Medium
Security advisory
In GNOME glib-networking through 2.64.2, the implementation of GTlsClientConnection skips hostname verification of the server's TLS certificate if the application fails to specify the expected server identity. This is in contrast to its intended documented behavior, to fail the certificate verification. Applications that fail to provide the server identity, including Balsa before 2.5.11 and 2.6.x before 2.6.1, accept a TLS certificate if the certificate is valid for any host.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-13645
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:26 UTC · Revision 1
Source evidence
In GNOME glib-networking through 2.64.2, the implementation of GTlsClientConnection skips hostname verification of the server's TLS certificate if the application fails to specify the expected server identity. This is in contrast to its intended documented behavior, to fail the certificate verification. Applications that fail to provide the server identity, including Balsa before 2.5.11 and 2.6.x before 2.6.1, accept a TLS certificate if the certificate is valid for any host.
osv:CVE-2020-13645
Complete source record
{
"id": "a2c336b1cb320b5ef82e280f6f3b098aa0f11243dd0943aa3acc847ecc4c0633",
"url": "https://osv.dev/vulnerability/CVE-2020-13645",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-13645",
"summary": "In GNOME glib-networking through 2.64.2, the implementation of GTlsClientConnection skips hostname verification of the server's TLS certificate if the application fails to specify the expected server identity. This is in contrast to its intended documented behavior, to fail the certificate verification. Applications that fail to provide the server identity, including Balsa before 2.5.11 and 2.6.x before 2.6.1, accept a TLS certificate if the certificate is valid for any host.",
"evidence": "osv:CVE-2020-13645",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2020-13645",
"aliases": [
"CVE-2020-13645"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/gnome/glib-networking",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "6708b357c59d7655f10d7b69c194178c9ccc447f"
},
{
"introduced": "c8a3134693712055d4bff35ca18bf936e3f0df07"
},
{
"fixed": "533d3a76e2cc622b072e3ec789f69e888f3fd8eb"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:gnome:glib-networking:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2.62.4"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:gnome:glib-networking:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.64.0"
},
{
"fixed": "2.64.3"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"2.64.2",
"2.64.1",
"2.64.0",
"2.62.3",
"2.62.2",
"2.62.1",
"2.62.0",
"2.61.92",
"2.61.90",
"2.61.2",
"2.61.1",
"2.60.2",
"2.60.1",
"2.60.0.1",
"2.60.0",
"2.59.92",
"2.59.91",
"2.59.90",
"2.59.2",
"2.59.1",
"2.58.0",
"2.57.92",
"2.57.90",
"2.57.3",
"2.57.2",
"2.57.1",
"2.55.90",
"2.55.2",
"2.55.1",
"2.54.0",
"2.53.90",
"2.50.0",
"2.49.90",
"2.48.2",
"2.48.1",
"2.48.0",
"2.47.1",
"2.46.0",
"2.45.1",
"2.44.0",
"2.43.92",
"2.43.91",
"2.43.1",
"2.42.0",
"2.41.92",
"2.41.4",
"2.41.3",
"2.40.0",
"2.39.90",
"2.39.3",
"2.39.1",
"2.38.1",
"2.38.0",
"2.37.5",
"2.37.4",
"2.37.2",
"2.37.1",
"2.36.0",
"2.35.9",
"2.35.8",
"2.35.6",
"2.35.4",
"2.35.3",
"2.34",
"2.35.1",
"2.33.14.1",
"2.33.14",
"2.33.12",
"2.33.10",
"glib-2.33.3",
"2.32.1",
"2.33.2",
"2.32.0",
"2.31.22",
"2.31.20",
"2.31.16",
"2.31.6",
"2.31.2",
"2.31.0",
"2.29.92",
"2.29.18",
"2.29.15",
"2.29.9",
"2.28.6",
"2.28.5",
"2.28.4",
"2.28.0",
"2.27.90",
"2.27.5",
"2.27.4",
"2.26.0",
"2.25.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-13645.json"
}
},
{
"ranges": [
{
"repo": "https://gitlab.gnome.org/gnome/balsa",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "f07d097cfef79f993b38c62870fd32f27f0d15a2"
},
{
"introduced": "f88ed9be84d182668e809c6f06d733b5d288f302"
},
{
"last_affected": "f88ed9be84d182668e809c6f06d733b5d288f302"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:gnome:balsa:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2.5.11"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:gnome:balsa:2.6.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.6.0"
},
{
"last_affected": "2.6.0"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
"2.6.0",
"2.5.10",
"2.5.9",
"2.5.8",
"2.5.7a",
"2.5.6",
"2.5.5",
"2.5.4",
"2.5.3a",
"BALSA_2_3_26",
"BALSA_2_3_24",
"BALSA_2_3_20",
"BALSA_2_3_19",
"BALSA_2_3_15",
"BALSA_2_3_13",
"BALSA_2_3_12",
"BALSA_2_3_10",
"BALSA_2_3_8",
"BALSA_2_3_7",
"BALSA_2_3_5",
"BALSA_2_3_4",
"BALSA_2_3_3",
"BALSA_2_3_2",
"BALSA_2_3_1",
"BALSA_2_3_0",
"BALSA_2_2_6",
"BALSA_2_2_5",
"BALSA_2_2_4",
"BALSA_2_2_2",
"BALSA_2_2_1",
"BALSA_2_1_91",
"BALSA_2_1_3",
"BALSA_2_1_2",
"BALSA_2_1_1",
"BALSA_2_0_13",
"BALSA_2_0_8",
"BALSA_2_0_9",
"before-new-toolbars",
"BALSA_1_4_1",
"BALSA_1_4_0",
"BALSA_1_3_6",
"BALSA_1_3_5",
"BALSA_1_3_4",
"BALSA_1_3_3",
"BALSA_1_3_0",
"BALSA_1_2_2",
"BALSA_1_2_0",
"BALSA_1_2_pre2",
"BALSA_1_1_7",
"GNOME_MEDIA_1_2_2",
"BALSA_1_1_4",
"BALSA_1_1_2",
"BALSA_1_1_1",
"BALSA_1_1_0",
"BALSA_1_0_0",
"GNOME_PRINT_0_24",
"balsa-0-9-5",
"dev_0_9_1",
"initial-BALSA-CONFIG",
"balsa-0-8",
"balsa-0_6_0",
"WITHXMHTML",
"GNOME0",
"release_tag"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-13645.json"
}
}
],
"modified": "2026-10-24T10:47:27.222788308Z",
"provider": "osv",
"references": [
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HLEX2IP62SU6WJ4SK3U766XGLQK3J62O/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LRCUM22YEWWKNMN2BP5LTVDM5P4VWIXS/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TQEQJQ4XFMFCFJTEXKL2ZO3UELBPCKSK/",
"https://security.gentoo.org/glsa/202007-50",
"https://security.netapp.com/advisory/ntap-20200608-0004/",
"https://usn.ubuntu.com/4405-1/",
"https://gitlab.gnome.org/GNOME/balsa/-/issues/34",
"https://gitlab.gnome.org/GNOME/glib-networking/-/issues/135"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
{
"introduced": "16.04"
},
{
"last_affected": "16.04"
},
{
"introduced": "18.04"
},
{
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},
{
"introduced": "19.10"
},
{
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},
{
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},
{
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}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
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"cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "31"
},
{
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},
{
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},
{
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}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2020-13645",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 441230,
"published_at": "2020-05-28T12:15:11.173+00:00"
}