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01 Record

CVE-2021-39216

Use after free passing `externref`s to Wasm in Wasmtime

MediumPUBLISHEDCNA: GitHub_M
CNA base score6.3 CVSS v3.xCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
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02 Description

Use after free passing `externref`s to Wasm in Wasmtime

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
0.30% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 23.2% of scored records. A rank, not a probability.
NVD base score
6.3 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
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
2021-09-17 20:05Z5 YR AGO
Last updated
2024-08-04 01:58Z2 YR AGO
Reserved
2021-08-16
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
Medium (CVSS 6.3)
CNA CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
Weaknesses
Data version
5.1
Document digest
234f7a1c78b461c689929ef890925196cca4e0a9d75a47e848aab77c935a7050

05 Affected products

VendorProductVersionsPlatforms
bytecodealliancewasmtime>=0.19.0, <=0.29.0—

06 References