// For flags

CVE-2025-4918

firefox: thunderbird: Out-of-bounds access when resolving Promise objects

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track*
*SSVC
Descriptions

An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object. This vulnerability affects Firefox ESR < 115.23.1.

An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object. This vulnerability affects Firefox < 138.0.4, Firefox ESR < 128.10.1, Firefox ESR < 115.23.1, Thunderbird < 128.10.2, and Thunderbird < 138.0.2.

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object.

An update for thunderbird is now available for Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions. Issues addressed include code execution, out of bounds access, and script execution vulnerabilities.

*Credits: Edouard Bochin and Tao Yan from Palo Alto Networks working with Trend Micro's Zero Day Initiative
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:Track*
Exploitation
None
Automatable
No
Tech. Impact
Total
* Organization's Worst-case Scenario
Timeline
  • 2025-05-17 CVE Reserved
  • 2025-05-17 CVE Published
  • 2025-05-22 CVE Updated
  • 2025-05-29 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-125: Out-of-bounds Read
  • CWE-787: Out-of-bounds Write
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Mozilla
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 Firefox
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*-
Affected
Mozilla
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 Firefox Esr
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*-
Affected
Mozilla
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 Thunderbird
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*-
Affected
Oracle
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 Linux
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*-
Affected
Redhat
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 Enterprise Linux
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Affected
Alma
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 Linux
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Affected
Debian
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 Debian Linux
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Affected
Freebsd
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 Freebsd
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Affected
Oracle
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 Linux
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Affected
Redhat
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 Enterprise Linux
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Affected
Redhat
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 Rhel Eus
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Affected
Slackware
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 Slackware Linux
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Affected