High
Security advisory
In verify_emsa_pkcs1_signature() in gmp_rsa_public_key.c in the gmp plugin in strongSwan 4.x and 5.x before 5.7.0, the RSA implementation based on GMP does not reject excess data after the encoded algorithm OID during PKCS#1 v1.5 signature verification. Similar to the flaw in the same version of strongSwan regarding digestAlgorithm.parameters, a remote attacker can forge signatures when small public exponents are being used, which could lead to impersonation when only an RSA signature is used for IKEv2 authentication.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2018-16151
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 05:01 UTC · Revision 1
Source evidence
In verify_emsa_pkcs1_signature() in gmp_rsa_public_key.c in the gmp plugin in strongSwan 4.x and 5.x before 5.7.0, the RSA implementation based on GMP does not reject excess data after the encoded algorithm OID during PKCS#1 v1.5 signature verification. Similar to the flaw in the same version of strongSwan regarding digestAlgorithm.parameters, a remote attacker can forge signatures when small public exponents are being used, which could lead to impersonation when only an RSA signature is used for IKEv2 authentication.
osv:CVE-2018-16151
Complete source record
{
"id": "66404b0b59cb5c46f2b0746870d6fe89c7de55814a1cbff34fe8a63a4f6dc8b3",
"url": "https://osv.dev/vulnerability/CVE-2018-16151",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2018-16151",
"summary": "In verify_emsa_pkcs1_signature() in gmp_rsa_public_key.c in the gmp plugin in strongSwan 4.x and 5.x before 5.7.0, the RSA implementation based on GMP does not reject excess data after the encoded algorithm OID during PKCS#1 v1.5 signature verification. Similar to the flaw in the same version of strongSwan regarding digestAlgorithm.parameters, a remote attacker can forge signatures when small public exponents are being used, which could lead to impersonation when only an RSA signature is used for IKEv2 authentication.",
"evidence": "osv:CVE-2018-16151",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2018-16151",
"aliases": [
"CVE-2018-16151"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
}
],
"affected": [
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"type": "GIT",
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{
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-16151.json"
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}
],
"modified": "2026-10-24T10:30:23.866530557Z",
"provider": "osv",
"references": [
"https://lists.debian.org/debian-lts-announce/2018/09/msg00032.html",
"https://security.gentoo.org/glsa/201811-16",
"https://usn.ubuntu.com/3771-1/",
"https://www.debian.org/security/2018/dsa-4305",
"https://www.strongswan.org/blog/2018/09/24/strongswan-vulnerability-%28cve-2018-16151%2C-cve-2018-16152%29.html"
],
"provider_metadata": {
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"source": "CPE_STRING"
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{
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},
"related_cves": [
{
"value": "CVE-2018-16151",
"evidence": "/id"
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 431023,
"published_at": "2018-09-26T21:29:01.087+00:00"
}