High
Security advisory
A flaw was found in Undertow that tripped the client-side invocation timeout with certain calls made over HTTP2. This flaw allows an attacker to carry out denial of service attacks.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-3859
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:45 UTC · Revision 1
Source evidence
A flaw was found in Undertow that tripped the client-side invocation timeout with certain calls made over HTTP2. This flaw allows an attacker to carry out denial of service attacks.
osv:CVE-2021-3859
Complete source record
{
"id": "47cf5bd0183268b46e94d2221db981fbd8bd25e132632c0504679758f6d22603",
"url": "https://osv.dev/vulnerability/CVE-2021-3859",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-3859",
"summary": "A flaw was found in Undertow that tripped the client-side invocation timeout with certain calls made over HTTP2. This flaw allows an attacker to carry out denial of service attacks.",
"evidence": "osv:CVE-2021-3859",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2021-3859",
"aliases": [
"CVE-2021-3859",
"GHSA-339q-62wm-c39w"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/undertow-io/undertow",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "c0b0d337dbb56bbc5f5190dd9ba6579a8afbd17d"
},
{
"fixed": "e43f0ada3f4da6e8579e0020cec3cb1a81e487c2"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:redhat:undertow:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2.2.15"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "e43f0ada3f4da6e8579e0020cec3cb1a81e487c2"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"2.2.14.Final",
"2.2.13.Final",
"2.2.12.Final",
"2.2.11.Final",
"2.2.10.Final",
"2.2.9.Final",
"2.2.8.Final",
"2.2.7.Final",
"2.2.6.Final",
"2.2.5.Final",
"2.2.3.Final",
"2.2.4.Final",
"2.2.2.Final",
"2.1.4.Final",
"2.2.1.Final",
"2.2.0.Final",
"2.1.3.Final",
"2.1.2.Final",
"2.1.1.Final",
"2.1.0.Final",
"2.0.29.Final",
"2.0.28.Final",
"2.0.27.Final",
"2.0.26.Final",
"2.0.25.Final",
"2.0.24.Final",
"2.0.23.Final",
"2.0.22.Final",
"2.0.21.Final",
"2.0.20.Final",
"2.0.17.Final",
"2.0.16.Final",
"2.0.15.Final",
"2.0.14.Final",
"2.0.13.Final",
"2.0.12.Final",
"2.0.11.Final",
"2.0.10.Final",
"2.0.9.Final",
"2.0.8.Final",
"2.0.7.Final",
"2.0.6.Final",
"2.0.5.Final",
"2.0.4.Final",
"2.0.3.Final",
"2.0.2.Final",
"2.0.1.Final",
"2.0.0.Final",
"2.0.0.Beta1",
"2.0.0.Alpha1",
"1.3.3.Final",
"1.3.2.Final",
"1.3.1.Final",
"1.3.0.Final",
"1.3.0.CR3",
"1.3.0.CR2",
"1.3.0.CR1",
"1.3.0.Beta13",
"1.3.0.Beta12",
"1.3.0.Beta11",
"1.3.0.Beta10",
"1.3.0.Beta9",
"1.3.0.Beta8",
"1.3.0.Beta7",
"1.3.0.Beta6",
"1.3.0.Beta5",
"1.3.0.Beta4",
"1.3.0.Beta3",
"1.3.0.Beta2",
"1.3.0.Beta1",
"1.2.4.Final",
"1.2.3.Final",
"1.2.2.Final",
"1.2.1.Final",
"1.2.0.Final",
"1.2.0.CR1",
"1.2.0.Beta10",
"1.2.0.Beta9",
"1.2.0.Beta8",
"1.2.0.Beta7",
"1.2.0.Beta6",
"1.2.0.Beta5",
"1.2.0.Beta4",
"1.2.0.Beta3",
"1.2.0.Beta2",
"1.2.0.Beta1",
"1.1.0.Beta8",
"1.1.0.Beta7",
"1.1.0.Beta6",
"1.1.0.Beta5",
"1.1.0.Beta4",
"1.1.0.Beta3",
"1.1.0.Beta2",
"1.1.0.Beta1",
"1.0.3.Final",
"1.0.2.Final",
"1.0.1.Final",
"1.0.0.Final",
"1.0.0.CR4",
"1.0.0.CR3",
"1.0.0.CR2",
"1.0.0.CR1",
"1.0.0.Beta33",
"1.0.0.Beta32",
"1.0.0.Beta31",
"1.0.0.Beta30",
"1.0.0.Beta29",
"1.0.0.Beta28",
"1.0.0.Beta27",
"1.0.0.Beta26",
"1.0.0.Beta25",
"1.0.0.Beta24",
"1.0.0.Beta23",
"1.0.0.Beta22",
"1.0.0.Beta21",
"1.0.0.Beta20",
"1.0.0.Beta19",
"1.0.0.Beta18",
"1.0.0.Beta17",
"1.0.0.Beta16",
"1.0.0.Beta15",
"1.0.0.Beta14",
"1.0.0.Beta13",
"1.0.0.Beta12",
"1.0.0.Beta11",
"1.0.0.Beta10",
"1.0.0.Beta9",
"1.0.0.Beta8",
"1.0.0.Beta7",
"1.0.0.Beta6",
"1.0.0.Beta5",
"1.0.0.Beta4",
"1.0.0.Beta3",
"1.0.0.Beta2",
"1.0.0.Beta1",
"1.0.0.Alpha22",
"1.0.0.Alpha21",
"1.0.0.Alpha20",
"1.0.0.Alpha19",
"1.0.0.Alpha18",
"1.0.0.Alpha17",
"1.0.0.Alpha16",
"1.0.0.Alpha15",
