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Vulnerability details: VCID-tcct-6ugp-t7ag
Vulnerability ID VCID-tcct-6ugp-t7ag
Aliases CVE-2020-6794
Summary If a user saved passwords before Thunderbird 60 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 Thunderbird 60. The new master password is added only on the new file. This could allow the exposure of stored password data outside of user expectations.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-312 Cleartext Storage of Sensitive Information
CWE-459 Incomplete Cleanup
CWE-522 Insufficiently Protected Credentials
System Score Found at
cvssv3 6.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-6794.json
epss 0.00326 https://api.first.org/data/v1/epss?cve=CVE-2020-6794
epss 0.00326 https://api.first.org/data/v1/epss?cve=CVE-2020-6794
epss 0.00326 https://api.first.org/data/v1/epss?cve=CVE-2020-6794
epss 0.00326 https://api.first.org/data/v1/epss?cve=CVE-2020-6794
epss 0.00326 https://api.first.org/data/v1/epss?cve=CVE-2020-6794
epss 0.00326 https://api.first.org/data/v1/epss?cve=CVE-2020-6794
epss 0.00326 https://api.first.org/data/v1/epss?cve=CVE-2020-6794
epss 0.00326 https://api.first.org/data/v1/epss?cve=CVE-2020-6794
epss 0.00326 https://api.first.org/data/v1/epss?cve=CVE-2020-6794
epss 0.00326 https://api.first.org/data/v1/epss?cve=CVE-2020-6794
epss 0.00326 https://api.first.org/data/v1/epss?cve=CVE-2020-6794
epss 0.00326 https://api.first.org/data/v1/epss?cve=CVE-2020-6794
epss 0.00326 https://api.first.org/data/v1/epss?cve=CVE-2020-6794
epss 0.00326 https://api.first.org/data/v1/epss?cve=CVE-2020-6794
epss 0.00326 https://api.first.org/data/v1/epss?cve=CVE-2020-6794
epss 0.00326 https://api.first.org/data/v1/epss?cve=CVE-2020-6794
epss 0.00326 https://api.first.org/data/v1/epss?cve=CVE-2020-6794
epss 0.00326 https://api.first.org/data/v1/epss?cve=CVE-2020-6794
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2020-6794
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2020-6794
archlinux Critical https://security.archlinux.org/AVG-1099
generic_textual none https://www.mozilla.org/en-US/security/advisories/mfsa2020-07
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-6794.json
https://api.first.org/data/v1/epss?cve=CVE-2020-6794
https://bugzilla.mozilla.org/show_bug.cgi?id=1606619
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6792
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6793
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6794
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6795
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6798
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6800
https://security.gentoo.org/glsa/202003-10
https://www.mozilla.org/security/advisories/mfsa2020-07/
1801956 https://bugzilla.redhat.com/show_bug.cgi?id=1801956
ASA-202002-9 https://security.archlinux.org/ASA-202002-9
AVG-1099 https://security.archlinux.org/AVG-1099
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*
CVE-2020-6794 https://nvd.nist.gov/vuln/detail/CVE-2020-6794
mfsa2020-07 https://www.mozilla.org/en-US/security/advisories/mfsa2020-07
RHSA-2020:0565 https://access.redhat.com/errata/RHSA-2020:0565
RHSA-2020:0574 https://access.redhat.com/errata/RHSA-2020:0574
RHSA-2020:0576 https://access.redhat.com/errata/RHSA-2020:0576
RHSA-2020:0577 https://access.redhat.com/errata/RHSA-2020:0577
USN-4328-1 https://usn.ubuntu.com/4328-1/
USN-4335-1 https://usn.ubuntu.com/4335-1/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-6794.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-6794
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-6794
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.5493
EPSS Score 0.00326
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:42.765880+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2020/mfsa2020-07.yml 37.0.0