Medium
Security advisory
Libgcrypt before 1.7.10 and 1.8.x before 1.8.3 allows a memory-cache side-channel attack on ECDSA signatures that can be mitigated through the use of blinding during the signing process in the _gcry_ecc_ecdsa_sign function in cipher/ecc-ecdsa.c, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2018-0495
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 05:16 UTC · Revision 1
Source evidence
Libgcrypt before 1.7.10 and 1.8.x before 1.8.3 allows a memory-cache side-channel attack on ECDSA signatures that can be mitigated through the use of blinding during the signing process in the _gcry_ecc_ecdsa_sign function in cipher/ecc-ecdsa.c, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.
osv:CVE-2018-0495
Complete source record
{
"id": "3e25351234a2270ba25d7457fb6848bd4f50a4d56ca5eefc9aa8ffc737fac60e",
"url": "https://osv.dev/vulnerability/CVE-2018-0495",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2018-0495",
"summary": "Libgcrypt before 1.7.10 and 1.8.x before 1.8.3 allows a memory-cache side-channel attack on ECDSA signatures that can be mitigated through the use of blinding during the signing process in the _gcry_ecc_ecdsa_sign function in cipher/ecc-ecdsa.c, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.",
"evidence": "osv:CVE-2018-0495",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2018-0495",
"aliases": [
"CVE-2018-0495"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "git://git.gnupg.org/libgcrypt.git",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "ff8f7e53ce6b8a5681667595c6287323652ae157"
},
{
"introduced": "850aca744eeda5fd410f478a0778e353045ac962"
},
{
"fixed": "5600d2d6b23640b0114655214f18959ee81fe58e"
}
],
"database_specific": {
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{
"cpe": "cpe:2.3:a:gnupg:libgcrypt:*:*:*:*:*:*:*:*",
"range": [
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{
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}
],
"source": "CPE_RANGE"
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{
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"range": [
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},
{
"fixed": "1.8.3"
}
],
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}
]
}
}
],
"versions": [
"libgcrypt-1.8.2",
"libgcrypt-1.7.9",
"libgcrypt-1.8.1",
"libgcrypt-1.8.0",
"libgcrypt-1.7.8",
"libgcrypt-1.7.7",
"libgcrypt-1.7.6",
"libgcrypt-1.7.5",
"libgcrypt-1.7.4",
"libgcrypt-1.7.3",
"libgcrypt-1.7.2",
"libgcrypt-1.7.1",
"libgcrypt-1.7.0",
"libgcrypt-1.6.0",
"libgcrypt-1.5.0",
"libgcrypt-1.5.0-beta1",
"post-nuke-of-trailing-ws",
"ecc-integration-done",
"libgcrypt-1.4.4",
"libgcrypt-1.4.3",
"libgcrypt-1.4.2",
"libgcrypt-1.4.2rc2",
"libgcrypt-1.4.2rc1",
"libgcrypt-1.4.1",
"libgcrypt-1.4.1rc1",
"libgcrypt-1.4.0",
"libgcrypt-1.3.2",
"libgcrypt-1.3.1",
"libgcrypt-1.3.0",
"V1-2-1",
"V1-2-0",
"V1-1-94",
"marcus-after-thread-cbs",
"marcus-before-thread-cbs",
"V1-1-93",
"V1-1-92",
"V1-1-91",
"V1-1-90",
"V1-1-44",
"V1-1-43",
"V1-1-42",
"V1-1-12",
"V1-1-11",
"V1-1-10",
"V1-1-9",
"V1-1-8",
"V1-1-7",
"now-less-freedom-protected",
"last-gpl-version",
"V1-1-6",
"V1-1-5",
"V1-1-4",
"V1-1-3",
"V1-1-2",
"V1-1-0",
"DEVEL-BRANCH-1-1",
"V1-0-0",
"V0-9-11",
"V0-9-10",
"V0-9-9",
"V0-9-8",
"V0-9-7",
"V0-9-6",
"V0-9-5",
"V0-9-4",
"V1-0-4",
"V1-0-3",
"V1-0-2",
"V1-0-1-ePit-1",
"V1-0-1",
"V0-9-3",
"V0-9-2",
"V0-9-1",
"V0-9-0",
"V0-4-5",
"V0-4-4",
"V0-4-3",
"V0-4-2",
"V0-4-1",
"V0-4-0",
"V0-3-5",
"V0-3-4",
"V0-3-3",
"V0-3-2",
"V0-3-1",
"V0-3-0",
"V0-2-19",
"V0-2-18",
"V0-2-17",
"V0-2-15",
"V0-2-10",
"V-0-2-8",
"V0-2-6",
"V0-2-0",
"V0-1-0",
"V0-0-0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-0495.json"
}
},
{
"ranges": [
{
"repo": "https://github.com/gpg/libgcrypt",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "ff8f7e53ce6b8a5681667595c6287323652ae157"
},
{
"introduced": "850aca744eeda5fd410f478a0778e353045ac962"
},
{
"fixed": "5600d2d6b23640b0114655214f18959ee81fe58e"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:gnupg:libgcrypt:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "1.7.10"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:gnupg:libgcrypt:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "1.8.0"
