CVE-2025-14861Network attack vector

Arbitrary code execution via memory corruption

Published Dec 18, 2025 · Updated Dec 18, 2025

Memory corruption in Mozilla Firefox before 146.0.1 allows remote attackers to execute arbitrary code after user interaction. Mozilla identified multiple memory-safety defects in Firefox 146, but the public advisory and linked bug list do not disclose the affected code loci or invalid operations. Exploitation requires a user to process attacker-controlled content, and successful corruption grants code execution in the browser's security context.

CVSS severity8.8
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Mozilla Firefox before 146.0.1 allows remote attackers to execute arbitrary code after user interaction. Mozilla identified multiple memory-safety defects in Firefox 146, but the public advisory and linked bug list do not disclose the affected code loci or invalid operations. Exploitation requires a user to process attacker-controlled content, and successful corruption grants code execution in the browser's security context.

The record

CVE
CVE-2025-14861
Published
Dec 18, 2025
Updated
Dec 18, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-119, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 18, 2025Record 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 <146.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <146.0.1

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1203Exploitation for Client 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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