CVE-2025-14328Public exploitNetwork attack vector

Command execution via Copy as cURL newline injection

Published Dec 9, 2025 · Updated Apr 13, 2026

Command injection in Mozilla Firefox before 146 and Thunderbird before 146 allows remote attackers to execute commands through Netmonitor. The Windows Copy as cURL formatter escapes quotes with a caret but preserves request-body tabs and line breaks, allowing crafted data to emit another command. Exploitation requires a Windows user to copy the crafted request as cURL and paste it into cmd.exe; commands then run with that user's privileges.

CVSS severity8.8
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Mozilla Firefox before 146 and Thunderbird before 146 allows remote attackers to execute commands through Netmonitor. The Windows Copy as cURL formatter escapes quotes with a caret but preserves request-body tabs and line breaks, allowing crafted data to emit another command. Exploitation requires a Windows user to copy the crafted request as cURL and paste it into cmd.exe; commands then run with that user's privileges.

The record

CVE
CVE-2025-14328
Published
Dec 9, 2025
Updated
Apr 13, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1059.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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

T1059.003Windows Command Shell

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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