},
{
"fixed": "1.8.3"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"libgcrypt-1.8.2",
"libgcrypt-1.7.9",
"libgcrypt-1.8.1",
"libgcrypt-1.8.0",
"libgcrypt-1.7.8",
"libgcrypt-1.7.7",
"libgcrypt-1.7.6",
"libgcrypt-1.7.5",
"libgcrypt-1.7.4",
"libgcrypt-1.7.3",
"libgcrypt-1.7.2",
"libgcrypt-1.7.1",
"libgcrypt-1.7.0",
"libgcrypt-1.6.0",
"libgcrypt-1.5.0",
"libgcrypt-1.5.0-beta1",
"post-nuke-of-trailing-ws",
"ecc-integration-done",
"libgcrypt-1.4.4",
"libgcrypt-1.4.3",
"libgcrypt-1.4.2",
"libgcrypt-1.4.2rc2",
"libgcrypt-1.4.2rc1",
"libgcrypt-1.4.1",
"libgcrypt-1.4.1rc1",
"libgcrypt-1.4.0",
"libgcrypt-1.3.2",
"libgcrypt-1.3.1",
"libgcrypt-1.3.0",
"V1-2-1",
"V1-2-0",
"V1-1-94",
"marcus-after-thread-cbs",
"marcus-before-thread-cbs",
"V1-1-93",
"V1-1-92",
"V1-1-91",
"V1-1-90",
"V1-1-44",
"V1-1-43",
"V1-1-42",
"V1-1-12",
"V1-1-11",
"V1-1-10",
"V1-1-9",
"V1-1-8",
"V1-1-7",
"now-less-freedom-protected",
"last-gpl-version",
"V1-1-6",
"V1-1-5",
"V1-1-4",
"V1-1-3",
"V1-1-2",
"V1-1-0",
"DEVEL-BRANCH-1-1",
"V1-0-0",
"V0-9-11",
"V0-9-10",
"V0-9-9",
"V0-9-8",
"V0-9-7",
"V0-9-6",
"V0-9-5",
"V0-9-4",
"V1-0-4",
"V1-0-3",
"V1-0-2",
"V1-0-1-ePit-1",
"V1-0-1",
"V0-9-3",
"V0-9-2",
"V0-9-1",
"V0-9-0",
"V0-4-5",
"V0-4-4",
"V0-4-3",
"V0-4-2",
"V0-4-1",
"V0-4-0",
"V0-3-5",
"V0-3-4",
"V0-3-3",
"V0-3-2",
"V0-3-1",
"V0-3-0",
"V0-2-19",
"V0-2-18",
"V0-2-17",
"V0-2-15",
"V0-2-10",
"V-0-2-8",
"V0-2-6",
"V0-2-0",
"V0-1-0",
"V0-0-0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-0495.json"
}
}
],
"modified": "2026-10-24T10:30:26.367982030Z",
"provider": "osv",
"references": [
"https://cert-portal.siemens.com/productcert/html/ssa-398330.html",
"https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=9010d1576e278a4274ad3f4aa15776c28f6ba965",
"https://access.redhat.com/errata/RHSA-2018:3221",
"https://access.redhat.com/errata/RHSA-2018:3505",
"https://access.redhat.com/errata/RHSA-2019:1296",
"https://access.redhat.com/errata/RHSA-2019:1297",
"https://access.redhat.com/errata/RHSA-2019:1543",
"https://access.redhat.com/errata/RHSA-2019:2237",
"https://lists.debian.org/debian-lts-announce/2018/06/msg00013.html",
"https://lists.gnupg.org/pipermail/gnupg-announce/2018q2/000426.html",
"https://usn.ubuntu.com/3689-1/",
"https://usn.ubuntu.com/3689-2/",
"https://usn.ubuntu.com/3692-1/",
"https://usn.ubuntu.com/3692-2/",
"https://usn.ubuntu.com/3850-1/",
"https://usn.ubuntu.com/3850-2/",
"https://www.debian.org/security/2018/dsa-4231",
"https://dev.gnupg.org/T4011",
"https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html",
"https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
{
"introduced": "12.04"
},
{
"last_affected": "12.04"
},
{
"introduced": "14.04"
},
{
"last_affected": "14.04"
},
{
"introduced": "16.04"
},
{
"last_affected": "16.04"
},
{
"introduced": "17.10"
},
{
"last_affected": "17.10"
},
{
"introduced": "18.04"
},
{
"last_affected": "18.04"
},
{
"introduced": "18.10"
},
{
"last_affected": "18.10"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*",
"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "8.0"
},
{
"last_affected": "8.0"
},
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:oracle:traffic_director:11.1.1.9.0:*:*:*:*:*:*:*"
],
"vendor_product": "oracle:traffic_director",
"extracted_events": [
{
"range": [
{
"introduced": "11.1.1.9.0"
},
{
"last_affected": "11.1.1.9.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:redhat:ansible_tower:3.3:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:ansible_tower",
"extracted_events": [
{
"range": [
{
"introduced": "3.3"
},
{
"last_affected": "3.3"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux_desktop",
"extracted_events": [
{
"range": [
{
"introduced": "7.0"
},
{
"last_affected": "7.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux_server",
"extracted_events": [
{
"range": [
{
"introduced": "7.0"
},
{
"last_affected": "7.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux_workstation",
"extracted_events": [
{
"range": [
{
"introduced": "7.0"
},
{
"last_affected": "7.0"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2018-0495",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 431601,
"published_at": "2018-06-13T23:29:00.333+00:00"
}