CVE-2023-37208Public exploit

Code execution via unwarned Diagcab launch

Published Jul 5, 2023 · Updated Nov 20, 2024

Unsafe file handling in Firefox before 115, Firefox ESR before 102.13, and Thunderbird before 102.13 allows attackers to run code. The file-handling dangerous-extension list omitted .diagcab, so opening a downloaded cabinet invoked the Windows diagnostics wizard without an executable-file warning. A user must open the crafted file, after which its diagnostic package can execute code with that user's privileges on the host.

CVSS severity7.8
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe file handling in Firefox before 115, Firefox ESR before 102.13, and Thunderbird before 102.13 allows attackers to run code. The file-handling dangerous-extension list omitted .diagcab, so opening a downloaded cabinet invoked the Windows diagnostics wizard without an executable-file warning. A user must open the crafted file, after which its diagnostic package can execute code with that user's privileges on the host.

The record

CVE
CVE-2023-37208
Published
Jul 5, 2023
Updated
Nov 20, 2024
Vendor
Mozilla
Product
Firefox
Classifications
CWE-434, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 5, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 20, 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=unspecified <115

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <115
Mozilla · Thunderbirdversion=unspecified <102.13
Mozilla · Firefox ESRversion=unspecified <102.13

Published CVSS scores

7.8NVDCVSS:3.1/AV:L/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1204.002Malicious File

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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