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Vulnerability details: VCID-7wfc-m883-m7ft
Vulnerability ID VCID-7wfc-m883-m7ft
Aliases CVE-2021-29956
Summary OpenPGP secret keys that were imported using Thunderbird version 78.8.1 up to version 78.10.1 were stored unencrypted on the user's local disk. The master password protection was inactive for those keys. Version 78.10.2 will restore the protection mechanism for newly imported keys, and will automatically protect keys that had been imported using affected Thunderbird versions.
Status Published
Exploitability 0.5
Weighted Severity 3.9
Risk 1.9
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-522 Insufficiently Protected Credentials
CWE-312 Cleartext Storage of Sensitive Information
System Score Found at
cvssv3 4.2 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29956.json
epss 0.00133 https://api.first.org/data/v1/epss?cve=CVE-2021-29956
epss 0.00133 https://api.first.org/data/v1/epss?cve=CVE-2021-29956
epss 0.00133 https://api.first.org/data/v1/epss?cve=CVE-2021-29956
epss 0.00133 https://api.first.org/data/v1/epss?cve=CVE-2021-29956
epss 0.00133 https://api.first.org/data/v1/epss?cve=CVE-2021-29956
epss 0.00133 https://api.first.org/data/v1/epss?cve=CVE-2021-29956
epss 0.00133 https://api.first.org/data/v1/epss?cve=CVE-2021-29956
epss 0.00133 https://api.first.org/data/v1/epss?cve=CVE-2021-29956
epss 0.00133 https://api.first.org/data/v1/epss?cve=CVE-2021-29956
epss 0.00133 https://api.first.org/data/v1/epss?cve=CVE-2021-29956
epss 0.00133 https://api.first.org/data/v1/epss?cve=CVE-2021-29956
epss 0.00133 https://api.first.org/data/v1/epss?cve=CVE-2021-29956
epss 0.00133 https://api.first.org/data/v1/epss?cve=CVE-2021-29956
epss 0.00133 https://api.first.org/data/v1/epss?cve=CVE-2021-29956
epss 0.00133 https://api.first.org/data/v1/epss?cve=CVE-2021-29956
epss 0.00133 https://api.first.org/data/v1/epss?cve=CVE-2021-29956
epss 0.00133 https://api.first.org/data/v1/epss?cve=CVE-2021-29956
epss 0.00133 https://api.first.org/data/v1/epss?cve=CVE-2021-29956
cvssv3.1 3.3 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-29956
cvssv3.1 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-29956
archlinux Low https://security.archlinux.org/AVG-1964
generic_textual low https://www.mozilla.org/en-US/security/advisories/mfsa2021-22
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29956.json
https://api.first.org/data/v1/epss?cve=CVE-2021-29956
https://bugzilla.mozilla.org/show_bug.cgi?id=1710290
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29956
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29957
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29967
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://www.mozilla.org/security/advisories/mfsa2021-22/
1961504 https://bugzilla.redhat.com/show_bug.cgi?id=1961504
ASA-202105-29 https://security.archlinux.org/ASA-202105-29
AVG-1964 https://security.archlinux.org/AVG-1964
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:*:*:*:*:*:*:*:*
CVE-2021-29956 https://nvd.nist.gov/vuln/detail/CVE-2021-29956
mfsa2021-22 https://www.mozilla.org/en-US/security/advisories/mfsa2021-22
RHSA-2021:2261 https://access.redhat.com/errata/RHSA-2021:2261
RHSA-2021:2262 https://access.redhat.com/errata/RHSA-2021:2262
RHSA-2021:2263 https://access.redhat.com/errata/RHSA-2021:2263
RHSA-2021:2264 https://access.redhat.com/errata/RHSA-2021:2264
USN-4995-1 https://usn.ubuntu.com/4995-1/
USN-4995-2 https://usn.ubuntu.com/4995-2/
No exploits are available.
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-29956.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: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
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-2021-29956
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:L/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-29956
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 0.33798
EPSS Score 0.00133
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:49.394064+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2021/mfsa2021-22.yml 37.0.0