CVE-2019-17021

Name: CVE-2019-17021
Creator: NVD / NIST
Published: 2020-01-08T22:15:12.653+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.87%

Last modified Jun 17, 2026

CVE-2019-17021 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. During the initialization of a new content process, a race condition occurs that can allow a content process to disclose heap addresses from the parent process. *Note: this issue only occurs on Windows. EPSS estimates a 1.87% chance of exploitation in the next 30 days.

Description

During the initialization of a new content process, a race condition occurs that can allow a content process to disclose heap addresses from the parent process. *Note: this issue only occurs on Windows. Other operating systems are unaffected.*. This vulnerability affects Firefox ESR < 68.4 and Firefox < 72.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

EPSS Probability

1.87%

76.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-362

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 72.0
Mozilla	Firefox Esr	< 68.4
Opensuse	Leap	15.1

References

http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00029.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00043.htmlMailing List, Third Party Advisory
http://packetstormsecurity.com/files/155912/Slackware-Security-Advisory-mozilla-thunderbird-Updates.htmlExploit, Third Party Advisory, VDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1599008Exploit, Issue Tracking, Permissions Required
https://seclists.org/bugtraq/2020/Jan/18Mailing List, Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-01/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-02/Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00029.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00043.htmlMailing List, Third Party Advisory
http://packetstormsecurity.com/files/155912/Slackware-Security-Advisory-mozilla-thunderbird-Updates.htmlExploit, Third Party Advisory, VDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1599008Exploit, Issue Tracking, Permissions Required
https://seclists.org/bugtraq/2020/Jan/18Mailing List, Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-01/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-02/Vendor Advisory

Timeline

Published: Jan 8, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-17021?

How severe is CVE-2019-17021?

CVE-2019-17021 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.87% probability of exploitation in the next 30 days.

How do I fix CVE-2019-17021?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-17021?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST