CVE-2025-8035Public exploitNetwork attack vector

Code execution via primary-frame type confusion

Published Jul 22, 2025 · Updated Apr 13, 2026

Memory corruption in Mozilla Firefox and Thunderbird allows remote attackers to execute code through crafted web content. A missing null check in GetPrimaryFrame returns a union's mSubtreeRootPointer and treats that element pointer as a frame, causing an out-of-bounds read during focus traversal. Exploitation requires user interaction with crafted content; the public testcase demonstrates a crash, while Mozilla identifies arbitrary code execution as the presumed upper impact.

CVSS severity8.8
High
EPSS probability0.34%
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 allows remote attackers to execute code through crafted web content. A missing null check in GetPrimaryFrame returns a union's mSubtreeRootPointer and treats that element pointer as a frame, causing an out-of-bounds read during focus traversal. Exploitation requires user interaction with crafted content; the public testcase demonstrates a crash, while Mozilla identifies arbitrary code execution as the presumed upper impact.

The record

CVE
CVE-2025-8035
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.

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

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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