CVE-2022-38477Network attack vector

Code execution via undisclosed memory safety defects

Published Dec 22, 2022 · Updated Apr 15, 2025

Memory corruption in Mozilla Firefox before 104, Firefox ESR before 102.2, and Thunderbird before 102.2 allows remote attackers to execute code. Mozilla does not disclose the individual code loci; NVD maps the group to out-of-bounds writes that corrupt memory while processing attacker-controlled content. Exploitation requires user interaction with crafted content; Thunderbird mail reading disables scripting, limiting its exposure to browser or browser-like contexts.

CVSS severity8.8
High
EPSS probability0.89%
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 before 104, Firefox ESR before 102.2, and Thunderbird before 102.2 allows remote attackers to execute code. Mozilla does not disclose the individual code loci; NVD maps the group to out-of-bounds writes that corrupt memory while processing attacker-controlled content. Exploitation requires user interaction with crafted content; Thunderbird mail reading disables scripting, limiting its exposure to browser or browser-like contexts.

The record

CVE
CVE-2022-38477
Published
Dec 22, 2022
Updated
Apr 15, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 22, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 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 <104

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <104
Mozilla · Thunderbirdversion=unspecified <102.2
Mozilla · Firefox ESRversion=unspecified <102.2

Published CVSS scores

8.8NVDCVSS: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 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-787Out-of-bounds Write
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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