"1.0.0.Alpha14",
"1.0.0.Alpha13",
"1.0.0.Alpha12",
"1.0.0.Alpha11",
"1.0.0.Alpha10",
"1.0.0.Alpha9",
"1.0.0.Alpha8",
"1.0.0.Alpha7",
"1.0.0.Alpha6",
"1.0.0.Alpha5",
"1.0.0.Alpha4",
"1.0.0.Alpha3",
"1.0.0.Alpha2",
"1.0.0.Alpha1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3859.json",
"vanir_signatures": [
{
"id": "CVE-2021-3859-137c9e03",
"digest": {
"threshold": 0.9,
"line_hashes": [
"37843366493750751742619379260952401598",
"7440480657494467487553469539626601166",
"276016304061374303955031587394107556688",
"33025093169843178057269548979765714246",
"73007699941547598036833828651447045206",
"281097977987362871672003164118742789719",
"219130153540905508636829466680708263762",
"15958409315759019669908654030384320735"
]
},
"source": "https://github.com/undertow-io/undertow/commit/e43f0ada3f4da6e8579e0020cec3cb1a81e487c2",
"target": {
"file": "core/src/main/java/io/undertow/protocols/http2/HpackEncoder.java"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CVE-2021-3859-80ae0061",
"digest": {
"threshold": 0.9,
"line_hashes": [
"278718351439749032103358072259880297915",
"217996040743920694930878954795178553663",
"194636829920015321065860618077163562720",
"272077580847901113784842885408509213057",
"335496155086488876403469198514903259863",
"93657172332355147865052391949714358868",
"10177502587792283635465765649640402178",
"6822285975597295230959649532656960108",
"2961991051668216914488364019458986316",
"271247688705289436524263595311819397500"
]
},
"source": "https://github.com/undertow-io/undertow/commit/e43f0ada3f4da6e8579e0020cec3cb1a81e487c2",
"target": {
"file": "core/src/main/java/io/undertow/protocols/http2/Http2Channel.java"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CVE-2021-3859-a100b2a7",
"digest": {
"length": 2626,
"function_hash": "197540148066880075987836166995993802539"
},
"source": "https://github.com/undertow-io/undertow/commit/e43f0ada3f4da6e8579e0020cec3cb1a81e487c2",
"target": {
"file": "core/src/main/java/io/undertow/protocols/http2/HpackEncoder.java",
"function": "encode"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2021-3859-b0ceb238",
"digest": {
"length": 1089,
"function_hash": "291203542927830118324038302489004741089"
},
"source": "https://github.com/undertow-io/undertow/commit/e43f0ada3f4da6e8579e0020cec3cb1a81e487c2",
"target": {
"file": "core/src/main/java/io/undertow/protocols/http2/Http2Channel.java",
"function": "parseFrame"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-20T14:26:16Z"
}
}
],
"modified": "2026-10-20T14:26:16.505124982Z",
"provider": "osv",
"references": [
"https://access.redhat.com/security/cve/CVE-2021-3859",
"https://github.com/undertow-io/undertow/pull/1296",
"https://security.netapp.com/advisory/ntap-20221201-0004/",
"https://bugzilla.redhat.com/show_bug.cgi?id=2010378",
"https://github.com/undertow-io/undertow/commit/e43f0ada3f4da6e8579e0020cec3cb1a81e487c2",
"https://issues.redhat.com/browse/UNDERTOW-1979"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.3:*:*:*:*:*:*:*",
"cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.4:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:jboss_enterprise_application_platform",
"extracted_events": [
{
"range": [
{
"introduced": "7.3"
},
{
"last_affected": "7.3"
},
{
"introduced": "7.4"
},
{
"last_affected": "7.4"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:redhat:single_sign-on:7.4.10:*:*:*:*:*:*:*",
"cpe:2.3:a:redhat:single_sign-on:7.5.1:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:single_sign-on",
"extracted_events": [
{
"range": [
{
"introduced": "7.4.10"
},
{
"last_affected": "7.4.10"
},
{
"introduced": "7.5.1"
},
{
"last_affected": "7.5.1"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2021-3859",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 388983,
"published_at": "2022-08-26T16:15:09.623+00:00"
}