Critical
Security advisory
An issue was discovered in openfortivpn 1.11.0 when used with OpenSSL before 1.0.2. tunnel.c mishandles certificate validation because hostname comparisons do not consider '\0' characters, as demonstrated by a good.example.com\x00evil.example.com attack.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-7043
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:36 UTC · Revision 1
Source evidence
An issue was discovered in openfortivpn 1.11.0 when used with OpenSSL before 1.0.2. tunnel.c mishandles certificate validation because hostname comparisons do not consider '\0' characters, as demonstrated by a good.example.com\x00evil.example.com attack.
osv:CVE-2020-7043
Complete source record
{
"id": "6e26debfe1c53984b7b2a34cd943c7a34bb77534514f4ba6beb21198ef3fbeb3",
"url": "https://osv.dev/vulnerability/CVE-2020-7043",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-7043",
"summary": "An issue was discovered in openfortivpn 1.11.0 when used with OpenSSL before 1.0.2. tunnel.c mishandles certificate validation because hostname comparisons do not consider '\\0' characters, as demonstrated by a good.example.com\\x00evil.example.com attack.",
"evidence": "osv:CVE-2020-7043",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2020-7043",
"aliases": [
"CVE-2020-7043"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/adrienverge/openfortivpn",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "cd9368c6a1b4ef91d77bb3fdbe2e5bc34aa6f4c4"
},
{
"fixed": "6328a070ddaab16faaf008cb9a8a62439c30f2a8"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:openfortivpn_project:openfortivpn:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "1.12.0"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "6328a070ddaab16faaf008cb9a8a62439c30f2a8"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "cd9368c6a1b4ef91d77bb3fdbe2e5bc34aa6f4c4"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"v1.11.0",
"v1.10.0",
"v1.9.0",
"v1.8.1",
"v1.8.0",
"v1.7.1",
"v1.7.0",
"v1.6.0",
"v1.5.0",
"v1.4.0",
"v1.3.1",
"v1.3.0",
"v1.2.0",
"v1.1.4",
"v1.1.3",
"v1.1.2",
"v1.1.1",
"v1.1.0",
"v1.0.1",
"v1.0.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-7043.json",
"vanir_signatures": [
{
"id": "CVE-2020-7043-2f760f54",
"digest": {
"length": 2429,
"function_hash": "125432945444897325704174321387259565829"
},
"source": "https://github.com/adrienverge/openfortivpn/commit/6328a070ddaab16faaf008cb9a8a62439c30f2a8",
"target": {
"file": "src/tunnel.c",
"function": "ssl_verify_cert"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2020-7043-63a1b135",
"digest": {
"threshold": 0.9,
"line_hashes": [
"326536668639958100052841729794042126996",
"123601388663251602674058961315617262532",
"298499906374837506832731988873827737561",
"333538535266810693348442609398214357092",
"222499057199839917237616048434638310995",
"158021963753876568126672681529555774435",
"3117077068216323258710621602857852384",
"210886845709506199277846659849797683834",
"247627447578623611675946358640487877531",
"229416393064689430651692213890800657889",
"78461889246657476217910916720647705158",
"8031173947055631212742603957353263086",
"19935018114004311826440147295255170225"
]
},
"source": "https://github.com/adrienverge/openfortivpn/commit/6328a070ddaab16faaf008cb9a8a62439c30f2a8",
"target": {
"file": "src/tunnel.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-20T13:59:43Z"
}
}
],
"modified": "2026-10-20T13:59:43.856355555Z",
"provider": "osv",
"references": [
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CKNKSGBVYGRRVRLFEFBEKUEJYJR5LWOF/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FF6HYIBREQGATRM5COF57MRQWKOKCWZ3/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SRVVNXCNTNMPCIAZIVR4FAGYCSU53FNA/",
"https://github.com/adrienverge/openfortivpn/issues/536",
"https://github.com/adrienverge/openfortivpn/commit/6328a070ddaab16faaf008cb9a8a62439c30f2a8",
"https://github.com/adrienverge/openfortivpn/commit/cd9368c6a1b4ef91d77bb3fdbe2e5bc34aa6f4c4"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "30"
},
{
"last_affected": "30"
},
{
"introduced": "31"
},
{
"last_affected": "31"
},
{
"introduced": "32"
},
{
"last_affected": "32"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:opensuse:backports_sle:15.0:sp1:*:*:*:*:*:*"
],
"vendor_product": "opensuse:backports_sle",
"extracted_events": [
{
"range": [
{
"introduced": "15.0-sp1"
},
{
"last_affected": "15.0-sp1"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*"
],
"vendor_product": "opensuse:leap",
"extracted_events": [
{
"range": [
{
"introduced": "15.1"
},
{
"last_affected": "15.1"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2020-7043",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 388503,
"published_at": "2020-02-27T18:15:11.623+00:00"
}