CVE-2018-12383

Name: CVE-2018-12383
Creator: NVD / NIST
Published: 2018-10-18T13:29:05.837+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 0.46%

Last modified Jun 17, 2026

CVE-2018-12383 is a vulnerability of currently unknown severity. If a user saved passwords before Firefox 58 and then later set a master password, an unencrypted copy of these passwords is still accessible. This is because the older stored password file was not deleted when the data was copied to a new format starting in Firefox 58. EPSS estimates a 0.46% chance of exploitation in the next 30 days.

Description

If a user saved passwords before Firefox 58 and then later set a master password, an unencrypted copy of these passwords is still accessible. This is because the older stored password file was not deleted when the data was copied to a new format starting in Firefox 58. The new master password is added only on the new file. This could allow the exposure of stored password data outside of user expectations. This vulnerability affects Firefox < 62, Firefox ESR < 60.2.1, and Thunderbird < 60.2.1.

Metrics

EPSS Probability

0.46%

36.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-522

Affected Software

Vendor	Product	Versions
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	7.6
Redhat	Enterprise Linux Server Eus	7.5
Redhat	Enterprise Linux Server Eus	7.6
Redhat	Enterprise Linux Server Tus	7.6
Redhat	Enterprise Linux Workstation	6.0
Redhat	Enterprise Linux Workstation	7.0
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Mozilla	Firefox	< 62.0
Mozilla	Firefox Esr	< 60.2.1
Mozilla	Thunderbird	< 60.2.1

References

http://www.securityfocus.com/bid/105276Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041610Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041701Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:2834Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2835Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3403Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3458Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1475775Exploit, Issue Tracking, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2018/11/msg00011.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/201810-01Third Party Advisory
https://security.gentoo.org/glsa/201811-13Third Party Advisory
https://usn.ubuntu.com/3761-1/Third Party Advisory
https://usn.ubuntu.com/3793-1/Third Party Advisory
https://www.debian.org/security/2018/dsa-4304Third Party Advisory
https://www.debian.org/security/2018/dsa-4327Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2018-20/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2018-23/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2018-25/Vendor Advisory
http://www.securityfocus.com/bid/105276Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041610Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041701Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:2834Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2835Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3403Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3458Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1475775Exploit, Issue Tracking, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2018/11/msg00011.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/201810-01Third Party Advisory
https://security.gentoo.org/glsa/201811-13Third Party Advisory
https://usn.ubuntu.com/3761-1/Third Party Advisory
https://usn.ubuntu.com/3793-1/Third Party Advisory
https://www.debian.org/security/2018/dsa-4304Third Party Advisory
https://www.debian.org/security/2018/dsa-4327Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2018-20/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2018-23/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2018-25/Vendor Advisory

Timeline

Published: Oct 18, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-12383?

How severe is CVE-2018-12383?

Severity scoring for CVE-2018-12383 is pending analysis. The EPSS model estimates a 0.46% probability of exploitation in the next 30 days.

How do I fix CVE-2018-12383?

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-2018-12383?

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

Scan your code now

Source: NVD / NIST