CVE-2019-11743

Name: CVE-2019-11743
Creator: NVD / NIST
Published: 2019-09-27T18:15:12.037+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 3.7/10EPSS 1.80%

Last modified Jun 17, 2026

CVE-2019-11743 is a low-severity vulnerability rated 3.7/10 on the CVSS scale. Navigation events were not fully adhering to the W3C's "Navigation-Timing Level 2" draft specification in some instances for the unload event, which restricts access to detailed timing attributes to only be same-origin. This resulted in potential cross-origin information exposure of history through timing side-channel attacks. EPSS estimates a 1.80% chance of exploitation in the next 30 days.

Description

Navigation events were not fully adhering to the W3C's "Navigation-Timing Level 2" draft specification in some instances for the unload event, which restricts access to detailed timing attributes to only be same-origin. This resulted in potential cross-origin information exposure of history through timing side-channel attacks. This vulnerability affects Firefox < 69, Thunderbird < 68.1, Thunderbird < 60.9, Firefox ESR < 60.9, and Firefox ESR < 68.1.

Metrics

CVSS 3.1

3.7/10

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

EPSS Probability

1.80%

75.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-203

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 60.9.0
Mozilla	Firefox	< 69.0
Mozilla	Firefox Esr	>= 68.0, < 68.1.0
Mozilla	Thunderbird	< 60.9.0
Mozilla	Thunderbird	>= 68.0, < 68.1.0

References

http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html
https://bugzilla.mozilla.org/show_bug.cgi?id=1560495Issue Tracking, Permissions Required, Vendor Advisory
https://security.gentoo.org/glsa/201911-07
https://usn.ubuntu.com/4150-1/
https://w3c.github.io/navigation-timingExploit, Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2019-25/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-26/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-27/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-29/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-30/Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html
https://bugzilla.mozilla.org/show_bug.cgi?id=1560495Issue Tracking, Permissions Required, Vendor Advisory
https://security.gentoo.org/glsa/201911-07
https://usn.ubuntu.com/4150-1/
https://w3c.github.io/navigation-timingExploit, Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2019-25/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-26/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-27/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-29/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-30/Vendor Advisory

Timeline

Published: Sep 27, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-11743?

How severe is CVE-2019-11743?

CVE-2019-11743 has a CVSS score of 3.7/10 (LOW severity). The EPSS model estimates a 1.80% probability of exploitation in the next 30 days.

How do I fix CVE-2019-11743?

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-2019-11743?

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

Scan your code now

Source: NVD / NIST