4.3

CVE-2025-1019: mozilla firefox

CVSS: 4.3v3.1MediumModified
AliasesUBUNTU-CVE-2025-1019CGA-3549-v4hp-6v8xCGA-p59w-434w-x487
Published 04-02-2025Last modified 13-04-2026
Open JSON

Vulnerability summary

CVE-2025-1019 is a medium (CVSS 4.3) vulnerability in mozilla firefox. EPSS estimates a 0.36% chance of exploitation in the next 30 days, higher than 28.5% of scored vulnerabilities.

Overall risk
17/100
0100
Low · default modelHow is this calculated?
CVSS score
4.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.36%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 6
OPENSUSE-SU-2025:14730-1OPENSUSE-SU-2026:11373-1USN-7263-1CGA-JQ25-8437-8MPGCGA-XG7G-43HJ-MM6HUSN-7991-1

Timeline

  1. 04-02-2025
    PublishedVulnerability first disclosed.
  2. 13-04-2026
    Last modifiedVulnerability information updated.

Description

The z-order of the browser windows could be manipulated to hide the fullscreen notification. This could potentially be leveraged to perform a spoofing attack. This vulnerability was fixed in Firefox 135 and Thunderbird 135.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.36%

Chance of exploitation in the next 30 days

Percentile

29%

Versus all other CVEs

30-day change

0.00 pp

From 0.36% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.36%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu9 products
  • firefox< 135.0+build2-0ubuntu0.20.04.1
  • mozjs102All versions (No fix recorded)
  • mozjs115All versions (No fix recorded)
  • mozjs38All versions (No fix recorded)
  • mozjs52All versions (No fix recorded)
Chainguard2 products
  • firefox< 135.0-r0
  • firefox-esr< 135-r0
Mozilla2 products
Wolfi1 product
  • firefox< 135.0-r0

4 vendors · 14 products

References

8 links