Is CVE-2014-1487 in the CISA KEV catalog?

No. CVE-2014-1487 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2014-1487?

CVE-2014-1487 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2014-1487?

CVE-2014-1487 has an EPSS score of 2.33% (81th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2014-1487?

Upgrade DeveloperEdition to 24.3 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2014-1487

HIGHEPSS 81th pctl

7.5

CVSS v3

NVD

Description

The Web workers implementation in Mozilla Firefox before 27.0, Firefox ESR 24.x before 24.3, Thunderbird before 24.3, and SeaMonkey before 2.24 allows remote attackers to bypass the Same Origin Policy and obtain sensitive authentication information via vectors involving error messages.

CWE-346

How to fix

Remediation Available

DeveloperEditionWindows application

Affected:24.0 24.3Fixed in:24.3Mozilla

Affected:27.0Fixed in:27.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:27.0Fixed in:27.0Mozilla

Affected:24.0 24.3Fixed in:24.3Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:24.3Fixed in:24.3Mozilla

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 ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

2.33%probability of exploitation in 30 days

81stpercentile

Elevated risk: more likely to be exploited than 81% of all known CVEs.

References

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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 2026-04-29.