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CVE-2021-29950

Thunderbird unprotects a secret OpenPGP key prior to using it for a decryption, signing or key...

7.5 HighFix available

Thunderbird unprotects a secret OpenPGP key prior to using it for a decryption, signing or key import task. If the task runs into a failure, the secret key may remain in memory in its unprotected state. This vulnerability affects Thunderbird < 78.8.1.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.85%Up 0.2 points since Jun 25, 2021
90%50%10%1%

What each source reports

NVD Score used 7.5

Thunderbird unprotects a secret OpenPGP key prior to using it for a decryption, signing or key import task. If the task runs into a failure, the secret key may remain in memory in its unprotected state. This vulnerability affects Thunderbird < 78.8.1.

Record
CVE-2021-29950
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:P/I:N/A:N
Weakness
CWE-312
Updated
2026-11-02
CVE List No score

Thunderbird unprotects a secret OpenPGP key prior to using it for a decryption, signing or key import task. If the task runs into a failure, the secret key may remain in memory in its unprotected state. This vulnerability affects Thunderbird < 78.8.1.

Record
CVE-2021-29950
Updated
2026-11-02
EUVDEUVD-2021-16409 No score

Thunderbird unprotects a secret OpenPGP key prior to using it for a decryption, signing or key import task. If the task runs into a failure, the secret key may remain in memory in its unprotected state. This vulnerability affects Thunderbird < 78.8.1.

Record
EUVD-2021-16409
Updated
2026-11-03
GitHub AdvisoriesGHSA-4ghf-pq62-2jfh No score

Thunderbird unprotects a secret OpenPGP key prior to using it for a decryption, signing or key...

Thunderbird unprotects a secret OpenPGP key prior to using it for a decryption, signing or key import task. If the task runs into a failure, the secret key may remain in memory in its unprotected state. This vulnerability affects Thunderbird < 78.8.1.

Record
GHSA-4ghf-pq62-2jfh
Weakness
CWE-312
Updated
2026-11-02
OSV 7.5

Thunderbird unprotects a secret OpenPGP key prior to using it for a decryption, signing or key import task. If the task runs into a failure, the secret key may remain in memory in its unprotected state. This vulnerability affects Thunderbird < 78.8.1.

Record
CVE-2021-29950
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVDEBIAN-CVE-2021-29950 7.5

Thunderbird unprotects a secret OpenPGP key prior to using it for a decryption, signing or key import task. If the task runs into a failure, the secret key may remain in memory in its unprotected state. This vulnerability affects Thunderbird < 78.8.1.

Record
DEBIAN-CVE-2021-29950
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
Show 8 moreShow less
OSVRHSA-2021:1190 7.8

Red Hat Security Advisory: thunderbird security update

Record
RHSA-2021:1190
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRHSA-2021:1192 7.8

Red Hat Security Advisory: thunderbird security update

Record
RHSA-2021:1192
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRHSA-2021:1193 7.8

Red Hat Security Advisory: thunderbird security update

Record
RHSA-2021:1193
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRHSA-2021:1201 7.8

Red Hat Security Advisory: thunderbird security update

Record
RHSA-2021:1201
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2021-29950 7.5

Thunderbird unprotects a secret OpenPGP key prior to using it for a decryption, signing or key import task. If the task runs into a failure, the secret key may remain in memory in its unprotected state. This vulnerability affects Thunderbird < 78.8.1.

Record
UBUNTU-CVE-2021-29950
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVopenSUSE-SU-2021:1854-1 No score

Security update for MozillaThunderbird

This update for MozillaThunderbird fixes the following issues:

  • Mozilla Thunderbird 78.10.2
  • CVE-2021-29957: Fixed partial protection of inline OpenPGP message not indicated (bsc#1186198).
  • CVE-2021-29956: Fixed Thunderbird stored OpenPGP secret keys without master password protection (bsc#1186199).
  • CVE-2021-29951: Fixed Thunderbird Maintenance Service could have been started or stopped by domain users (bsc#1185633).
  • CVE-2021-29950: Fixed logic issue potentially leaves key material unlocked (bsc#1185086).
Record
openSUSE-SU-2021:1854-1
Updated
2026-11-02
OSVSUSE-SU-2021:1854-1 No score

