CVE-2018-5131
This vulnerability affects Firefox ESR < 52.7 and Firefox < 59.
Does this matter?
Lower severity and a low EPSS score (2.25%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.0
- 5.9 MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 2.25% probability · 83th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-200
- Affected
- debian/debian linux · mozilla/firefox · redhat/enterprise linux desktop · redhat/enterprise linux server · redhat/enterprise linux server aus · redhat/enterprise linux server eus · redhat/enterprise linux workstation · canonical/ubuntu linux
- Source
- security@mozilla.org
EPSS 2.2% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.