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CVE-2015-4520

UnknownEPSS 3.09%

Last modified

CVE-2015-4520 is a vulnerability of currently unknown severity. Mozilla Firefox before 41.0 and Firefox ESR 38.x before 38.3 allow remote attackers to bypass CORS preflight protection mechanisms by leveraging (1) duplicate cache-key generation or (2) retrieval of a value from an incorrect HTTP Access-Control-* response header.. EPSS estimates a 3.09% chance of exploitation in the next 30 days.

Description

Mozilla Firefox before 41.0 and Firefox ESR 38.x before 38.3 allow remote attackers to bypass CORS preflight protection mechanisms by leveraging (1) duplicate cache-key generation or (2) retrieval of a value from an incorrect HTTP Access-Control-* response header.

Metrics

EPSS Probability
3.09%

86.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
MozillaFirefox38.0
MozillaFirefox38.0.1
MozillaFirefox38.0.5
MozillaFirefox38.1.0
MozillaFirefox38.1.1
MozillaFirefox38.2.0
MozillaFirefox38.2.1
MozillaFirefox<= 40.0.3

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2015-4520?
Mozilla Firefox before 41.0 and Firefox ESR 38.x before 38.3 allow remote attackers to bypass CORS preflight protection mechanisms by leveraging (1) duplicate cache-key generation or (2) retrieval of a value from an incorrect HTTP Access-Control-* response header.
How severe is CVE-2015-4520?
Severity scoring for CVE-2015-4520 is pending analysis. The EPSS model estimates a 3.09% probability of exploitation in the next 30 days.
How do I fix CVE-2015-4520?
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-2015-4520?

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

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Source: NVD / NIST