Is CVE-2017-5378 in the CISA KEV catalog?

No. CVE-2017-5378 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-5378?

CVE-2017-5378 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2017-5378?

CVE-2017-5378 has an EPSS score of 3.40% (87th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-5378?

Upgrade firefox on debian unstable to 51.0-1 or later. Fixes are available for 6 affected products.

CVE & CISA-KEV Catalog

CVE-2017-5378

HIGHEPSS 87th pctl

7.5

CVSS v3

NVD

Description

Hashed codes of JavaScript objects are shared between pages. This allows for pointer leaks because an object's address can be discovered through hash codes, and also allows for data leakage of an object's content using these hash codes. This vulnerability affects Thunderbird < 45.7, Firefox ESR < 45.7, and Firefox < 51.

CWE-200Information Exposure

How to fix

Remediation Available

firefoxDebian

Fixed in:51.0-1CVE-2017-5378

firefoxUbuntu

Fixed in:51.0.1+build2-0ubuntu0.14.04.1USN-3175-1

Fixed in:51.0.1+build2-0ubuntu0.16.04.1USN-3175-1

thunderbirdUbuntu

Fixed in:1:45.7.0+build1-0ubuntu0.14.04.1USN-3165-1

Fixed in:1:45.7.0+build1-0ubuntu0.16.04.1USN-3165-1

DeveloperEditionWindows application

Affected:45.7.0Fixed in:45.7.0Mozilla

Affected:51.0Fixed in:51.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:45.7.0Fixed in:45.7.0Mozilla

Affected:51.0Fixed in:51.0Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:45.7.0Fixed in:45.7.0Mozilla

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

Exploit Intelligence

3.40%probability of exploitation in 30 days

87thpercentile

Elevated risk: more likely to be exploited than 87% of all known CVEs.

References

Patch1

bugzilla.mozilla.org

Exploit1

bugzilla.mozilla.org

Vendor Advisory3

Third-Party Advisory8

Related Vulnerabilities

Other CWE-200 (Information Exposure) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-24919	High	8.6	100%	KEV + Ransom	-
CVE-2020-14181	Medium	5.3	100%	-	Fix
CVE-2021-34429	Medium	5.3	99%	-	Fix
CVE-2018-11409	Medium	5.3	98%	-	-
CVE-2021-41277	Critical	10.0	97%	KEV	-
CVE-2016-2183	High	7.5	96%	-	Fix

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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 2025-11-25.