CVE-2018-5131

Name: CVE-2018-5131
Creator: NVD / NIST
Published: 2018-06-11T21:29:14.157+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.32%

Last modified Jun 17, 2026

CVE-2018-5131 is a vulnerability of currently unknown severity. 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. EPSS estimates a 2.32% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

2.32%

81.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions
Debian	Debian Linux	7.0
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0
Mozilla	Firefox	< 59.0
Mozilla	Firefox	< 52.7.0
Redhat	Enterprise Linux Desktop	6.0
Redhat	Enterprise Linux Desktop	7.0
Redhat	Enterprise Linux Server	6.0
Redhat	Enterprise Linux Server	7.0
Redhat	Enterprise Linux Server Aus	7.4
Redhat	Enterprise Linux Server Eus	7.4
Redhat	Enterprise Linux Server Eus	7.5
Redhat	Enterprise Linux Workstation	6.0
Redhat	Enterprise Linux Workstation	7.0
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	17.10

References

http://www.securityfocus.com/bid/103388Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1040514Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:0526Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:0527Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1440775Issue Tracking, Permissions Required, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/03/msg00010.htmlThird Party Advisory
https://security.gentoo.org/glsa/201810-01Third Party Advisory
https://usn.ubuntu.com/3596-1/Third Party Advisory
https://www.debian.org/security/2018/dsa-4139Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2018-06/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2018-07/Vendor Advisory
http://www.securityfocus.com/bid/103388Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1040514Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:0526Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:0527Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1440775Issue Tracking, Permissions Required, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/03/msg00010.htmlThird Party Advisory
https://security.gentoo.org/glsa/201810-01Third Party Advisory
https://usn.ubuntu.com/3596-1/Third Party Advisory
https://www.debian.org/security/2018/dsa-4139Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2018-06/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2018-07/Vendor Advisory

Timeline

Published: Jun 11, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-5131?

How severe is CVE-2018-5131?

Severity scoring for CVE-2018-5131 is pending analysis. The EPSS model estimates a 2.32% probability of exploitation in the next 30 days.

How do I fix CVE-2018-5131?

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-2018-5131?

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

Scan your code now

Source: NVD / NIST