Security update for MozillaThunderbird

This update for MozillaThunderbird fixes the following issues:

  • Mozilla Thunderbird 78.10.2
  • CVE-2021-29957: Fixed partial protection of inline OpenPGP message not indicated (bsc#1186198).
  • CVE-2021-29956: Fixed Thunderbird stored OpenPGP secret keys without master password protection (bsc#1186199).
  • CVE-2021-29951: Fixed Thunderbird Maintenance Service could have been started or stopped by domain users (bsc#1185633).
  • CVE-2021-29950: Fixed logic issue potentially leaves key material unlocked (bsc#1185086).
Record
SUSE-SU-2021:1854-1
Updated
2026-11-02
OSVUSN-4936-1 No score

thunderbird vulnerabilities

Multiple security issues were discovered in Thunderbird. If a user were tricked into opening a specially crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of service, obtain sensitive information, or execute arbitrary code. (CVE-2021-23968, CVE-2021-23969, CVE-2021-23973, CVE-2021-23978)

It was discovered that Thunderbird may keep key material in memory in some circumstances. A local attacker could potentially exploit this to obtain private keys. (CVE-2021-29950)

Record
USN-4936-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
thunderbird
Debian:12
 before 1:78.9.0-1
1:78.9.0-1
thunderbird
Debian:13
 before 1:78.9.0-1
1:78.9.0-1
thunderbird
Debian:14
 before 1:78.9.0-1
1:78.9.0-1
thunderbird
Debian:9
From an advisory covering 5 CVEs
 before 1:78.9.0-1~deb9u1, plus listed versions
1.5-41.5.0.2-11.5.0.2-21.5.0.2-31.5.0.4-1
Show 45 moreShow less
1.5.0.4-21.5.0.4-31.5.0.5-11.5.0.7-11.5.0.7-21:52.4.0-11:52.4.0-1~deb7u11:52.4.0-1~deb8u11:52.4.0-1~deb9u11:52.4.0-2~exp11:52.5.0-11:52.5.0-1~deb7u11:52.5.0-1~deb8u11:52.5.0-1~deb9u11:52.5.2-11:52.5.2-1~deb7u11:52.5.2-21:52.5.2-2~deb8u11:52.5.2-2~deb9u11:52.6.0-11:52.6.0-1+alpha.11:52.6.0-1+alpha.21:52.6.0-1~deb7u11:52.6.0-1~deb8u11:52.6.0-1~deb9u11:52.7.0-11:52.7.0-1~deb7u11:52.7.0-1~deb8u11:52.7.0-1~deb9u11:52.8.0-11:52.8.0-1~deb7u11:52.8.0-1~deb8u11:52.8.0-1~deb9u11:52.9.0-11:52.9.1-11:52.9.1-1~deb8u11:52.9.1-1~deb9u11:58.0~b3-11:60.0-11:60.0-21:60.0-2~deb9u11:60.0-31:60.0-3~deb9u11:60.0~b10-11:60.0~b2-1
1:78.9.0-1~deb9u1
thunderbird
Debian:10
From an advisory covering 6 CVEs
 before 1:78.9.0-1~deb10u1, plus listed versions
1:60.7.2-11:60.8.0-11:60.8.0-1~deb10u11:60.8.0-1~deb8u11:60.8.0-1~deb9u1
Show 45 moreShow less
