CVE-2025-0238

17

FAUCET Score

CVE-2025-0238 is a use-after-free vulnerability affecting Firefox versions prior to 134, Firefox ESR prior to 128.6 and 115.19, and Thunderbird prior to 134 and 128.6. This flaw, triggered by a controlled failed memory allocation, could lead to a potentially exploitable crash. Rated Medium severity with a CVSS score of 5.3, it has a network attack vector and low attack complexity, with a potential impact of low confidentiality. There is currently no evidence of active exploitation, public exploit code, or significant community discussion, and it is not listed on the CISA KEV catalog.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		< 115.19.0CPE matchmatch criteria	cpe:2.3:a:mozilla:firefox:::::esr:::*
		< 134.0CPE matchmatch criteria	cpe:2.3:a:mozilla:firefox::::::::
		>= 116.0, < 128.6.0CPE matchmatch criteria	cpe:2.3:a:mozilla:firefox:::::esr:::*
		< 128.6CPE matchmatch criteria	cpe:2.3:a:mozilla:thunderbird::::::::
		>= 129.0, < 134.0CPE matchmatch criteria	cpe:2.3:a:mozilla:thunderbird::::::::

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

Exploitability Score

3.9

Impact Score

1.4

CvssVersion

3.1

Exploit Intelligence

EPSS Score

0.81%

Probability of exploitation in next 30 days

EPSS Percentile

53.2%

Percentile rank of EPSS score among Peer Group

As of 2026-07-28

Model: v2026.06.15

This CVE's current EPSS score of 0.0081 is in the 33rd percentile among its peer group of 23,725 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (34)

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7 Extended Lifecycle SupportFixed in: firefox-0:128.6.0-1.el7_9

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: firefox-0:128.6.0-1.el8_10

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: thunderbird-0:128.6.0-3.el8_10

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.2 Advanced Update SupportFixed in: firefox-0:128.6.0-1.el8_2

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.2 Advanced Update SupportFixed in: thunderbird-0:128.6.0-3.el8_2

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportFixed in: firefox-0:128.6.0-1.el8_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportFixed in: thunderbird-0:128.6.0-3.el8_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceFixed in: firefox-0:128.6.0-1.el8_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceFixed in: thunderbird-0:128.6.0-3.el8_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsFixed in: firefox-0:128.6.0-1.el8_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsFixed in: thunderbird-0:128.6.0-3.el8_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportFixed in: firefox-0:128.6.0-1.el8_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportFixed in: thunderbird-0:128.6.0-3.el8_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceFixed in: firefox-0:128.6.0-1.el8_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceFixed in: thunderbird-0:128.6.0-3.el8_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsFixed in: firefox-0:128.6.0-1.el8_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsFixed in: thunderbird-0:128.6.0-3.el8_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.8 Extended Update SupportFixed in: firefox-0:128.6.0-1.el8_8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.8 Extended Update SupportFixed in: thunderbird-0:128.6.0-3.el8_8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9Fixed in: firefox-0:128.6.0-1.el9_5

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9Fixed in: thunderbird-0:128.6.0-3.el9_5

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsFixed in: firefox-0:128.6.0-1.el9_0

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsFixed in: thunderbird-0:128.6.0-3.el9_0

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9.2 Extended Update SupportFixed in: firefox-0:128.6.0-1.el9_2

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9.2 Extended Update SupportFixed in: thunderbird-0:128.6.0-3.el9_2

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9.4 Extended Update SupportFixed in: firefox-0:128.6.0-1.el9_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9.4 Extended Update SupportFixed in: thunderbird-0:128.6.0-3.el9_4

mozillavendor investigatingvia nvd_reference

redhatno patchvia redhat_api

Product: Red Hat Enterprise Linux 10Fixed in: firefox-flatpak-container

redhatno patchvia redhat_api

Product: Red Hat Enterprise Linux 10Fixed in: thunderbird

redhatno patchvia redhat_api

Product: Red Hat Enterprise Linux 10Fixed in: firefox

redhatno patchvia redhat_api

Product: Red Hat Enterprise Linux 9Fixed in: firefox:flatpak/firefox

redhatno patchvia redhat_api

Product: Red Hat Enterprise Linux 9Fixed in: thunderbird:flatpak/thunderbird

redhatno patchvia redhat_api

Product: Red Hat Enterprise Linux 10Fixed in: thunderbird-flatpak-container

Vendor Advisories (1)

redhatCVE-2025-0238Moderate

firefox: thunderbird: Use-after-free when breaking lines in text

References

lists.debian.org / debian-lts-announce/2025/01/msg00004.html

bugzilla.mozilla.org / show_bug.cgi

Issue TrackingPermissions Required

mozilla.org / security/advisories/mfsa2025-01

Vendor Advisory

mozilla.org / security/advisories/mfsa2025-02

Vendor Advisory

mozilla.org / security/advisories/mfsa2025-03

Vendor Advisory

mozilla.org / security/advisories/mfsa2025-04

Vendor Advisory

mozilla.org / security/advisories/mfsa2025-05

Vendor Advisory