CVE-2021-23993

An attacker may perform a DoS attack to prevent a user from sending encrypted email to a correspondent. If an attacker creates a crafted OpenPGP key with a subkey that has an invalid self signature, and the Thunderbird user imports the crafted key, then Thunderbird may try to use the invalid subkey, but the RNP library rejects it from being used, causing encryption to fail. This vulnerability affects Thunderbird < 78.9.1.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
6.5 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
mozillaCNA
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CVEADP
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Base Score
CVSS 3.x
EPSS Score
Percentile: 17%
VendorProductVersion
mozillathunderbird
𝑥
< 78.9.1
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
thunderbird
bullseye
1:115.12.0-1~deb11u1
fixed
bullseye (security)
1:128.4.0esr-1~deb11u1
fixed
bookworm
1:115.12.0-1~deb12u1
fixed
bookworm (security)
1:115.16.0esr-1~deb12u1
fixed
sid
1:128.4.0esr-1
fixed
trixie
1:128.4.0esr-1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
thunderbird
lunar
Fixed 1:78.11.0+build1-0ubuntu2
released
kinetic
Fixed 1:78.11.0+build1-0ubuntu2
released
jammy
Fixed 1:78.11.0+build1-0ubuntu2
released
impish
Fixed 1:78.11.0+build1-0ubuntu2
released
hirsute
Fixed 1:78.11.0+build1-0ubuntu0.21.04.2
released
groovy
Fixed 1:78.11.0+build1-0ubuntu0.20.10.2
released
focal
Fixed 1:78.11.0+build1-0ubuntu0.20.04.2
released
bionic
Fixed 1:78.11.0+build1-0ubuntu0.18.04.2
released
xenial
ignored
trusty
dne