Medium
Security advisory
wolfcrypt/src/ecc.c in wolfSSL before 3.15.1.patch allows a memory-cache side-channel attack on ECDSA signatures, 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-2018-12436
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:32 UTC · Revision 1
Source evidence
wolfcrypt/src/ecc.c in wolfSSL before 3.15.1.patch allows a memory-cache side-channel attack on ECDSA signatures, 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-2018-12436
Complete source record
{
"id": "464e94bc14059bf610121148cfbf0a6879c2aec8c6465f8638d729bb0ad4220c",
"url": "https://osv.dev/vulnerability/CVE-2018-12436",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2018-12436",
"summary": "wolfcrypt/src/ecc.c in wolfSSL before 3.15.1.patch allows a memory-cache side-channel attack on ECDSA signatures, 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-2018-12436",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2018-12436",
"aliases": [
"CVE-2018-12436"
],
"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": "https://github.com/wolfssl/wolfssl",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "1179969dcf81e1e44fd35e387febd4f8ca38d85d"
},
{
"fixed": "9b9568d500f31f964af26ba8d01e542e1f27e5ca"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "3.15.3"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "9b9568d500f31f964af26ba8d01e542e1f27e5ca"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"v3.15.0-stable",
"v3.14.4",
"v3.14.2",
"v3.14.0b",
"v3.14.0a",
"v3.14.0-stable",
"v3.13.3",
"v3.13.2",
"v3.13.0-stable",
"v3.12.2-stable",
"v3.12.0-stable",
"v3.11.1-tls13-beta",
"v3.11.0-stable",
"v3.10.3",
"v3.10.2-stable",
"v3.10.0a",
"v3.10.0-stable",
"v3.9.10b",
"v3.9.10-stable",
"v3.9.8",
"v3.9.6w",
"v3.9.6",
"v3.9.1",
"v3.9.0",
"v3.8.0",
"v3.7.3",
"v3.7.1",
"v3.7.0",
"v3.6.9",
"v3.6.8",
"v3.4.6",
"v3.4.2",
"v3.4.0",
"v3.3.3",
"v3.3.0",
"v3.2.6",
"v3.2.4",
"v3.2.0",
"v2.9.4",
"v2.9.2",
"v2.9.1",
"v0.5",
"v2.9.0",
"v2.8.6",
"v2.8.5a",
"v2.8.5",
"v2.8.4",
"v2.8.3",
"v2.8.2",
"v2.8.0",
"v2.7.2",
"v2.7.0",
"v2.6.2",
"v2.6.0",
"v2.4.7",
"v2.4.6",
"v2.4.2",
"v2.0.8",
"v2.0.6",
"v2.0.3",
"v2.0.2",
"v2.0rc3",
"v2.0rc2b",
"v2.0rc2",
"v2.0rc1",
"v1.9.0",
"v1.8.8.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-12436.json",
"vanir_signatures": [
{
"id": "CVE-2018-12436-03e5e19c",
"digest": {
"length": 798,
"function_hash": "97098694070618479796839824861712676912"
},
"source": "https://github.com/wolfssl/wolfssl/commit/9b9568d500f31f964af26ba8d01e542e1f27e5ca",
"target": {
"file": "wolfcrypt/src/ecc.c",
"function": "wc_ecc_gen_k"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2018-12436-7d2e4743",
"digest": {
"length": 6073,
"function_hash": "329601971156733586894920632165393768916"
},
"source": "https://github.com/wolfssl/wolfssl/commit/9b9568d500f31f964af26ba8d01e542e1f27e5ca",
"target": {
"file": "wolfcrypt/src/ecc.c",
"function": "wc_ecc_sign_hash_ex"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2018-12436-9be8702e",
"digest": {
"threshold": 0.9,
"line_hashes": [
"180105540832317960135869179642485368458",
"219670112345521747196662040631326145700",
"16111731207495186350516201396152731575",
"84580058371629366077470150564612674802",
"338280410321397857655128996363835051309",
"275739291280294658398206417064560146914",
"43222418277609380264329009969200061082",
"281911540114982861058971188872665423747",
"120207583837105358401042174516439733029",
"35144380420131484861593369048590002852",
"287111173886096549423603016843712953966",
"224969320601590970213067024922785565873",
"116541833046167184336218681229605942449",
"297537371672909726796839019846523928632",
"30414633575863347317212229842143138176",
"139116827036489476815642640892002953346",
"141218504163137182235295909753019846141",
"18542260038182372672688065707602259741",
"164561830877312627579682711805580772728",
"75202648303631630100611227098050061419",
"227368077280084628061074102065322406230",
"319585949210892297687748878719963247398",
"101638936496678138146601086666856366866",
"210294045997350206660528821359663780294",
"169857514239109531428198600871698928543",
"194089326328324240590752388381939524044",
"216345207333688073353394951787849222414",
"157954063479739293112728240484396121451",
"6030899692141079888304492776418959104",
"238170310874901192081407911422618976324",
"11404882872460344036499629001227805627",
"303394133142596662493052787285145781651",
"170803551361033665570430574072960793399",
"293702046138194098313276599765382829765",
"161964254929860119880494294595042289820",
"113536867443714089690266207735977194456",
"331957245513875143663211821403297561902",
"1047273769436126680075077787862867170",
"99632092121648833459388601988131629043",
"237104132855061567602291230687355861176",
"229257314256408985491156933656895597416",
"280275082197584052408944518295226672803",
"275684663132770170878378752916701360836"
]
},
"source": "https://github.com/wolfssl/wolfssl/commit/9b9568d500f31f964af26ba8d01e542e1f27e5ca",
"target": {
"file": "wolfcrypt/src/ecc.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-20T13:46:33Z"
}
}
],
"modified": "2026-10-20T13:46:33.131946557Z",
"provider": "osv",
"references": [
"https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/",
"https://www.wolfssl.com/wolfssh-and-rohnp/",
"https://github.com/wolfSSL/wolfssl/commit/9b9568d500f31f964af26ba8d01e542e1f27e5ca"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2018-12436",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 388221,
"published_at": "2018-06-15T02:29:00.423+00:00"
}