High
strongSwan 4.5.0 < 6.0.5 EAP-TTLS AVP Parsing Integer Underflow
Type: advisorySources: OSV
strongSwan versions 4.5.0 prior to 6.0.5 contain an integer underflow vulnerability in the EAP-TTLS AVP parser that allows unauthenticated remote attackers to cause a denial of service by sending crafted AVP data with invalid length fields during IKEv2 authentication. Attackers can exploit the failure to validate AVP length fields before subtraction to trigger excessive memory allocation or NULL pointer dereference, crashing the charon IKE daemon.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-25075
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 20:23 UTC · Revision 1
Source evidence
strongSwan 4.5.0 < 6.0.5 EAP-TTLS AVP Parsing Integer Underflow
core-osv · Original sourcePublished 23 Mar 2026, 18:33 UTC
strongSwan versions 4.5.0 prior to 6.0.5 contain an integer underflow vulnerability in the EAP-TTLS AVP parser that allows unauthenticated remote attackers to cause a denial of service by sending crafted AVP data with invalid length fields during IKEv2 authentication. Attackers can exploit the failure to validate AVP length fields before subtraction to trigger excessive memory allocation or NULL pointer dereference, crashing the charon IKE daemon.
osv:CVE-2026-25075
Complete source record
{
"id": "57a6ae2e0d99d91a1c73ada999f60922ab008759aa94620796d8ddc8ade2dda1",
"url": "https://osv.dev/vulnerability/CVE-2026-25075",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "strongSwan 4.5.0 < 6.0.5 EAP-TTLS AVP Parsing Integer Underflow",
"summary": "strongSwan versions 4.5.0 prior to 6.0.5 contain an integer underflow vulnerability in the EAP-TTLS AVP parser that allows unauthenticated remote attackers to cause a denial of service by sending crafted AVP data with invalid length fields during IKEv2 authentication. Attackers can exploit the failure to validate AVP length fields before subtraction to trigger excessive memory allocation or NULL pointer dereference, crashing the charon IKE daemon.",
"evidence": "osv:CVE-2026-25075",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-25075",
"aliases": [
"CVE-2026-25075"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/strongswan/strongswan",
"type": "GIT",
"events": [
{
"introduced": "327aa0c0120feef11c5a4bdba77a7d26875c9e60"
},
{
"fixed": "a05dfdc3fffda409e83fdf9e7c5e5e423c7c1e02"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "4.5.0"
},
{
"fixed": "6.0.5"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
}
}
],
"versions": [
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-25075.json"
}
}
],
"modified": "2026-10-28T02:30:39.059656349Z",
"provider": "osv",
"references": [
"https://lists.debian.org/debian-lts-announce/2026/03/msg00016.html",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25075.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-25075",
"https://www.strongswan.org/blog/2026/03/23/strongswan-6.0.5-released.html",
"https://www.vulncheck.com/advisories/strongswan-eap-ttls-avp-parsing-integer-underflow",
"https://github.com/strongswan/strongswan",
"https://www.strongswan.org/blog/2026/03/23/strongswan-vulnerability-(cve-2026-25075).html",
"https://y637f9qq2x.com/posts/cve-2026-25075/"
],
"provider_metadata": {
"cwe_ids": [
"CWE-191",
"CWE-476"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25075.json"
}
},
"related_cves": [
{
"value": "CVE-2026-25075",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 506640,
"published_at": "2026-03-23T18:33:10.952+00:00"
}