CVE-2024-9395Public exploitNetwork attack vector

File-type spoofing via space-padded filenames

Published Oct 1, 2024 · Updated Nov 8, 2024

Filename spoofing in Mozilla Firefox for Android before 131 allows remote attackers to disguise a download's file extension. The Android download dialog displays attacker-supplied names with long runs of spaces without reformatting them, pushing the true suffix out of view. A user must open the download dialog for a crafted filename; the consequence is misleading file-type presentation rather than code execution.

CVSS severity5.3
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Filename spoofing in Mozilla Firefox for Android before 131 allows remote attackers to disguise a download's file extension. The Android download dialog displays attacker-supplied names with long runs of spaces without reformatting them, pushing the true suffix out of view. A user must open the download dialog for a crafted filename; the consequence is misleading file-type presentation rather than code execution.

The record

CVE
CVE-2024-9395
Published
Oct 1, 2024
Updated
Nov 8, 2024
Vendor
Mozilla
Product
Firefox
Classifications
T1655
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 1, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 8, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <131

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <131

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1655Masquerading

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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