CVE-2025-1938Network attack vector

Arbitrary code execution via memory corruption

Published Mar 4, 2025 · Updated Apr 13, 2026

Memory-safety defects in Firefox and Thunderbird 135 and ESR 128.7 allow attackers to execute arbitrary code through memory corruption. Mozilla groups five undisclosed bugs under this CVE and reports only that some produced memory corruption; the affected code loci and faulty operations are not public. The trigger and required interaction are undisclosed, while Thunderbird notes that mail reading disables scripting and limits exploitation through email.

CVSS severity6.5
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory-safety defects in Firefox and Thunderbird 135 and ESR 128.7 allow attackers to execute arbitrary code through memory corruption. Mozilla groups five undisclosed bugs under this CVE and reports only that some produced memory corruption; the affected code loci and faulty operations are not public. The trigger and required interaction are undisclosed, while Thunderbird notes that mail reading disables scripting and limits exploitation through email.

The record

CVE
CVE-2025-1938
Published
Mar 4, 2025
Updated
Apr 13, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 4, 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

8.8OracleCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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-787Out-of-bounds Write

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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