CVE-2025-5272

Memory safety bugs present in Firefox 138 and Thunderbird 138. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 139 and Thunderbird < 139.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
7.3 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
mozillaCNA
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CISA-ADPADP
7.3 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: 17%
VendorProductVersion
mozillafirefox
𝑥
< 139.0
mozillathunderbird
𝑥
< 139.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
firefox
sid
145.0.1-1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
firefox
questing
not-affected
plucky
not-affected
oracular
not-affected
noble
not-affected
jammy
not-affected
focal
dne
thunderbird
questing
not-affected
plucky
not-affected
oracular
not-affected
noble
not-affected
jammy
not-affected
focal
dne
mozjs38
questing
dne
plucky
dne
oracular
dne
noble
dne
jammy
dne
focal
dne
bionic
needs-triage
mozjs52
questing
dne
plucky
dne
oracular
dne
noble
dne
jammy
dne
focal
ignored
bionic
ignored
mozjs68
questing
dne
plucky
dne
oracular
dne
noble
dne
jammy
dne
focal
ignored
mozjs78
questing
dne
plucky
dne
oracular
dne
noble
dne
jammy
ignored
focal
dne
mozjs91
questing
dne
plucky
dne
oracular
dne
noble
dne
jammy
ignored
focal
dne
mozjs102
questing
dne
plucky
dne
oracular
dne
noble
ignored
jammy
ignored
focal
dne
mozjs115
questing
dne
plucky
ignored
oracular
ignored
noble
ignored
jammy
dne
focal
dne
Common Weakness Enumeration
References
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1726254%2C1742738%2C1960121
https://www.mozilla.org/security/advisories/mfsa2025-42/
https://www.mozilla.org/security/advisories/mfsa2025-45/