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CVE-2025-5268— Memory safety bugs fixed in Firefox 139, Thunderbird 139, Firefox ESR 128.11, and Thunderbird 128.11

Quick assessment

Affected
Mozilla Firefox
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mozilla Firefox是美国Mozilla基金会的一款开源Web浏览器。 Mozilla Firefox 139之前版本和Firefox ESR 128.11之前版本存在安全漏洞，该漏洞源于内存损坏可能导致执行任意代码。

AI Predicted 8.5 Difficulty: Moderate EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2025-5268

Vulnerability Information
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Vulnerability Title
Memory safety bugs fixed in Firefox 139, Thunderbird 139, Firefox ESR 128.11, and Thunderbird 128.11
Source: CVE Program / CVE List V5
Vulnerability Description
Memory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 139, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Mozilla Firefox 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox是美国Mozilla基金会的一款开源Web浏览器。 Mozilla Firefox 139之前版本和Firefox ESR 128.11之前版本存在安全漏洞，该漏洞源于内存损坏可能导致执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mozilla Firefox 128.11 ~ 128.* -
Mozilla Thunderbird 128.11 ~ 128.* -

II. Public POCs for CVE-2025-5268

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III. Intelligence Information for CVE-2025-5268

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Vendor Advisories for CVE-2025-5268 (4)

Same Patch Batch · Mozilla · 2025-05-27 · 11 CVEs total

CVE-2025-5272 Memory safety bugs fixed in Firefox 139 and Thunderbird 139
CVE-2025-5270 SNI was sometimes unencrypted
CVE-2025-5271 Devtools' preview ignored CSP headers
CVE-2025-5269 Memory safety bug fixed in Firefox ESR 128.11 and Thunderbird 128.11
CVE-2025-5267 Clickjacking vulnerability could have led to leaking saved payment card details
CVE-2025-5266 Script element events leaked cross-origin resource status
CVE-2025-5264 Potential local code execution in “Copy as cURL” command
CVE-2025-5265 Potential local code execution in “Copy as cURL” command
CVE-2025-5263 Error handling for script execution was incorrectly isolated from web content
CVE-2025-5262 Mozilla Thunderbird 安全漏洞

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2025-5268

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