CVE-2025-13027Network attack vector

Arbitrary code execution via undisclosed memory corruption

Published Nov 11, 2025 · Updated Nov 11, 2025

Memory safety defects in Mozilla Firefox 144 allow remote attackers to execute arbitrary code through malicious web content. Mozilla identifies four internal bug records but has not published the affected components or the unsafe operations that corrupt memory. Exposure requires a vulnerable browser to process attacker-controlled content; the published assessment requires no authentication or additional user interaction.

CVSS severity8.1
High
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

Memory safety defects in Mozilla Firefox 144 allow remote attackers to execute arbitrary code through malicious web content. Mozilla identifies four internal bug records but has not published the affected components or the unsafe operations that corrupt memory. Exposure requires a vulnerable browser to process attacker-controlled content; the published assessment requires no authentication or additional user interaction.

The record

CVE
CVE-2025-13027
Published
Nov 11, 2025
Updated
Nov 11, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-119, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 11, 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 <145

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <145

Published CVSS scores

8.1CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/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.

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

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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