.04.2+esm5",
"9.0.16-3ubuntu0.18.04.2+esm6",
"9.0.16-3ubuntu0.18.04.2+esm7",
"9.0.16-3ubuntu0.18.04.2+esm8"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libtomcat9-embed-java",
"binary_version": "9.0.31-1ubuntu0.9+esm3"
},
{
"binary_name": "libtomcat9-java",
"binary_version": "9.0.31-1ubuntu0.9+esm3"
},
{
"binary_name": "tomcat9",
"binary_version": "9.0.31-1ubuntu0.9+esm3"
},
{
"binary_name": "tomcat9-admin",
"binary_version": "9.0.31-1ubuntu0.9+esm3"
},
{
"binary_name": "tomcat9-common",
"binary_version": "9.0.31-1ubuntu0.9+esm3"
},
{
"binary_name": "tomcat9-docs",
"binary_version": "9.0.31-1ubuntu0.9+esm3"
},
{
"binary_name": "tomcat9-examples",
"binary_version": "9.0.31-1ubuntu0.9+esm3"
},
{
"binary_name": "tomcat9-user",
"binary_version": "9.0.31-1ubuntu0.9+esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "tomcat9",
"purl": "pkg:deb/ubuntu/tomcat9@9.0.31-1ubuntu0.9+esm3?arch=source\u0026distro=esm-apps/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"9.0.24-1",
"9.0.27-1",
"9.0.31-1",
"9.0.31-1ubuntu0.1",
"9.0.31-1ubuntu0.2",
"9.0.31-1ubuntu0.3",
"9.0.31-1ubuntu0.4",
"9.0.31-1ubuntu0.5",
"9.0.31-1ubuntu0.6",
"9.0.31-1ubuntu0.7",
"9.0.31-1ubuntu0.8",
"9.0.31-1ubuntu0.9",
"9.0.31-1ubuntu0.9+esm1",
"9.0.31-1ubuntu0.9+esm2",
"9.0.31-1ubuntu0.9+esm3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libtomcat9-embed-java",
"binary_version": "9.0.58-1ubuntu0.2+esm4"
},
{
"binary_name": "libtomcat9-java",
"binary_version": "9.0.58-1ubuntu0.2+esm4"
},
{
"binary_name": "tomcat9",
"binary_version": "9.0.58-1ubuntu0.2+esm4"
},
{
"binary_name": "tomcat9-admin",
"binary_version": "9.0.58-1ubuntu0.2+esm4"
},
{
"binary_name": "tomcat9-common",
"binary_version": "9.0.58-1ubuntu0.2+esm4"
},
{
"binary_name": "tomcat9-docs",
"binary_version": "9.0.58-1ubuntu0.2+esm4"
},
{
"binary_name": "tomcat9-examples",
"binary_version": "9.0.58-1ubuntu0.2+esm4"
},
{
"binary_name": "tomcat9-user",
"binary_version": "9.0.58-1ubuntu0.2+esm4"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:22.04:LTS",
"name": "tomcat9",
"purl": "pkg:deb/ubuntu/tomcat9@9.0.58-1ubuntu0.2+esm4?arch=source\u0026distro=esm-apps/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"9.0.43-3",
"9.0.54-1",
"9.0.55-1",
"9.0.58-1",
"9.0.58-1ubuntu0.1",
"9.0.58-1ubuntu0.1+esm1",
"9.0.58-1ubuntu0.1+esm2",
"9.0.58-1ubuntu0.1+esm3",
"9.0.58-1ubuntu0.1+esm4",
"9.0.58-1ubuntu0.2",
"9.0.58-1ubuntu0.2+esm1",
"9.0.58-1ubuntu0.2+esm2",
"9.0.58-1ubuntu0.2+esm3",
"9.0.58-1ubuntu0.2+esm4"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libtomcat10-embed-java",
"binary_version": "10.1.55-1ubuntu2~24.04.1"
},
{
"binary_name": "libtomcat10-java",
"binary_version": "10.1.55-1ubuntu2~24.04.1"
},
{
"binary_name": "tomcat10",
"binary_version": "10.1.55-1ubuntu2~24.04.1"
},
{
"binary_name": "tomcat10-admin",
"binary_version": "10.1.55-1ubuntu2~24.04.1"
},
{
"binary_name": "tomcat10-common",
"binary_version": "10.1.55-1ubuntu2~24.04.1"
},
{
"binary_name": "tomcat10-docs",
"binary_version": "10.1.55-1ubuntu2~24.04.1"
},
{
"binary_name": "tomcat10-examples",
"binary_version": "10.1.55-1ubuntu2~24.04.1"
},
{
"binary_name": "tomcat10-user",
"binary_version": "10.1.55-1ubuntu2~24.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "tomcat10",
"purl": "pkg:deb/ubuntu/tomcat10@10.1.55-1ubuntu2~24.04.1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"10.1.10-1",
"10.1.14-1",
"10.1.15-1",
"10.1.16-1",
"10.1.16-1ubuntu0.1~esm1",
"10.1.16-1ubuntu0.1~esm2",
"10.1.16-1ubuntu0.1~esm3",
"10.1.16-1ubuntu0.1~esm4",
"10.1.55-1ubuntu2~24.04.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libtomcat10-embed-java",
"binary_version": "10.1.40-1ubuntu1.25.10.1"
},
{
"binary_name": "libtomcat10-java",
"binary_version": "10.1.40-1ubuntu1.25.10.1"
},
{
"binary_name": "tomcat10",
"binary_version": "10.1.40-1ubuntu1.25.10.1"
},
{
"binary_name": "tomcat10-admin",
"binary_version": "10.1.40-1ubuntu1.25.10.1"
},
{
"binary_name": "tomcat10-common",
"binary_version": "10.1.40-1ubuntu1.25.10.1"
},
{
"binary_name": "tomcat10-docs",
"binary_version": "10.1.40-1ubuntu1.25.10.1"
},
{
"binary_name": "tomcat10-examples",
"binary_version": "10.1.40-1ubuntu1.25.10.1"
},
{
"binary_name": "tomcat10-user",
"binary_version": "10.1.40-1ubuntu1.25.10.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "tomcat10",
"purl": "pkg:deb/ubuntu/tomcat10@10.1.40-1ubuntu1.25.10.1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"10.1.35-1",
