CVE-2025-5264

Local code execution via newline command injection

Published May 27, 2025 · Updated Apr 13, 2026

Command injection in affected Firefox and Thunderbird releases allows attackers to execute local code through a crafted Copy as cURL command. The Copy as cURL feature fails to escape newline characters embedded in copied request data, allowing a second shell command to enter the generated command text. Exploitation requires a user to copy the malicious request as cURL, paste it into a local command interpreter, and run it; the injected command then executes with that user's privileges.

CVSS severity4.8
Medium
EPSS probability0.29%
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 affected Firefox and Thunderbird releases allows attackers to execute local code through a crafted Copy as cURL command. The Copy as cURL feature fails to escape newline characters embedded in copied request data, allowing a second shell command to enter the generated command text. Exploitation requires a user to copy the malicious request as cURL, paste it into a local command interpreter, and run it; the injected command then executes with that user's privileges.

The record

CVE
CVE-2025-5264
Published
May 27, 2025
Updated
Apr 13, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T1059, T1204
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. May 27, 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 vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059Command and Scripting Interpreter
T1204User Execution

Public exploit references

No public exploit references are available in this record.

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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