Is CVE-2025-4083 actively exploited?

No active exploitation of CVE-2025-4083 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2025-4083 be exploited remotely?

Yes. CVE-2025-4083 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2025-4083?

CVE-2025-4083 has a CVSS score of 9.1 (CRITICAL).

HOME VULNERABILITIESCVE-2025-4083

CRITICAL

CVE-2025-4083

CWE-653Published: April 29, 2025· Updated: Jun 17, 2026

9.1

CVSS v3.1

Official Description

A process isolation vulnerability in Thunderbird stemmed from improper handling of javascript: URIs, which could allow content to execute in the top-level document's process instead of the intended frame, potentially enabling a sandbox escape. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Firefox ESR 115.23, Thunderbird 138, and Thunderbird 128.10.

NVD Source

Technical Analysis

CVE-2025-4083 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 9.1.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Affected Vendors & Products

Mozilla2 product(s)

firefoxthunderbird

Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Exploit-DB

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

PacketStorm

Security advisories & exploits

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2025-28/

ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2025-29/

ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2025-30/

ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2025-31/

ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2025-32/

News & Research Mentioning CVE-2025-4083

Siemens Industrial Devices

CISA Alerts· May 14, 2026

View CSAF Summary Multiple industrial devices contain a vulnerability that could allow an attacker to cause a denial of service condition. Siemens has released new versions for several affected products and recommends to update to the latest versions. Siemens is preparing further fix versions and recommends specific countermeasures for products where fixes are not, or not yet available. The following versions of Siemens Industrial Devices are affected: IE/PB LINK HA (6GK1411-5BB00) vers:all/* (CVE-2025-40833) IE/PB link PN IO (6GK1411-5AB10) vers:all/* (CVE-2025-40833) RUGGEDCOM RM1224 LTE(4G) EU (6GK6108-4AM00-2BA2) vers:intdot/<8.3 (CVE-2025-40833) RUGGEDCOM RM1224 LTE(4G) NAM (6GK6108-4AM00-2DA2) vers:intdot/<8.3 (CVE-2025-40833) SCALANCE M804PB ( [xlite_meta score:73 src:CISA Alerts xlite_fp:794427f0145401898895103c4f6c0ed8bbe00f8964e49e9f2b5cce4ee81f68b1]