"10.1.40-1",
"10.1.40-1ubuntu1",
"10.1.40-1ubuntu1.25.10.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libtomcat11-embed-java",
"binary_version": "11.0.6-1"
},
{
"binary_name": "libtomcat11-java",
"binary_version": "11.0.6-1"
},
{
"binary_name": "tomcat11",
"binary_version": "11.0.6-1"
},
{
"binary_name": "tomcat11-admin",
"binary_version": "11.0.6-1"
},
{
"binary_name": "tomcat11-common",
"binary_version": "11.0.6-1"
},
{
"binary_name": "tomcat11-docs",
"binary_version": "11.0.6-1"
},
{
"binary_name": "tomcat11-examples",
"binary_version": "11.0.6-1"
},
{
"binary_name": "tomcat11-user",
"binary_version": "11.0.6-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "tomcat11",
"purl": "pkg:deb/ubuntu/tomcat11@11.0.6-1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"11.0.6-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libtomcat10-embed-java",
"binary_version": "10.1.55-1ubuntu2~26.04.1"
},
{
"binary_name": "libtomcat10-java",
"binary_version": "10.1.55-1ubuntu2~26.04.1"
},
{
"binary_name": "tomcat10",
"binary_version": "10.1.55-1ubuntu2~26.04.1"
},
{
"binary_name": "tomcat10-admin",
"binary_version": "10.1.55-1ubuntu2~26.04.1"
},
{
"binary_name": "tomcat10-common",
"binary_version": "10.1.55-1ubuntu2~26.04.1"
},
{
"binary_name": "tomcat10-docs",
"binary_version": "10.1.55-1ubuntu2~26.04.1"
},
{
"binary_name": "tomcat10-examples",
"binary_version": "10.1.55-1ubuntu2~26.04.1"
},
{
"binary_name": "tomcat10-user",
"binary_version": "10.1.55-1ubuntu2~26.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "tomcat10",
"purl": "pkg:deb/ubuntu/tomcat10@10.1.55-1ubuntu2~26.04.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"10.1.40-1ubuntu1",
"10.1.40-1ubuntu1.26.04.1",
"10.1.55-1ubuntu2~26.04.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libtomcat11-embed-java",
"binary_version": "11.0.22-2ubuntu2~26.04.1"
},
{
"binary_name": "libtomcat11-java",
"binary_version": "11.0.22-2ubuntu2~26.04.1"
},
{
"binary_name": "tomcat11",
"binary_version": "11.0.22-2ubuntu2~26.04.1"
},
{
"binary_name": "tomcat11-admin",
"binary_version": "11.0.22-2ubuntu2~26.04.1"
},
{
"binary_name": "tomcat11-common",
"binary_version": "11.0.22-2ubuntu2~26.04.1"
},
{
"binary_name": "tomcat11-docs",
"binary_version": "11.0.22-2ubuntu2~26.04.1"
},
{
"binary_name": "tomcat11-examples",
"binary_version": "11.0.22-2ubuntu2~26.04.1"
},
{
"binary_name": "tomcat11-user",
"binary_version": "11.0.22-2ubuntu2~26.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "tomcat11",
"purl": "pkg:deb/ubuntu/tomcat11@11.0.22-2ubuntu2~26.04.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"11.0.6-1",
"11.0.11-1",
"11.0.15-1",
"11.0.18-1",
"11.0.18-1ubuntu0.1~esm1",
"11.0.22-2ubuntu2~26.04.1"
]
}
],
"aliases": [],
"details": "Uncontrolled Resource Consumption vulnerability in Apache Tomcat if an HTTP/2 client did not acknowledge the initial settings frame that reduces the maximum permitted concurrent streams. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.8, from 10.1.0-M1 through 10.1.42, from 9.0.0.M1 through 9.0.106. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 through 8.5.100.\u00a0Other EOL versions may also be affected. Users are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.",
"id": "UBUNTU-CVE-2025-53506",
"modified": "2026-07-29T23:13:21Z",
"published": "2025-07-10T20:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2025-53506"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-53506"
},
{
"type": "REPORT",
"url": "https://github.com/apache/tomcat/commit/be8f330f83ceddaf3baeed57522e571572b6b99b"
},
{
"type": "REPORT",
"url": "https://github.com/apache/tomcat/commit/2aa6261276ebe50b99276953591e3a2be7898bdb"
},
{
"type": "REPORT",
"url": "https://github.com/apache/tomcat/commit/434772930f362145516dd60681134e7f0cf8115b"
},
{
"type": "REPORT",
"url": "https://lists.apache.org/thread/p09775q0rd185m6zz98krg0fp45j8kr0"
}
],
"related": [],
"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-2025-53506"
]
}
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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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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
model, served locally by ML-Gateway.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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