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01 Record

CVE-2023-27477

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

LowPUBLISHEDCNA: GitHub_M
CNA base score3.1 CVSS v3.xCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
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02 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

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.62% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 49.7% of scored records. A rank, not a probability.
NVD base score
4.3 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2023-03-08 00:00Z3 YR AGO
Last updated
2025-02-25 14:59Z1 YR AGO
Reserved
2023-03-01
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
Low (CVSS 3.1)
CNA CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
Weaknesses
Data version
5.1
Document digest
06888e1fa8a4d3cf588dd9b31eebabafaca9334a08804a5f040ac35b93980e67

05 Affected products

VendorProductVersionsPlatforms
bytecodealliancewasmtimecranelift-codegen: >= 0.88.0, < 0.91.1, cranelift-codegen: >= 0.92.0, < 0.92.1, cranelift-codegen: >= 0.93.0, < 0.93.1, wasmtime: >= 0.37.0, < 4.0.1, wasmtime: >= 5.0.0, < 5.0.1, wasmtime: >= 6.0.0, < 6.0.1—

06 References