Security advisory
In Undertow 2.x before 2.0.0.Alpha2, 1.4.x before 1.4.17.Final, and 1.3.x before 1.3.31.Final, it was found that the fix for CVE-2017-2666 was incomplete and invalid characters are still allowed in the query string and path parameters. This could be exploited, in conjunction with a proxy that also permitted the invalid characters but with a different interpretation, to inject data into the HTTP response. By manipulating the HTTP response the attacker could poison a web-cache, perform an XSS attack, or obtain sensitive information from requests other than their own.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2017-7559
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 07:36 UTC · Revision 1
Source evidence
In Undertow 2.x before 2.0.0.Alpha2, 1.4.x before 1.4.17.Final, and 1.3.x before 1.3.31.Final, it was found that the fix for CVE-2017-2666 was incomplete and invalid characters are still allowed in the query string and path parameters. This could be exploited, in conjunction with a proxy that also permitted the invalid characters but with a different interpretation, to inject data into the HTTP response. By manipulating the HTTP response the attacker could poison a web-cache, perform an XSS attack, or obtain sensitive information from requests other than their own.
osv:CVE-2017-7559
Complete source record
{
"id": "21d1c012a03b53f6abf68eba96233e20e9c3d14bae606cc8b3eb5b3eaf6079f9",
"url": "https://osv.dev/vulnerability/CVE-2017-7559",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2017-7559",
"summary": "In Undertow 2.x before 2.0.0.Alpha2, 1.4.x before 1.4.17.Final, and 1.3.x before 1.3.31.Final, it was found that the fix for CVE-2017-2666 was incomplete and invalid characters are still allowed in the query string and path parameters. This could be exploited, in conjunction with a proxy that also permitted the invalid characters but with a different interpretation, to inject data into the HTTP response. By manipulating the HTTP response the attacker could poison a web-cache, perform an XSS attack, or obtain sensitive information from requests other than their own.",
"evidence": "osv:CVE-2017-7559",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2017-7559",
"aliases": [
"CVE-2017-7559",
"GHSA-rj76-h87p-r3wf"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/undertow-io/undertow",
"type": "GIT",
"events": [
{
"introduced": "0b340d10071a6b73bb0b5412974fd342afbcd9ea"
},
{
"fixed": "ca20c31781dd721837775b92ad5783d742546e17"
},
{
"introduced": "967b5ecf796fe32afb9a131c7695f731b51303ca"
},
{
"fixed": "9353aa465ba960f0c363fd9d8a164e42c0bccafa"
},
{
"introduced": "8947afcaa36dc1b8db3b355b9804893dc38a8abf"
},
{
"last_affected": "8947afcaa36dc1b8db3b355b9804893dc38a8abf"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:redhat:undertow:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "1.3.0"
},
{
"fixed": "1.3.31"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:redhat:undertow:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "1.4.0"
},
{
"fixed": "1.4.17"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:redhat:undertow:2.0.0:alpha1:*:*:*:*:*:*",
"range": [
{
"introduced": "2.0.0-alpha1"
},
{
"last_affected": "2.0.0-alpha1"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
"2.0.0-alpha1",
"1.4.16.Final",
"1.3.30.Final",
"1.4.15.Final",
"1.4.14.Final",
"1.4.13.Final",
"1.4.12.Final",
"1.3.28.Final",
"1.4.11.Final",
"1.3.27.Final",
"1.4.10.Final",
"1.3.26.Final",
"1.4.8.Final",
"1.4.7.Final",
"1.4.6.Final",
"1.4.5.Final",
"1.4.4.Final",
"1.3.25.Final",
"1.4.3.Final",
"1.4.2.Final",
"1.4.1.Final",
"1.4.0.Final",
"1.3.24.Final",
"1.3.23.Final",
"1.3.22.Final",
"1.3.21.Final",
"2.0.0.Alpha1",
"1.3.20.Final",
"1.3.19.Final",
"1.3.18.Final",
"1.3.17.Final",
"1.3.16.Final",
"1.3.15.Final",
"1.3.14.Final",
"1.3.13.Final",
"1.3.12.Final",
"1.3.11.Final",
"1.3.10.Final",
"1.3.9.Final",
"1.3.8.Final",
"1.3.7.Final",
"1.3.6.Final",
"1.3.5.Final",
"1.3.3.Final",
"1.3.2.Final",
"1.3.1.Final",
"1.3.0.Final"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-7559.json"
}
}
],
"modified": "2026-10-24T10:30:55.492724066Z",
"provider": "osv",
"references": [
"https://access.redhat.com/errata/RHSA-2017:3454",
"https://access.redhat.com/errata/RHSA-2017:3455",
"https://access.redhat.com/errata/RHSA-2017:3456",
"https://access.redhat.com/errata/RHSA-2017:3458",
"https://access.redhat.com/errata/RHSA-2018:0002",
"https://access.redhat.com/errata/RHSA-2018:0003",
"https://access.redhat.com/errata/RHSA-2018:0004",
"https://access.redhat.com/errata/RHSA-2018:0005",
"https://access.redhat.com/errata/RHSA-2018:1322",
"https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7559",
"https://issues.jboss.org/browse/UNDERTOW-1251"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2017-7559",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 438432,
"published_at": "2018-01-10T15:29:00.317+00:00"
}