CriticalFix available
strongswan — security advisory
In strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too early without actually authenticating the client and (in the case of EAP methods with mutual authentication and EAP-only authentication for IKEv2) even without server authentication.
- Products
- strongswan
- Affected versions
- Not specified
- Fixed versions
- 5.9.1-r2, 5.9.1-r3, 5.9.1-r4
- CVEs
- CVE-2021-45079
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 22:07 UTC · Revision 1
Source evidence
In strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too early without actually authenticating the client and (in the case of EAP methods with mutual authentication and EAP-only authentication for IKEv2) even without server authentication.
osv:ALPINE-CVE-2021-45079
strongswan
Fixed versions: 5.9.1-r2
strongswan
Fixed versions: 5.9.1-r3
strongswan
Fixed versions: 5.9.1-r4
strongswan
Fixed versions: 5.9.1-r4
strongswan
Fixed versions: 5.9.1-r4
strongswan
Fixed versions: 5.9.1-r4
strongswan
Fixed versions: 5.9.1-r4
strongswan
Fixed versions: 5.9.1-r4
strongswan
Fixed versions: 5.9.1-r4
strongswan
Fixed versions: 5.9.1-r4
strongswan
Fixed versions: 5.9.1-r4
strongswan
Fixed versions: 5.9.1-r4
Complete source record
{
"id": "2808d4bf4c498a4bb1c3df41d957de4ddaa424bdf84705a98726e98f3ef92dc7",
"url": "https://osv.dev/vulnerability/ALPINE-CVE-2021-45079",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ALPINE-CVE-2021-45079",
"summary": "In strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too early without actually authenticating the client and (in the case of EAP methods with mutual authentication and EAP-only authentication for IKEv2) even without server authentication.",
"evidence": "osv:ALPINE-CVE-2021-45079",
"products": [
{
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"evidence": "/affected/0/package/name"
},
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{
"name": {
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{
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{
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{
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],
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{
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{
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{
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{
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],
"severity": "critical",
"structured": {
"id": "ALPINE-CVE-2021-45079",
"aliases": [
"ALPINE-CVE-2021-45079"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "4.1.2"
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{
"fixed": "5.9.1-r2"
}
]
}
],
"package": {
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"ecosystem": "Alpine:v3.13"
},
"database_specific": {
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},
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{
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{
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]
}
],
"package": {
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"purl": "pkg:apk/alpine/strongswan?arch=source",
"ecosystem": "Alpine:v3.14"
},
"database_specific": {
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},
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{
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{
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}
]
}
],
"package": {
"name": "strongswan",
"purl": "pkg:apk/alpine/strongswan?arch=source",
"ecosystem": "Alpine:v3.15"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-45079.json"
},
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{
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],
"package": {
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"ecosystem": "Alpine:v3.16"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-45079.json"
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{
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{
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],
"package": {
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"database_specific": {
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"name": "strongswan",
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"ecosystem": "Alpine:v3.19"
},
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"package": {
"name": "strongswan",
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"ecosystem": "Alpine:v3.20"
},
"database_specific": {
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],
"package": {
"name": "strongswan",
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"ecosystem": "Alpine:v3.21"
},
"database_specific": {
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],
"package": {
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},
"database_specific": {
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{
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],
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},
"database_specific": {
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}
],
"modified": "2026-10-23T17:17:56.229129645Z",
"provider": "osv",
"upstream": [
"CVE-2021-45079"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2021-45079"
]
},
"related_cves": [
{
"value": "CVE-2021-45079",
"evidence": "/upstream"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 415614,
"published_at": "2022-01-31T08:15:07.307+00:00"
}