wolfssl — security advisory
wolfSSL SP Math All RSA implementation is vulnerable to the Marvin Attack, new variation of a timing Bleichenbacher style attack, when built with the following options to configure: --enable-all CFLAGS="-DWOLFSSL_STATIC_RSA" The define “WOLFSSL_STATIC_RSA” enables static RSA cipher suites, which is not recommended, and has been disabled by default since wolfSSL 3.6.6. Therefore the default build since 3.6.6, even with "--enable-all", is not vulnerable to the Marvin Attack. The vulnerability is specific to static RSA cipher suites, and expected to be padding-independent. The vulnerability allows an attacker to decrypt ciphertexts and forge signatures after probing with a large number of test observations. However the server’s private key is not exposed.
- Products
- wolfssl
- Affected versions
- 5.5.4-2, 5.5.4-2+deb12u1, 5.5.4-2+deb12u2, 5.5.4-2+deb12u3, 5.5.4-2.1, 5.6.4-1, 5.6.4-2, 5.6.6-1, 5.6.6-1.1, 5.6.6-1.2, 5.6.6-1.3, 5.6.6-1.3~exp1, 5.7.0-0.1, 5.7.0-0.2, 5.7.0-0.3, 5.7.2-0.1, 5.7.2-0.2, 5.7.2-0.3, 5.7.2-0.4, 5.8.2-1, 5.8.2-1.1, 5.8.2-1.2, 5.8.4-1, 5.9.0-0.1, 5.9.0-0.2, 5.9.1-0.1, 5.9.2-1, 5.9.2-1.1, 5.9.2-1.2
- Fixed versions
- 5.6.6-1.2
- CVEs
- CVE-2023-6935
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 16:09 UTC · Revision 1
Source evidence
wolfSSL SP Math All RSA implementation is vulnerable to the Marvin Attack, new variation of a timing Bleichenbacher style attack, when built with the following options to configure: --enable-all CFLAGS="-DWOLFSSL_STATIC_RSA" The define “WOLFSSL_STATIC_RSA” enables static RSA cipher suites, which is not recommended, and has been disabled by default since wolfSSL 3.6.6. Therefore the default build since 3.6.6, even with "--enable-all", is not vulnerable to the Marvin Attack. The vulnerability is specific to static RSA cipher suites, and expected to be padding-independent. The vulnerability allows an attacker to decrypt ciphertexts and forge signatures after probing with a large number of test observations. However the server’s private key is not exposed.
osv:DEBIAN-CVE-2023-6935
wolfssl
Fixed versions: Not specified
wolfssl
Fixed versions: 5.6.6-1.2
Complete source record
{
"id": "985e6e6bfc801d071b492f04870638265a18b11310e40f91bfb3a5f9a452c3fe",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2023-6935",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2023-6935",
"summary": "wolfSSL SP Math All RSA implementation is vulnerable to the Marvin Attack, new variation of a timing Bleichenbacher style attack, when built with the following options to configure: --enable-all CFLAGS=\"-DWOLFSSL_STATIC_RSA\" The define “WOLFSSL_STATIC_RSA” enables static RSA cipher suites, which is not recommended, and has been disabled by default since wolfSSL 3.6.6. Therefore the default build since 3.6.6, even with \"--enable-all\", is not vulnerable to the Marvin Attack. The vulnerability is specific to static RSA cipher suites, and expected to be padding-independent. The vulnerability allows an attacker to decrypt ciphertexts and forge signatures after probing with a large number of test observations. However the server’s private key is not exposed.",
"evidence": "osv:DEBIAN-CVE-2023-6935",
"products": [
{
"name": {
"value": "wolfssl",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.5.4-2",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
"value": "5.5.4-2+deb12u3",
"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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{
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"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
"value": "5.6.6-1.3",
"evidence": "/affected/0/versions"
},
{
"value": "5.6.6-1.3~exp1",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
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{
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
},
{
"value": "5.7.2-0.4",
"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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{
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
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]
},
{
"name": {
"value": "wolfssl",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "5.6.6-1.2",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2023-6935",
"aliases": [
"DEBIAN-CVE-2023-6935"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"
}
],
"affected": [
{
"ranges": [
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"type": "ECOSYSTEM",
"events": [
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],
"package": {
"name": "wolfssl",
"purl": "pkg:deb/debian/wolfssl?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
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"5.5.4-2+deb12u1",
"5.5.4-2+deb12u2",
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"5.5.4-2.1",
"5.6.4-1",
"5.6.4-2",
"5.6.6-1",
"5.6.6-1.1",
"5.6.6-1.2",
"5.6.6-1.3",
"5.6.6-1.3~exp1",
"5.7.0-0.1",
"5.7.0-0.2",
"5.7.0-0.3",
"5.7.2-0.1",
"5.7.2-0.2",
"5.7.2-0.3",
"5.7.2-0.4",
"5.8.2-1",
"5.8.2-1.1",
"5.8.2-1.2",
"5.8.4-1",
"5.9.0-0.1",
"5.9.0-0.2",
"5.9.1-0.1",
"5.9.2-1",
"5.9.2-1.1",
"5.9.2-1.2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-6935.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "5.6.6-1.2"
}
]
}
],
"package": {
"name": "wolfssl",
"purl": "pkg:deb/debian/wolfssl?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-6935.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
}
],
"modified": "2026-10-26T18:02:47.482411112Z",
"provider": "osv",
"upstream": [
"CVE-2023-6935"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2023-6935"
]
},
"related_cves": [
{
"value": "CVE-2023-6935",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 456853,
"published_at": "2024-02-09T23:15:08.03+00:00"
}