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CVE-2025-48989

Apache Tomcat: h2 DoS - Made You Reset

HIGH
7.5
CVSS Score
Published: August 13, 2025 at 12:11 PM UTC
Updated: June 17, 2026 at 09:30 AM UTC
2 products affected across 2 vendorsTomcatSIMATIC CN 4100

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Severity
HIGH7.5
Exploit prediction
EPSS 4%
SSVC
No known exploit

Description

Improper Resource Shutdown or Release vulnerability in Apache Tomcat made Tomcat vulnerable to the made you reset attack. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.9, from 10.1.0-M1 through 10.1.43 and from 9.0.0.M1 through 9.0.107. Older, EOL versions may also be affected. Users are recommended to upgrade to one of versions 11.0.10, 10.1.44 or 9.0.108 which fix the issue.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Tomcat· Apache
95%
10.0.0 ≤ v < 10.1.4410.1.0-M1 ≤ v ≤ 10.1.4311.0.0 ≤ v < 11.0.1011.0.0-M1 ≤ v ≤ 11.0.99.0.0.M1 ≤ v ≤ 9.0.1079.0.1 ≤ v < 9.0.10810.1.0-M111.0.0-M19.0.0 milestone19.0.0 milestone109.0.0 milestone119.0.0 milestone129.0.0 milestone139.0.0 milestone149.0.0 milestone159.0.0 milestone169.0.0 milestone179.0.0 milestone189.0.0 milestone199.0.0 milestone29.0.0 milestone209.0.0 milestone219.0.0 milestone229.0.0 milestone239.0.0 milestone249.0.0 milestone259.0.0 milestone269.0.0 milestone279.0.0 milestone39.0.0 milestone49.0.0 milestone59.0.0 milestone69.0.0 milestone79.0.0 milestone89.0.0 milestone99.0.0.M1
Affected range stops below 10.1.44, so it looks safe — our inference, not a vendor statement
Affected range stops below 11.0.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.0.108, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 10.0.0-M1 (unknown)
Vendor states this is fixed in 8.5.0 (unknown)
SIMATIC CN 4100· Siemens
60%
v < V5.0
Affected range stops below V5.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

Vendor AdvisoryMailing List
Source: [email protected]
https://lists.apache.org/thread/9ydfg0xr0tchmglcprhxgwhj0hfwxlyf
Source: af854a3a-2127-422b-91ae-364da2661108
http://www.openwall.com/lists/oss-security/2025/08/13/2
Source: af854a3a-2127-422b-91ae-364da2661108
https://www.kb.cert.org/vuls/id/767506
Source: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
https://cert-portal.siemens.com/productcert/html/ssa-032379.html

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-404

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