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Vulnerabilities

Vulnerability · CVE-2025-43853

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.

Published May 15, 2025 · catalog updated May 15, 2025 · The WebAssembly Micro Runtime's

Check this week

CVE-2025-43853 is not in CISA KEV. FIRST estimates a 29.00% chance of exploitation in the next 30 days. Check whether you run The WebAssembly Micro Runtime's.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (The WebAssembly Micro Runtime's).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
29.00%
Remediation
Version ranges on file
Affected products
vendor bytecodealliance wasm-micro-runtime < 2.3.0

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor bytecodealliance wasm-micro-runtime < 2.3.0< 2.3.0

How to fix CVE-2025-43853

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-43853 is not in CISA KEV. FIRST estimates a 29.00% chance of exploitation in the next 30 days. Check whether you run The WebAssembly Micro Runtime's.

Which versions are affected?

Compare what you have installed with bytecodealliance wasm-micro-runtime < 2.3.0 < 2.3.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 29.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 15, 2025 · EUVD

    Detected

    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 pre

  2. May 15, 2025 · EUVD

    Updated

    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 pre

Sources

  • CVE.orgVulnerability recordCVE-2025-43853

    Official CVE identifier

    cve.org
  • EUVDVulnerability recordEUVD-2025-28017

    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 a

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog May 15, 2025. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.