Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2025-43853— iwasm vulnerable to filesystem sandbox escape with symlink when using uvwasi feature

Quick assessment

Affected
bytecodealliance wasm-micro-runtime
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.

WebAssembly Micro Runtime（WAMR）是Bytecode Alliance开源的一种轻量级的独立 WebAssembly 运行时。具有占用空间小、高性能和高度可配置的功能，适用于从嵌入式、物联网、边缘到可信执行环境 (TEE)、智能合约、云原生等应用程序。 WebAssembly Micro Runtime 2.2.0及之前版本存在安全漏洞，该漏洞源于符号链接跟随漏洞，可能导致在沙箱外创建或读取文件。

AI Predicted 8.1 Difficulty: Moderate EPSS 0.28% · P19
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2025-43853

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
iwasm vulnerable to filesystem sandbox escape with symlink when using uvwasi feature
Source: CVE Program / CVE List V5
Vulnerability Description
The WebAssembly Micro Runtime's (WAMR) iwasm package is the executable binary built with WAMR VMcore which supports WebAssembly System Interface (WASI) and command line interface. Anyone running WAMR up to and including version 2.2.0 or WAMR built with libc-uvwasi on Windows is affected by a symlink following vulnerability. On WAMR running in Windows, creating a symlink pointing outside of the preopened directory and subsequently opening it with create flag will create a file on host outside of the sandbox. If the symlink points to an existing host file, it's also possible to open it and read its content. Version 2.3.0 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-61
Source: CVE Program / CVE List V5
Vulnerability Title
WebAssembly Micro Runtime 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WebAssembly Micro Runtime（WAMR）是Bytecode Alliance开源的一种轻量级的独立 WebAssembly 运行时。具有占用空间小、高性能和高度可配置的功能，适用于从嵌入式、物联网、边缘到可信执行环境 (TEE)、智能合约、云原生等应用程序。 WebAssembly Micro Runtime 2.2.0及之前版本存在安全漏洞，该漏洞源于符号链接跟随漏洞，可能导致在沙箱外创建或读取文件。
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
bytecodealliance wasm-micro-runtime < 2.3.0 -

II. Public POCs for CVE-2025-43853

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2025-43853

请登录查看更多情报信息。

IV. Related Vulnerabilities

Same product: wasm-micro-runtime
Same vendor: bytecodealliance
Same weakness: CWE-61

V. Comments for CVE-2025-43853

No comments yet

Leave a comment