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Vulnerability details: VCID-sm4b-5vw1-1qcf
Vulnerability ID VCID-sm4b-5vw1-1qcf
Aliases CVE-2019-17023
Summary After a HelloRetryRequest has been sent, the client may negotiate a lower protocol that TLS 1.3, resulting in an invalid state transition in the TLS State Machine. If the client gets into this state, incoming Application Data records will be ignored.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-287 Improper Authentication
System Score Found at
cvssv3 5.3 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-17023.json
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2019-17023
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2019-17023
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2019-17023
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2019-17023
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2019-17023
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2019-17023
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2019-17023
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2019-17023
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2019-17023
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2019-17023
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2019-17023
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2019-17023
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2019-17023
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2019-17023
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2019-17023
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2019-17023
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2019-17023
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2019-17023
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2019-17023
archlinux Critical https://security.archlinux.org/AVG-1084
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-01
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-17023.json
https://api.first.org/data/v1/epss?cve=CVE-2019-17023
https://bugzilla.mozilla.org/show_bug.cgi?id=1590001
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-17006
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-17023
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12399
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12402
https://www.debian.org/security/2020/dsa-4726
https://www.mozilla.org/security/advisories/mfsa2020-01/
1791225 https://bugzilla.redhat.com/show_bug.cgi?id=1791225
ASA-202001-1 https://security.archlinux.org/ASA-202001-1
AVG-1084 https://security.archlinux.org/AVG-1084
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
CVE-2019-17023 https://nvd.nist.gov/vuln/detail/CVE-2019-17023
mfsa2020-01 https://www.mozilla.org/en-US/security/advisories/mfsa2020-01
RHSA-2020:3280 https://access.redhat.com/errata/RHSA-2020:3280
RHSA-2020:4076 https://access.redhat.com/errata/RHSA-2020:4076
RHSA-2021:0949 https://access.redhat.com/errata/RHSA-2021:0949
USN-4234-1 https://usn.ubuntu.com/4234-1/
USN-4397-1 https://usn.ubuntu.com/4397-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-17023.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2019-17023
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2019-17023
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.38367
EPSS Score 0.00166
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:40.214219+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2020/mfsa2020-01.yml 37.0.0