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CVE-2025-0247— Memory safety bugs fixed in Firefox 134 and Thunderbird 134

Quick assessment

Affected
Mozilla Firefox
Exploitation
High exploitation probability; assess promptly
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 134版本之前存在安全漏洞，该漏洞源于存在内存安全漏洞。

AI Predicted 8.8 Difficulty: Moderate EPSS 9.35% · P95

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
Mozilla Firefox 134≤ * unaffected
Mozilla Thunderbird 134≤ * unaffected
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I. Basic Information for CVE-2025-0247

Vulnerability Information
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Vulnerability Title
Memory safety bugs fixed in Firefox 134 and Thunderbird 134
Source: CVE Program / CVE List V5
Vulnerability Description
Memory safety bugs present in Firefox 133 and Thunderbird 133. 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 134 and Thunderbird 134.
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 134版本之前存在安全漏洞，该漏洞源于存在内存安全漏洞。
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 134 ~ * -
Mozilla Thunderbird 134 ~ * -

II. Public POCs for CVE-2025-0247

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III. Intelligence Information for CVE-2025-0247

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Vendor Advisories for CVE-2025-0247 (3)

Same Patch Batch · Mozilla · 2025-01-07 · 11 CVEs total

CVE-2025-0245 Lock screen setting bypass in Firefox Focus for Android
CVE-2025-0244 Address bar spoofing using an invalid protocol scheme on Firefox for Android
CVE-2025-0239 Alt-Svc ALPN validation failure when redirected
CVE-2025-0246 Address bar spoofing using an invalid protocol scheme on Firefox for Android
CVE-2025-0237 WebChannel APIs susceptible to confused deputy attack
CVE-2025-0238 Use-after-free when breaking lines in text
CVE-2025-0241 Memory corruption when using JavaScript Text Segmentation
CVE-2025-0240 Compartment mismatch when parsing JavaScript JSON module
CVE-2025-0243 Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and Thunderbi
CVE-2025-0242 Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 115.19, Firefox ESR

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2025-0247

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