CVE-2023-25734

Name: CVE-2023-25734
Creator: NVD / NIST
Published: 2023-06-02T17:15:11.237+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 0.78%

Last modified Jun 17, 2026

CVE-2023-25734 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. After downloading a Windows <code>.url</code> shortcut from the local filesystem, an attacker could supply a remote path that would lead to unexpected network requests from the operating system. This also had the potential to leak NTLM credentials to the resource.<br>*This bug only affects Firefox on Windows. EPSS estimates a 0.78% chance of exploitation in the next 30 days.

Description

After downloading a Windows <code>.url</code> shortcut from the local filesystem, an attacker could supply a remote path that would lead to unexpected network requests from the operating system. This also had the potential to leak NTLM credentials to the resource.<br>*This bug only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability affects Firefox < 110, Thunderbird < 102.8, and Firefox ESR < 102.8.

Metrics

CVSS 3.1

8.1/10

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

EPSS Probability

0.78%

51.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-601

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 110.0
Mozilla	Firefox Esr	< 102.8
Mozilla	Thunderbird	< 102.8

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1784451Exploit, Issue Tracking, Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1809923Issue Tracking, Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1810143Issue Tracking, Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1812338Issue Tracking, Permissions Required
https://www.mozilla.org/security/advisories/mfsa2023-05/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-06/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-07/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1784451Exploit, Issue Tracking, Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1809923Issue Tracking, Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1810143Issue Tracking, Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1812338Issue Tracking, Permissions Required
https://www.mozilla.org/security/advisories/mfsa2023-05/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-06/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-07/Vendor Advisory

Timeline

Published: Jun 2, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-25734?

How severe is CVE-2023-25734?

CVE-2023-25734 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 0.78% probability of exploitation in the next 30 days.

How do I fix CVE-2023-25734?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-25734?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST