CVE-2015-4503

Name: CVE-2015-4503
Creator: NVD / NIST
Published: 2015-09-24T04:59:06.16+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.56%

Last modified Jun 17, 2026

CVE-2015-4503 is a vulnerability of currently unknown severity. The TCP Socket API implementation in Mozilla Firefox before 41.0 mishandles array boundaries that were established with a navigator.mozTCPSocket.open method call and send method calls, which allows remote TCP servers to obtain sensitive information from process memory by reading packet data, as demonstrated by availability of this API in a Firefox OS application.. EPSS estimates a 1.56% chance of exploitation in the next 30 days.

Description

The TCP Socket API implementation in Mozilla Firefox before 41.0 mishandles array boundaries that were established with a navigator.mozTCPSocket.open method call and send method calls, which allows remote TCP servers to obtain sensitive information from process memory by reading packet data, as demonstrated by availability of this API in a Firefox OS application.

Metrics

EPSS Probability

1.56%

72.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	<= 40.0.3

References

Timeline

Published: Sep 24, 2015
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2015-4503?

How severe is CVE-2015-4503?

Severity scoring for CVE-2015-4503 is pending analysis. The EPSS model estimates a 1.56% probability of exploitation in the next 30 days.

How do I fix CVE-2015-4503?

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-2015-4503?

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

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Source: NVD / NIST