CVE-2024-7525Network attack vector

Cross-site response tampering via unchecked StreamFilter creation

Published Aug 6, 2024 · Updated Aug 6, 2024

Improper access control in StreamFilter creation in Mozilla Firefox, Firefox ESR, and Thunderbird allows attackers to read and modify any site's responses. The webRequest.filterResponseData API accepted a predictable requestId without verifying that the extension held origin permission for the destination request. The gate is a locally installed extension with minimal webRequest permissions; affected releases precede Firefox 129, Firefox ESR 115.14 or 128.1, and Thunderbird 115.14 or 128.1 on their respective branches.

CVSS severity8.1
High
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in StreamFilter creation in Mozilla Firefox, Firefox ESR, and Thunderbird allows attackers to read and modify any site's responses. The webRequest.filterResponseData API accepted a predictable requestId without verifying that the extension held origin permission for the destination request. The gate is a locally installed extension with minimal webRequest permissions; affected releases precede Firefox 129, Firefox ESR 115.14 or 128.1, and Thunderbird 115.14 or 128.1 on their respective branches.

The record

CVE
CVE-2024-7525
Published
Aug 6, 2024
Updated
Aug 6, 2024
Vendor
Mozilla
Product
Firefox
Classifications
CWE-284, CWE-276, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 6, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2024Record 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=0 <129
  2. Affected versionversion=unspecified <129

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=0 <129; version=unspecified <129
Mozilla · Thunderbirdversion=unspecified <115.14; version=unspecified <128.1
Mozilla · Firefox ESRversion=0 <115.14; version=0 <128.1; version=unspecified <115.14; version=unspecified <128.1

Published CVSS scores

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

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-284Improper Access Control
CWE-276Incorrect Default Permissions
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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