CVE-2025-3028 [Medium] | Use-After-Free in Firefox

CVE-2025-3028 is rated Exploit Available (53.6/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.15%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

EDB-ID	Source	Kind	Published	Link
—	nvd_ref	exploit_tag		Exploit-DB ↗

EDB-ID

Source

Kind

Published

Link

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nvd_ref

exploit_tag

Exploit-DB ↗

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-12	0.13%	0.15%	+0.03%
2	2026-05-10	0.71%	0.13%	-0.59%
3	2026-01-26	—	0.71%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-12

0.13%

0.15%

+0.03%

2026-05-10

0.71%

0.13%

-0.59%

2026-01-26

—

0.71%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.5	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	3.9	2.5	134c704f-9b21-4f2e-91b3-4a467353bcc0

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.5

3.1

MEDIUM

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

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

3.9

2.5

134c704f-9b21-4f2e-91b3-4a467353bcc0

OS Trackers for CVE-2025-3028

vendor	priority	summary	link
`alpine`	—	CVE-2025-3028: 3 source package rows (firefox, firefox-esr, thunderbird); 350 state rows across 2 repos (3.22-community, edge-community); fixed 0, open 350.	https://security.alpinelinux.org/vuln/CVE-2025-3028
`debian`	not yet assigned	CVE-2025-3028 not yet assigned priority: Debian including 3 source packages (firefox, firefox-esr, thunderbird), 11 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 11.	https://security-tracker.debian.org/tracker/CVE-2025-3028
`gentoo`	high	CVE-2025-3028: 3 GLSA(s) (202505-02, 202505-03, 202509-02), 5 atom(s) (dev-lang/spidermonkey, mail-client/thunderbird, mail-client/thunderbird-bin, www-client/firefox, www-client/firefox-bin); latest impact high.	https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2025-3028
`redhat`	high	—	https://access.redhat.com/security/cve/CVE-2025-3028
`suse`	high	CVE-2025-3028 severity important: SUSE including 40 source package names (MozillaFirefox-128.9.0-112.252.1, MozillaFirefox-128.9.0-150200.152.176.1, …), 130 product×package rows across 44 product lines (Container suse/kiosk/firefox-esr, Image SLES12-SP5-SAP-Azure-LI-BYOS-Production, … (44 product lines)): Fixed 130.	https://www.suse.com/security/cve/CVE-2025-3028/
`ubuntu`	medium	CVE-2025-3028 medium priority: Ubuntu including 9 source packages (firefox, mozjs102, …), 65 status rows across 8 suites (bionic, focal, jammy, noble, oracular, plucky, questing, upstream): DNE 35, ignored 10, not-affected 9, needs-triage 8, released 3.	https://ubuntu.com/security/CVE-2025-3028

Affected software / configurations for CVE-2025-3028

Vendor	Product	Version	Raw CPE
mozilla	firefox	< 115.22.0	cpe:2.3:a:mozilla:firefox:::::esr:::*
mozilla	firefox	< 137.0	cpe:2.3:a:mozilla:firefox:::::-:::*
mozilla	firefox	>= 116.0, < 128.9.0	cpe:2.3:a:mozilla:firefox:::::esr:::*
mozilla	thunderbird	< 128.9.0	cpe:2.3:a:mozilla:thunderbird::::::::
mozilla	thunderbird	>= 129.0, <= 137.0	cpe:2.3:a:mozilla:thunderbird::::::::

References for CVE-2025-3028

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=1941002	Exploit Permissions Required
https://www.mozilla.org/security/advisories/mfsa2025-20/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-21/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-22/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-23/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-24/	Vendor Advisory
https://lists.debian.org/debian-lts-announce/2025/04/msg00005.html

URL

CVE-2025-3028 | Use-after-free triggered by XSLTProcessor

Public exploit references (Exploit-DB) for CVE-2025-3028

Exploit prediction scoring system (EPSS) score for CVE-2025-3028

Common vulnerability scoring system (CVSS) metrics for CVE-2025-3028

Weakness enumeration for CVE-2025-3028

OS Trackers for CVE-2025-3028

Affected software / configurations for CVE-2025-3028

References for CVE-2025-3028