CVE-2025-1016

28

FAUCET Score

CVE-2025-1016 is a critical memory safety vulnerability affecting multiple versions of Mozilla Firefox and Thunderbird, including Firefox 134, Thunderbird 134, and various ESR releases. This flaw, rated 9.8 CVSS (Critical), allows for unauthenticated, low-complexity remote exploitation, potentially leading to arbitrary code execution, complete compromise of confidentiality, integrity, and availability. While not yet in CISA's KEV catalog, the vulnerability has garnered significant community discussion and media coverage, indicating a high level of awareness despite no public exploit code being available.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		< 115.20.0CPE matchmatch criteria	cpe:2.3:a:mozilla:firefox:::::esr:::*
		< 135.0CPE matchmatch criteria	cpe:2.3:a:mozilla:firefox:::::-:::*
		>= 128.1.0, < 128.7.0CPE matchmatch criteria	cpe:2.3:a:mozilla:firefox:::::esr:::*
		>= 128.0.1, < 128.7.0CPE matchmatch criteria	cpe:2.3:a:mozilla:thunderbird:::::esr:::*
		>= 131.0, < 135.0CPE matchmatch criteria	cpe:2.3:a:mozilla:thunderbird:::::-:::*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

Exploitability Score

3.9

Impact Score

5.9

CvssVersion

3.1

Exploit Intelligence

EPSS Score

0.57%

Probability of exploitation in next 30 days

EPSS Percentile

43.8%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0057 is in the 24th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 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-0:128.7.0-1.el7_9

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: firefox-0:128.7.0-1.el8_10

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: thunderbird-0:128.7.0-1.el8_10

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.2 Advanced Update SupportFixed in: firefox-0:128.7.0-1.el8_2

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.2 Advanced Update SupportFixed in: thunderbird-0:128.7.0-1.el8_2

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportFixed in: firefox-0:128.7.0-1.el8_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportFixed in: thunderbird-0:128.7.0-1.el8_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceFixed in: firefox-0:128.7.0-1.el8_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceFixed in: thunderbird-0:128.7.0-1.el8_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsFixed in: firefox-0:128.7.0-1.el8_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsFixed in: thunderbird-0:128.7.0-1.el8_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportFixed in: firefox-0:128.7.0-1.el8_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportFixed in: thunderbird-0:128.7.0-1.el8_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceFixed in: firefox-0:128.7.0-1.el8_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceFixed in: thunderbird-0:128.7.0-1.el8_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsFixed in: firefox-0:128.7.0-1.el8_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsFixed in: thunderbird-0:128.7.0-1.el8_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.8 Extended Update SupportFixed in: firefox-0:128.7.0-1.el8_8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.8 Extended Update SupportFixed in: thunderbird-0:128.7.0-1.el8_8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9Fixed in: firefox-0:128.7.0-1.el9_5

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9Fixed in: thunderbird-0:128.7.0-1.el9_5

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsFixed in: firefox-0:128.7.0-1.el9_0

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsFixed in: thunderbird-0:128.7.0-1.el9_0

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9.2 Extended Update SupportFixed in: firefox-0:128.7.0-1.el9_2

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9.2 Extended Update SupportFixed in: thunderbird-0:128.7.0-1.el9_2

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9.4 Extended Update SupportFixed in: firefox-0:128.7.0-1.el9_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9.4 Extended Update SupportFixed in: thunderbird-0:128.7.0-1.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-container

redhatno patchvia redhat_api

Product: Red Hat Enterprise Linux 9Fixed in: thunderbird-flatpak-container

redhatno patchvia redhat_api

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

Vendor Advisories (1)

redhatCVE-2025-1016Important

firefox: thunderbird: Memory safety bugs fixed in Firefox 135, Thunderbird 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 115.20, and Thunderbird 128.7

References

lists.debian.org / debian-lts-announce/2025/02/msg00006.html

bugzilla.mozilla.org / buglist.cgi

Broken Link

mozilla.org / security/advisories/mfsa2025-07

Vendor Advisory

mozilla.org / security/advisories/mfsa2025-08

Vendor Advisory

mozilla.org / security/advisories/mfsa2025-09

Vendor Advisory

mozilla.org / security/advisories/mfsa2025-10

Vendor Advisory

mozilla.org / security/advisories/mfsa2025-11

Vendor Advisory