CVE-2025-6434

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.28% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 20.5% of scored records. A rank, not a probability.

NVD base score

4.3 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-09-30.

Red Hat severity

Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2025-06-24 12:28Z1 YR AGO

Last updated

2026-04-13 14:31Z6 MO AGO

Reserved

2025-06-20

Assigning CNA

mozilla

Record state

PUBLISHED

Severity

Medium (CVSS 4.3)

CNA CVSS vector

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

Weaknesses

• CWE-1021Improper Restriction of Rendered UI Layers or FramesBase

Data version

5.2

Document digest

765e9c03d723a033fe349d5324dc682ec9caa15b9a93715cfe392ac110bb799e

• bugzilla.mozilla.orghttps://bugzilla.mozilla.org/show_bug.cgi?id=1955182
• www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2025-51/
• www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2025-54/