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CVE-2025-53506

Apache Tomcat: DoS via excessive h2 streams at connection start

Published: Jul 10, 2025Updated: Nov 4, 2025 Sources: CVE List NVD GHSA BDUCWE-400
NVD MITRE
7.5CVSSHIGH
EPSS Score
1.9%
Top 23.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-400

Affected Products

РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
РОСА ХРОМАО «НТЦ ИТ РОСА»
On-prem
Operating Systems / linux-distro
АЛЬТ СП 10АО «ИВК»
On-premOS
Operating Systems / linux-distro
TomcatApache Software Foundation
On-premWeb App
Networking Infrastructure / load-balancer-proxy
Platform V SberLinux OS ServerАО «СберТех»
On-premOS
Operating Systems / linux-distro
ооо «ред софт»commercialRUOperating Systemsaka red soft
ао «нтц ит роса»commercialRUOperating Systems
ао «ивк»commercialRUOperating Systemsaka ivk
apache software foundationoss-projectUSWeb & CMS Pluginsaka apache foundation
ао «сбертех»commercialRUOperating Systemsaka ao sbertech, сбертех
and 5 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://lists.apache.org/thread/trqq01bbxw6c92zx69kx2mw2qgmfy0o5
lists.apache.org
http://repo.red-soft.ru/redos/7.3c/x86_64/updates/
repo.red-soft.ru
https://abf.rosa.ru/advisories/ROSA-SA-2025-2994
abf.rosa.ru
and 10 more references View all →

Timeline

Published
Jul 10, 2025
Last Updated
Nov 4, 2025

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