CVE-2025-9784

A flaw was found in Undertow where malformed client requests can trigger server-side stream resets without triggering abuse counters. This issue, referred to as the "MadeYouReset" attack, allows malicious clients to induce excessive server workload by repeatedly causing server-side stream aborts. While not a protocol bug, this highlights a common implementation weakness that can be exploited to cause a denial of service (DoS).

References

Affected packages

Git / github.com/undertow-io/undertow

Affected ranges

Type: GIT
Repo: https://github.com/undertow-io/undertow
Events: Introduced

0 Unknown introduced commit / All previous commits are affected

Fixed

6267eb1328fa08d996cbf3643b91253310fc9dd6

Affected versions

1.*

1.0.0.Alpha1

1.0.0.Alpha10

1.0.0.Alpha11

1.0.0.Alpha12

1.0.0.Alpha13

1.0.0.Alpha14

1.0.0.Alpha15

1.0.0.Alpha16

1.0.0.Alpha17

1.0.0.Alpha18

1.0.0.Alpha19

1.0.0.Alpha2

1.0.0.Alpha20

1.0.0.Alpha21

1.0.0.Alpha22

1.0.0.Alpha3

1.0.0.Alpha4

1.0.0.Alpha5

1.0.0.Alpha6

1.0.0.Alpha7

1.0.0.Alpha8

1.0.0.Alpha9

1.0.0.Beta1

1.0.0.Beta10

1.0.0.Beta11

1.0.0.Beta12

1.0.0.Beta13

1.0.0.Beta14

1.0.0.Beta15

1.0.0.Beta16

1.0.0.Beta17

1.0.0.Beta18

1.0.0.Beta19

1.0.0.Beta2

1.0.0.Beta20

1.0.0.Beta21

1.0.0.Beta22

1.0.0.Beta23

1.0.0.Beta24

1.0.0.Beta25

1.0.0.Beta26

1.0.0.Beta27

1.0.0.Beta28

1.0.0.Beta29

1.0.0.Beta3

1.0.0.Beta30

1.0.0.Beta31

1.0.0.Beta32

1.0.0.Beta33

1.0.0.Beta4

1.0.0.Beta5

1.0.0.Beta6

1.0.0.Beta7

1.0.0.Beta8

1.0.0.Beta9

1.0.0.CR1

1.0.0.CR2

1.0.0.CR3

1.0.0.CR4

1.0.0.Final

1.0.1.Final

1.0.2.Final

1.0.3.Final

1.1.0.Beta1

1.1.0.Beta2

1.1.0.Beta3

1.1.0.Beta4

1.1.0.Beta5

1.1.0.Beta6

1.1.0.Beta7

1.1.0.Beta8

1.2.0.Beta1

1.2.0.Beta10

1.2.0.Beta2

1.2.0.Beta3

1.2.0.Beta4

1.2.0.Beta5

1.2.0.Beta6

1.2.0.Beta7

1.2.0.Beta8

1.2.0.Beta9

1.2.0.CR1

1.2.0.Final

1.2.1.Final

1.2.2.Final

1.2.3.Final

1.2.4.Final

1.3.0.Beta1

1.3.0.Beta10

1.3.0.Beta11

1.3.0.Beta12

1.3.0.Beta13

1.3.0.Beta2

1.3.0.Beta3

1.3.0.Beta4

1.3.0.Beta5

1.3.0.Beta6

1.3.0.Beta7

1.3.0.Beta8

1.3.0.Beta9

1.3.0.CR1

1.3.0.CR2

1.3.0.CR3

1.3.0.Final

1.3.1.Final

1.3.2.Final

1.3.3.Final

2.*

2.0.0.Alpha1

2.0.0.Beta1

2.0.0.Final

2.0.1.Final

2.0.10.Final

2.0.11.Final

2.0.12.Final

2.0.13.Final

2.0.14.Final

2.0.15.Final

2.0.16.Final

2.0.17.Final

2.0.2.Final

2.0.20.Final

2.0.21.Final

2.0.22.Final

2.0.23.Final

2.0.24.Final

2.0.25.Final

2.0.26.Final

2.0.27.Final

2.0.28.Final

2.0.29.Final

2.0.3.Final

2.0.4.Final

2.0.5.Final

2.0.6.Final

2.0.7.Final

2.0.8.Final

2.0.9.Final

2.1.0.Final

2.1.1.Final

2.1.2.Final

2.1.3.Final

2.1.4.Final

2.2.0.Final

2.2.1.Final

2.2.10.Final

2.2.11.Final

2.2.12.Final

2.2.13.Final

2.2.14.Final

2.2.15.Final

2.2.16.Final

2.2.17.Final

2.2.18.Final

2.2.19.Final

2.2.2.Final

2.2.20.Final

2.2.21.Final

2.2.22.Final

2.2.23.Final

2.2.24.Final

2.2.25.Final

2.2.26.Final

2.2.27.Final

2.2.28.Final

2.2.3.Final

2.2.30.Final

2.2.31.Final

2.2.32.Final

2.2.33.Final

2.2.34.Final

2.2.35.Final

2.2.36.Final

2.2.37.Final

2.2.4.Final

2.2.5.Final

2.2.6.Final

2.2.7.Final

2.2.8.Final

2.2.9.Final

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-9784.json"

unresolved_ranges

[
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "7.0.0"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "7.0.0"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "8.0.0"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "7.0"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "7.0"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "8.0"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "9.0"
            }
        ]
    }
]