CVE & CISA-KEV Catalog

CVE-2018-5131

MEDIUMEPSS 81th pctl
5.9
CVSS v3
NVD

Description

Under certain circumstances the "fetch()" API can return transient local copies of resources that were sent with a "no-store" or "no-cache" cache header instead of downloading a copy from the network as it should. This can result in previously stored, locally cached data of a website being accessible to users if they share a common profile while browsing. This vulnerability affects Firefox ESR < 52.7 and Firefox < 59.

CWE-200Information Exposure

How to fix

Remediation Available
firefoxDebian
Fixed in:59.0-1CVE-2018-5131
firefoxUbuntu
Fixed in:59.0+build5-0ubuntu0.14.04.1USN-3596-1
Fixed in:59.0+build5-0ubuntu0.16.04.1USN-3596-1
DeveloperEditionWindows application
Affected:52.7.0Fixed in:52.7.0Mozilla
Affected:59.0Fixed in:59.0Mozilla
Mozilla Firefox (en-US)Windows application
Affected:59.0Fixed in:59.0Mozilla
Affected:52.7.0Fixed in:52.7.0Mozilla

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 ComplexityHigh
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityNone
AvailabilityNone

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

Exploit Intelligence

2.32%probability of exploitation in 30 days
81stpercentile

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

References

Vendor Advisory2

Related Vulnerabilities

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

CVESeverityCVSSEPSSExploitedFix
CVE-2024-24919High8.6100%KEV + Ransom-
CVE-2020-14181Medium5.3100%-Fix
CVE-2021-34429Medium5.399%-Fix
CVE-2018-11409Medium5.398%--
CVE-2021-41277Critical10.097%KEV-
CVE-2016-2183High7.596%-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.