CVE-2016-5270

Name: CVE-2016-5270
Creator: NVD / NIST
Published: 2016-09-22T22:59:03.677+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 3.93%

Last modified Jun 17, 2026

CVE-2016-5270 is a vulnerability of currently unknown severity. Heap-based buffer overflow in the nsCaseTransformTextRunFactory::TransformString function in Mozilla Firefox before 49.0, Firefox ESR 45.x before 45.4, and Thunderbird < 45.4 allows remote attackers to cause a denial of service (boolean out-of-bounds write) or possibly have unspecified other impact via Unicode characters that are mishandled during text conversion.. EPSS estimates a 3.93% chance of exploitation in the next 30 days.

Description

Heap-based buffer overflow in the nsCaseTransformTextRunFactory::TransformString function in Mozilla Firefox before 49.0, Firefox ESR 45.x before 45.4, and Thunderbird < 45.4 allows remote attackers to cause a denial of service (boolean out-of-bounds write) or possibly have unspecified other impact via Unicode characters that are mishandled during text conversion.

Metrics

EPSS Probability

3.93%

89.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	<= 48.0.2
Mozilla	Firefox	45.1.0
Mozilla	Firefox	45.1.1
Mozilla	Firefox	45.2.0
Mozilla	Firefox	45.3.0

References

Timeline

Published: Sep 22, 2016
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2016-5270?

How severe is CVE-2016-5270?

Severity scoring for CVE-2016-5270 is pending analysis. The EPSS model estimates a 3.93% probability of exploitation in the next 30 days.

How do I fix CVE-2016-5270?

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-2016-5270?

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

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Source: NVD / NIST