CVE-2023-30624Network attack vector

Runtime misbehavior via aliased VMContext mutation

Published Apr 27, 2023 · Updated Jan 30, 2025

Undefined behavior in Wasmtime before 6.0.2 and versions 7.0.0 and 8.0.0 allows attackers to trigger runtime misbehavior during WebAssembly execution. The Instance allocation appends a runtime-layout VMContext, while methods taking &self mutate derived pointers that LLVM marks noalias and readonly, allowing critical writes to be removed. Known incorrect compilation requires Rust 1.70 or later with LLVM 16; official precompiled releases used LLVM 15, and the resulting security consequences remain unspecified.

CVSS severity3.9
Low
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Undefined behavior in Wasmtime before 6.0.2 and versions 7.0.0 and 8.0.0 allows attackers to trigger runtime misbehavior during WebAssembly execution. The Instance allocation appends a runtime-layout VMContext, while methods taking &self mutate derived pointers that LLVM marks noalias and readonly, allowing critical writes to be removed. Known incorrect compilation requires Rust 1.70 or later with LLVM 16; official precompiled releases used LLVM 15, and the resulting security consequences remain unspecified.

The record

CVE
CVE-2023-30624
Published
Apr 27, 2023
Updated
Jan 30, 2025
Vendor
Bytecode Alliance
Product
Wasmtime
Classifications
CWE-758
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 6.0.2
  2. Affected versionversion== 7.0.0
  3. Affected versionversion== 8.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Bytecode Alliance · Wasmtimeversion=< 6.0.2; version== 7.0.0; version== 8.0.0

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.9GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-758Reliance on Undefined, Unspecified, or Implementation-Defined Behavior

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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