1:60.8.0-21:60.9.0-11:60.9.0-1~deb10u11:60.9.0-1~deb8u11:60.9.0-1~deb9u11:65.0~b1-11:66.0~b1-11:67.0~b3-11:68.0~b1-11:68.1.1-1~exp11:68.1.2-1~exp11:68.10.0-11:68.10.0-1~deb10u11:68.10.0-1~deb9u11:68.11.0-11:68.11.0-1~deb10u11:68.11.0-1~deb9u11:68.11.0-21:68.11.0-31:68.12.0-11:68.12.0-1~deb10u11:68.12.0-1~deb9u11:68.12.0-1~deb9u21:68.2.1-11:68.2.2-11:68.2.2-1~deb10u11:68.2.2-1~deb8u11:68.2.2-1~deb9u11:68.3.0-11:68.3.0-21:68.3.0-2~deb10u11:68.3.0-2~deb8u11:68.3.0-2~deb9u11:68.3.1-11:68.4.1-11:68.4.1-1~deb10u11:68.4.1-1~deb8u11:68.4.1-1~deb9u11:68.4.2-11:68.5.0-11:68.5.0-1~deb10u11:68.5.0-1~deb8u11:68.5.0-1~deb9u11:68.6.0-11:68.6.0-1~deb10u1
1:78.9.0-1~deb10u1
thunderbird
Red Hat:rhel_eus:8.1::appstream
From an advisory covering 5 CVEs
 before 0:78.9.1-1.el8_1
0:78.9.1-1.el8_1
thunderbird-debuginfo
Red Hat:rhel_eus:8.1::appstream
From an advisory covering 5 CVEs
 before 0:78.9.1-1.el8_1
0:78.9.1-1.el8_1
thunderbird-debugsource
Red Hat:rhel_eus:8.1::appstream
From an advisory covering 5 CVEs
 before 0:78.9.1-1.el8_1
0:78.9.1-1.el8_1
thunderbird
Red Hat:enterprise_linux:7::client
From an advisory covering 5 CVEs
 before 0:78.9.1-1.el7_9
0:78.9.1-1.el7_9
thunderbird-debuginfo
Red Hat:enterprise_linux:7::client
From an advisory covering 5 CVEs
 before 0:78.9.1-1.el7_9
0:78.9.1-1.el7_9
Show 16 moreShow less
Affected packages
PackageAffectedFixed
thunderbird
Red Hat:enterprise_linux:7::server
From an advisory covering 5 CVEs
 before 0:78.9.1-1.el7_9
0:78.9.1-1.el7_9
thunderbird-debuginfo
Red Hat:enterprise_linux:7::server
From an advisory covering 5 CVEs
 before 0:78.9.1-1.el7_9
0:78.9.1-1.el7_9
thunderbird
Red Hat:enterprise_linux:7::workstation
From an advisory covering 5 CVEs
 before 0:78.9.1-1.el7_9
0:78.9.1-1.el7_9
thunderbird-debuginfo
Red Hat:enterprise_linux:7::workstation
From an advisory covering 5 CVEs
 before 0:78.9.1-1.el7_9
0:78.9.1-1.el7_9
thunderbird
Red Hat:enterprise_linux:8::appstream
From an advisory covering 5 CVEs
 before 0:78.9.1-1.el8_3
0:78.9.1-1.el8_3
thunderbird-debuginfo
Red Hat:enterprise_linux:8::appstream
From an advisory covering 5 CVEs
 before 0:78.9.1-1.el8_3
0:78.9.1-1.el8_3
thunderbird-debugsource
Red Hat:enterprise_linux:8::appstream
From an advisory covering 5 CVEs
 before 0:78.9.1-1.el8_3
0:78.9.1-1.el8_3
thunderbird
Red Hat:rhel_eus:8.2::appstream
From an advisory covering 5 CVEs
 before 0:78.9.1-1.el8_2
0:78.9.1-1.el8_2
thunderbird-debuginfo
Red Hat:rhel_eus:8.2::appstream
From an advisory covering 5 CVEs
 before 0:78.9.1-1.el8_2
0:78.9.1-1.el8_2
thunderbird-debugsource
Red Hat:rhel_eus:8.2::appstream
From an advisory covering 5 CVEs
 before 0:78.9.1-1.el8_2
0:78.9.1-1.el8_2
MozillaThunderbird
SUSE:Linux Enterprise Workstation Extension 15 SP2
From an advisory covering 4 CVEs
 before 78.10.2-8.27.1
