Critical
Security advisory
In ARM mbed TLS before 2.7.0, there is a bounds-check bypass through an integer overflow in PSK identity parsing in the ssl_parse_client_psk_identity() function in library/ssl_srv.c.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2017-18187
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:12 UTC · Revision 1
Source evidence
In ARM mbed TLS before 2.7.0, there is a bounds-check bypass through an integer overflow in PSK identity parsing in the ssl_parse_client_psk_identity() function in library/ssl_srv.c.
osv:CVE-2017-18187
Complete source record
{
"id": "6abbdcbd93e23819fe833494d2380c451e6c2e65c342885b4709acdcfbad0495",
"url": "https://osv.dev/vulnerability/CVE-2017-18187",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2017-18187",
"summary": "In ARM mbed TLS before 2.7.0, there is a bounds-check bypass through an integer overflow in PSK identity parsing in the ssl_parse_client_psk_identity() function in library/ssl_srv.c.",
"evidence": "osv:CVE-2017-18187",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2017-18187",
"aliases": [
"CVE-2017-18187"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/Mbed-TLS/mbedtls",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "32605dc83042d737e715a685e53176388d73540e"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2.7.0"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
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"mbedtls-2.6.0",
"mbedtls-2.6.0-rc1",
"mbedtls-2.5.1",
"mbedtls-2.5.0",
"mbedtls-2.4.0",
"mbedtls-2.2.1",
"yotta-2.3.1",
"mbedtls-2.3.0",
"mbedtls-2.2.0",
"mbedos-release-15-11",
"mbedos-techcon-oob2",
"mbedtls-2.1.2",
"mbedtls-2.1.0",
"mbedtls-2.1.1",
"beta-oob-2",
"mbedtls-2.0.0",
"polarssl-1.3.9",
"polarssl-1.3.8",
"polarssl-1.3.7",
"polarssl-1.3.6",
"polarssl-1.3.5",
"polarssl-1.3.4",
"polarssl-1.3.3",
"polarssl-1.3.2",
"polarssl-1.3.1",
"polarssl-1.3.0",
"polarssl-1.3.0-rc0",
"polarssl-1.2.6",
"polarssl-1.2.5",
"polarssl-1.2.4",
"polarssl-1.2.2",
"polarssl-1.2.1",
"polarssl-1.2.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-18187.json"
}
},
{
"ranges": [
{
"repo": "https://github.com/mbed-tls/mbedtls",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "83c9f495ffe70c7dd280b41fdfd4881485a3bc28"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"fixed": "83c9f495ffe70c7dd280b41fdfd4881485a3bc28"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"mbedtls-2.5.0",
"mbedtls-2.4.0",
"mbedtls-2.2.1",
"yotta-2.3.1",
"mbedtls-2.3.0",
"mbedtls-2.2.0",
"mbedos-release-15-11",
"mbedos-techcon-oob2",
"mbedtls-2.1.2",
"mbedtls-2.1.0",
"mbedtls-2.1.1",
"beta-oob-2",
"mbedtls-2.0.0",
"polarssl-1.3.9",
"polarssl-1.3.8",
"polarssl-1.3.7",
"polarssl-1.3.6",
"polarssl-1.3.5",
"polarssl-1.3.4",
"polarssl-1.3.3",
"polarssl-1.3.2",
"polarssl-1.3.1",
"polarssl-1.3.0",
"polarssl-1.3.0-rc0",
"polarssl-1.2.6",
"polarssl-1.2.5",
"polarssl-1.2.4",
"polarssl-1.2.2",
"polarssl-1.2.1",
"polarssl-1.2.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-18187.json",
"vanir_signatures": [
{
"id": "CVE-2017-18187-2d89a41b",
"digest": {
"threshold": 0.9,
"line_hashes": [
"146705795122806448969502256052171142492",
"250739608582514144555358197331282491043",
"138311258465109895060410760846872072497",
"226521422758386904350980188820999931980",
"166683699188758028603646729933607871728",
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"179663835056930844441641430651641120248",
"26630778509266565837874525009607955193"
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},
"source": "https://github.com/mbed-tls/mbedtls/commit/83c9f495ffe70c7dd280b41fdfd4881485a3bc28",
"target": {
"file": "library/ssl_srv.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CVE-2017-18187-601b0b25",
"digest": {
"length": 1429,
"function_hash": "121718152799964170990906735473705715749"
},
"source": "https://github.com/mbed-tls/mbedtls/commit/83c9f495ffe70c7dd280b41fdfd4881485a3bc28",
"target": {
"file": "library/ssl_srv.c",
"function": "ssl_parse_client_psk_identity"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-20T13:21:17Z"
}
}
],
"modified": "2026-10-20T13:21:17.071927151Z",
"provider": "osv",
"references": [
"https://usn.ubuntu.com/4267-1/",
"https://github.com/ARMmbed/mbedtls/blob/master/ChangeLog",
"https://security.gentoo.org/glsa/201804-19",
"https://www.debian.org/security/2018/dsa-4138",
"https://www.debian.org/security/2018/dsa-4147",
"https://github.com/ARMmbed/mbedtls/commit/83c9f495ffe70c7dd280b41fdfd4881485a3bc28"
],
"provider_metadata": {
"unresolved_ranges": [
{
"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"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2017-18187",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 387557,
"published_at": "2018-02-14T17:29:00.237+00:00"
}