CWE
287
Advisory Published
CVE Published
Updated

CVE-2019-17023

First published: Tue Jan 07 2020(Updated: )

A protocol downgrade flaw was found in Network Security Services (NSS). After a HelloRetryRequest has been sent, the client may negotiate a lower protocol than 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.

Credit: security@mozilla.org security@mozilla.org

Affected SoftwareAffected VersionHow to fix
redhat/nspr<0:4.25.0-2.el7_9
0:4.25.0-2.el7_9
redhat/nss<0:3.53.1-3.el7_9
0:3.53.1-3.el7_9
redhat/nss-softokn<0:3.53.1-6.el7_9
0:3.53.1-6.el7_9
redhat/nss-util<0:3.53.1-1.el7_9
0:3.53.1-1.el7_9
redhat/nspr<0:4.25.0-2.el8_2
0:4.25.0-2.el8_2
redhat/nss<0:3.53.1-11.el8_2
0:3.53.1-11.el8_2
redhat/nss<3.49
3.49
Mozilla Firefox<72
72
Mozilla Firefox<72.0
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=19.04
Canonical Ubuntu Linux=19.10
Canonical Ubuntu Linux=20.04
Debian Debian Linux=10.0
debian/firefox
133.0.3-1
debian/nss
2:3.61-1+deb11u3
2:3.61-1+deb11u4
2:3.87.1-1
2:3.87.1-1+deb12u1
2:3.106-1
IBM Cognos Analytics<=12.0.0-12.0.3
IBM Cognos Analytics<=11.2.0-11.2.4 FP4

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Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2019-17023?

    CVE-2019-17023 is a protocol downgrade vulnerability in Network Security Services (NSS) that allows for an invalid state transition in the TLS State Machine.

  • Which software is affected by CVE-2019-17023?

    Mozilla Firefox versions up to 72 and Red Hat packages nss, nspr, nss-softokn, and nss-util versions up to 3.49, 4.25.0-2.el7_9, 3.53.1-3.el7_9, 3.53.1-6.el7_9, 3.53.1-1.el7_9, 4.25.0-2.el8_2, and 3.53.1-11.el8_2 are affected.

  • What is the severity of CVE-2019-17023?

    CVE-2019-17023 has a severity rating of 5.3 (medium).

  • How can I fix CVE-2019-17023?

    To fix CVE-2019-17023, update Mozilla Firefox to version 72 or later, and update the affected Red Hat packages (nss, nspr, nss-softokn, nss-util) to versions 3.49, 4.25.0-2.el7_9, 3.53.1-3.el7_9, 3.53.1-6.el7_9, 3.53.1-1.el7_9, 4.25.0-2.el8_2, or 3.53.1-11.el8_2 or later.

  • Where can I find more information about CVE-2019-17023?

    You can find more information about CVE-2019-17023 on the Mozilla Bugzilla page at https://bugzilla.mozilla.org/show_bug.cgi?id=CVE-2019-17023.

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