CVE-2025-11721

EUVD-2025-34197
Memory safety bug present in Firefox 143 and Thunderbird 143. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox < 144 and Thunderbird < 144.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA-ADPADP
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 22%
Affected Products (NVD)
VendorProductVersion
mozillafirefox
143.0 ≤
𝑥
< 144.0
mozillathunderbird
143.0 ≤
𝑥
< 144.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
firefox
sid
148.0-1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
firefox
jammy
not-affected
noble
not-affected
plucky
not-affected
questing
not-affected
thunderbird
jammy
not-affected
noble
not-affected
plucky
not-affected
questing
not-affected
mozjs38
bionic
needs-triage
jammy
dne
noble
dne
plucky
dne
questing
dne
mozjs52
bionic
ignored
focal
ignored
jammy
dne
noble
dne
plucky
dne
questing
dne
mozjs68
focal
ignored
jammy
dne
noble
dne
plucky
dne
questing
dne
mozjs78
jammy
ignored
noble
dne
plucky
dne
questing
dne
mozjs91
jammy
ignored
noble
dne
plucky
dne
questing
dne
mozjs102
jammy
ignored
noble
ignored
plucky
dne
questing
dne
mozjs115
jammy
dne
noble
ignored
plucky
ignored
questing
dne
Common Weakness Enumeration
References
https://bugzilla.mozilla.org/show_bug.cgi?id=1986816
https://www.mozilla.org/security/advisories/mfsa2025-81/
https://www.mozilla.org/security/advisories/mfsa2025-84/