Is CVE-2019-11743 in the CISA KEV catalog?

No. CVE-2019-11743 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-11743?

CVE-2019-11743 has a CVSS v3 base score of 3.7 (LOW).

What is the EPSS score for CVE-2019-11743?

CVE-2019-11743 has an EPSS score of 1.80% (76th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-11743?

Upgrade firefox on debian unstable to 69.0-1 or later. Fixes are available for 7 affected products.

CVE & CISA-KEV Catalog

CVE-2019-11743

LOWEPSS 76th pctl

3.7

CVSS v3

NVD

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.

CWE-203

How to fix

Remediation Available

firefoxDebian

Fixed in:69.0-1CVE-2019-11743

firefoxUbuntu

Fixed in:69.0+build2-0ubuntu0.16.04.4USN-4122-1

Fixed in:69.0+build2-0ubuntu0.18.04.1USN-4122-1

thunderbirdUbuntu

Fixed in:1:60.9.0+build1-0ubuntu0.16.04.2USN-4150-1

Fixed in:1:60.9.0+build1-0ubuntu0.18.04.1USN-4150-1

DeveloperEditionWindows application

Affected:60.9.0Fixed in:60.9.0Mozilla

Affected:69.0Fixed in:69.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:60.9.0Fixed in:60.9.0Mozilla

Affected:69.0Fixed in:69.0Mozilla

Mozilla Firefox ESR (en-US)Windows application

Affected:68.0 68.1.0Fixed in:68.1.0Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:60.9.0Fixed in:60.9.0Mozilla

Affected:68.0 68.1.0Fixed in:68.1.0Mozilla

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

1.80%probability of exploitation in 30 days

76thpercentile

Elevated risk: more likely to be exploited than 76% of all known CVEs.

References

Exploit1

w3c.github.io

Vendor Advisory6

Other references6

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-25.