Is CVE-2023-27477 actively exploited?

CVE-2023-27477 has no public evidence of in-the-wild exploitation as of 2024-11-21.

What is the CVSS score for CVE-2023-27477?

CVE-2023-27477 has a CVSS score of 3.1 (LOW severity). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N.

How do I patch CVE-2023-27477?

Patch guidance is available from bytecodealliance security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2023-27477.

CVE-2023-27477 - remediation guidance & executive summary

Q: Which products are affected by CVE-2023-27477?

6 products: bytecodealliance cranelift-codegen, bytecodealliance cranelift-codegen, bytecodealliance cranelift-codegen, bytecodealliance wasmtime, bytecodealliance wasmtime, and 1 more.

Description

wasmtime is a fast and secure runtime for WebAssembly. Wasmtime's code generation backend, Cranelift, has a bug on x86_64 platforms for the WebAssembly `i8x16.select` instruction which will produce the wrong results when the same operand is provided to the instruction and some of the selected indices are greater than 16. There is an off-by-one error in the calculation of the mask to the `pshufb` instruction which causes incorrect results to be returned if lanes are selected from the second vector. This codegen bug has been fixed in Wasmtiem 6.0.1, 5.0.1, and 4.0.1. Users are recommended to upgrade to these updated versions. If upgrading is not an option for you at this time, you can avoid this miscompilation by disabling the Wasm simd proposal. Additionally the bug is only present on x86_64 hosts. Other platforms such as AArch64 and s390x are not affected.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack Vector: network
Complexity: high
Privileges: low
User Action: none
Scope: unchanged
Confidentiality: none
Integrity: low
Availability: none
Weaknesses: CWE-193

Metadata

Primary Vendor: BYTECODEALLIANCE
Published: 3/8/2023
Last Modified: 11/21/2024
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

bytecodealliance : cranelift-codegenbytecodealliance : cranelift-codegenbytecodealliance : cranelift-codegenbytecodealliance : wasmtimebytecodealliance : wasmtimebytecodealliance : wasmtime

Remediation Guidance

Executive Summary

Cite this page

CVE-2023-27477. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2023-27477

View on NIST NVD

CVE-2023-27477 vulnerability