5.3

CVE-2024-9398: mozilla firefox Observable Discrepancy

CVSS: 5.3v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2024-9398DEBIAN-CVE-2024-9398CGA-f38f-fj9v-2x9f
Published 01-10-2024Last modified 18-03-2025
Open JSON

Vulnerability summary

CVE-2024-9398 is a medium (CVSS 5.3) Observable Discrepancy vulnerability in mozilla firefox. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 45.8% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.57%
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 27 · Related 13
MGASA-2024-0334OPENSUSE-SU-2024:14385-1OPENSUSE-SU-2024:14394-1OPENSUSE-SU-2024:14397-1OPENSUSE-SU-2024:14572-1RHSA-2024:7552

Timeline

  1. 01-10-2024
    PublishedVulnerability first disclosed.
  2. 18-03-2025
    Last modifiedVulnerability information updated.

Description

By checking the result of calls to `window.open` with specifically set protocol handlers, an attacker could determine if the application which implements that protocol handler is installed. This vulnerability affects Firefox < 131, Firefox ESR < 128.3, Thunderbird < 128.3, and Thunderbird < 131.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.57%

Chance of exploitation in the next 30 days

Percentile

46%

Versus all other CVEs

30-day change

0.00 pp

From 0.57% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.57%

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< 131.0+build1.1-0ubuntu0.20.04.1
  • mozjs102All versions (No fix recorded)
  • mozjs115All versions (No fix recorded)
  • mozjs38All versions (No fix recorded)
  • mozjs52All versions (No fix recorded)
Mozilla3 products
  • firefox≥ unspecified, < 131 | < 128.3.0 | < 131.0
  • firefox_esr≥ unspecified, < 128.3
  • thunderbird≥ unspecified, < 128.3 | ≥ unspecified, < 131 | < 128.3 | 129.0:beta | 129.0:beta2 | 129.0:beta3 | 129.0:beta4 | 129.0:beta5 | 129.0:beta6
Chainguard2 products
  • firefox< 136.0.2-r0
  • firefox-esr< 128.3.0-r0
Debian1 product
  • thunderbird< 1:128.3.0esr-1
Wolfi1 product
  • firefox< 136.0.2-r0

5 vendors · 16 products

References

12 links
Show all 12 references