CVE-2025-8040Network attack vector

Code execution via Web Audio memory corruption

Published Jul 22, 2025 · Updated Apr 13, 2026

Memory corruption in Mozilla Firefox and Thunderbird 140 and their ESR 140.0 releases allows remote attackers to execute code via web content. One Web Audio path retains a raw decode-job pointer across asynchronous completion and later resizes channel data after the pointee is freed; a related path indexes unavailable shared float-buffer data. Normal browsing with user interaction is required; successful corruption can crash the application or execute attacker-controlled code in its context.

CVSS severity8.8
High
EPSS probability0.31%
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 and Thunderbird 140 and their ESR 140.0 releases allows remote attackers to execute code via web content. One Web Audio path retains a raw decode-job pointer across asynchronous completion and later resizes channel data after the pointee is freed; a related path indexes unavailable shared float-buffer data. Normal browsing with user interaction is required; successful corruption can crash the application or execute attacker-controlled code in its context.

The record

CVE
CVE-2025-8040
Published
Jul 22, 2025
Updated
Apr 13, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-119, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 22, 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 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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