78.10.2-8.27.1
MozillaThunderbird
SUSE:Linux Enterprise Workstation Extension 15 SP3
From an advisory covering 4 CVEs
 before 78.10.2-8.27.1
78.10.2-8.27.1
thunderbird
Ubuntu:18.04:LTS
 before 1:78.8.1+build1-0ubuntu0.18.04.1, plus listed versions
1:52.4.0+build1-0ubuntu21:52.6.0+build1-0ubuntu11:52.7.0+build1-0ubuntu11:52.8.0+build1-0ubuntu0.18.04.11:52.9.1+build3-0ubuntu0.18.04.1
Show 15 moreShow less
1:60.2.1+build1-0ubuntu0.18.04.21:60.4.0+build2-0ubuntu0.18.04.11:60.5.1+build2-0ubuntu0.18.04.11:60.6.1+build2-0ubuntu0.18.04.11:60.7.0+build1-0ubuntu0.18.04.11:60.7.1+build1-0ubuntu0.18.04.11:60.7.2+build2-0ubuntu0.18.04.11:60.8.0+build1-0ubuntu0.18.04.11:60.9.0+build1-0ubuntu0.18.04.11:68.2.1+build1-0ubuntu0.18.04.11:68.2.2+build1-0ubuntu0.18.04.11:68.4.1+build1-0ubuntu0.18.04.11:68.7.0+build1-0ubuntu0.18.04.11:68.8.0+build2-0ubuntu0.18.04.21:68.10.0+build1-0ubuntu0.18.04.1
1:78.8.1+build1-0ubuntu0.18.04.1
thunderbird
Ubuntu:20.04:LTS
 before 1:78.8.1+build1-0ubuntu0.20.04.1, plus listed versions
1:68.1.2+build1-0ubuntu11:68.1.2+build1-0ubuntu21:68.2.1+build1-0ubuntu11:68.2.2+build1-0ubuntu11:68.3.0+build2-0ubuntu1
Show 10 moreShow less
1:68.3.1+build1-0ubuntu21:68.4.1+build1-0ubuntu11:68.4.2+build2-0ubuntu11:68.5.0+build1-0ubuntu11:68.6.0+build2-0ubuntu11:68.7.0+build1-0ubuntu11:68.7.0+build1-0ubuntu21:68.8.0+build2-0ubuntu0.20.04.21:68.10.0+build1-0ubuntu0.20.04.11:78.7.1+build1-0ubuntu0.20.04.1
1:78.8.1+build1-0ubuntu0.20.04.1
thunderbird
Ubuntu:20.04:LTS
From an advisory covering 5 CVEs
 before 1:78.8.1+build1-0ubuntu0.20.04.1, plus listed versions
1:68.1.2+build1-0ubuntu11:68.1.2+build1-0ubuntu21:68.2.1+build1-0ubuntu11:68.2.2+build1-0ubuntu11:68.3.0+build2-0ubuntu1
Show 10 moreShow less
1:68.3.1+build1-0ubuntu21:68.4.1+build1-0ubuntu11:68.4.2+build2-0ubuntu11:68.5.0+build1-0ubuntu11:68.6.0+build2-0ubuntu11:68.7.0+build1-0ubuntu11:68.7.0+build1-0ubuntu21:68.8.0+build2-0ubuntu0.20.04.21:68.10.0+build1-0ubuntu0.20.04.11:78.7.1+build1-0ubuntu0.20.04.1
1:78.8.1+build1-0ubuntu0.20.04.1
MozillaThunderbird
openSUSE:Leap 15.3
From an advisory covering 4 CVEs
 before 78.10.2-8.27.1
78.10.2-8.27.1

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-29950 is a high vulnerability (CVSS 7.5) in Mozilla Thunderbird, published March 25, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.85%, the 58th percentile. Fixed in thunderbird 1:78.9.0-1.

References

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Left out here: 205 versions. The JSON record has them.

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