CVE-2014-1559

Name: CVE-2014-1559
Creator: NVD / NIST
Published: 2014-07-23T11:12:43.323+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.71%

Last modified Jun 17, 2026

CVE-2014-1559 is a vulnerability of currently unknown severity. Mozilla Firefox before 31.0 and Thunderbird before 31.0 allow remote attackers to cause a denial of service (X.509 certificate parsing outage) via a crafted certificate that does not use UTF-8 character encoding in a required context, a different vulnerability than CVE-2014-1558.. EPSS estimates a 1.71% chance of exploitation in the next 30 days.

Description

Mozilla Firefox before 31.0 and Thunderbird before 31.0 allow remote attackers to cause a denial of service (X.509 certificate parsing outage) via a crafted certificate that does not use UTF-8 character encoding in a required context, a different vulnerability than CVE-2014-1558.

Metrics

EPSS Probability

1.71%

74.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	<= 30.0
Mozilla	Thunderbird	<= 24.7
Mozilla	Thunderbird	24.0
Mozilla	Thunderbird	24.0.1
Mozilla	Thunderbird	24.1
Mozilla	Thunderbird	24.1.1
Mozilla	Thunderbird	24.2
Mozilla	Thunderbird	24.3
Mozilla	Thunderbird	24.4
Mozilla	Thunderbird	24.5
Mozilla	Thunderbird	24.6

References

Timeline

Published: Jul 23, 2014
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2014-1559?

How severe is CVE-2014-1559?

Severity scoring for CVE-2014-1559 is pending analysis. The EPSS model estimates a 1.71% probability of exploitation in the next 30 days.

How do I fix CVE-2014-1559?

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-2014-1559?

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

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Source: NVD / NIST