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CVE-2025-8027— JavaScript engine only wrote partial return value to stack

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等都是美国Mozilla基金会的产品。Mozilla Firefox是一款开源Web浏览器。Mozilla Firefox ESR是Firefox(Web浏览器)的一个延长支持版本。Mozilla Thunderbird是一套从Mozilla Application Suite独立出来的电子邮件客户端软件。 Mozilla多款产品存在安全漏洞，该漏洞源于IonMonkey-JIT仅写入64位返回值空间的32位，可能导致堆栈读取错误。以下产品和版本受到影响：Firefox 14

AI Predicted 8.8 Difficulty: Moderate EPSS 0.35% · P28

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2025-8027

Vulnerability Information
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Vulnerability Title
JavaScript engine only wrote partial return value to stack
Source: CVE Program / CVE List V5
Vulnerability Description
On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.
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多款产品 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox等都是美国Mozilla基金会的产品。Mozilla Firefox是一款开源Web浏览器。Mozilla Firefox ESR是Firefox(Web浏览器)的一个延长支持版本。Mozilla Thunderbird是一套从Mozilla Application Suite独立出来的电子邮件客户端软件。 Mozilla多款产品存在安全漏洞，该漏洞源于IonMonkey-JIT仅写入64位返回值空间的32位，可能导致堆栈读取错误。以下产品和版本受到影响：Firefox 14
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 115.26 ~ 115.* -
Mozilla Thunderbird 128.13 ~ 128.* -

II. Public POCs for CVE-2025-8027

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III. Intelligence Information for CVE-2025-8027

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Vendor Advisories for CVE-2025-8027 (7)

Same Patch Batch · Mozilla · 2025-07-22 · 16 CVEs total

CVE-2025-8043 Incorrect URL truncation
CVE-2025-8035 Memory safety bugs fixed in Firefox ESR 128.13, Thunderbird ESR 128.13, Firefox ESR 140.1,
CVE-2025-8044 Memory safety bugs fixed in Firefox 141 and Thunderbird 141
CVE-2025-8040 Memory safety bugs fixed in Firefox ESR 140.1, Thunderbird ESR 140.1, Firefox 141 and Thun
CVE-2025-8034 Memory safety bugs fixed in Firefox ESR 115.26, Firefox ESR 128.13, Thunderbird ESR 128.13
CVE-2025-8032 XSLT documents could bypass CSP
CVE-2025-8038 CSP frame-src was not correctly enforced for paths
CVE-2025-8033 Incorrect JavaScript state machine for generators
CVE-2025-8039 Search terms persisted in URL bar
CVE-2025-8030 Potential user-assisted code execution in “Copy as cURL” command
CVE-2025-8031 Incorrect URL stripping in CSP reports
CVE-2025-8037 Nameless cookies shadow secure cookies
CVE-2025-8028 Large branch table could lead to truncated instruction
CVE-2025-8029 javascript: URLs executed on object and embed tags
CVE-2025-8036 DNS rebinding circumvents CORS

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2025-8027

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