What is CVE-2021-39219?

CVE-2021-39219 is a medium-severity vulnerability in Bytecodealliance Wasmtime, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 6.3/10. Published 2021-09-17.

How severe is CVE-2021-39219?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Is CVE-2021-39219 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Bytecodealliance Wasmtime

CVE-2021-39219

Wasmtime is an open source runtime for WebAssembly & WASI. Wasmtime before version 0.30.0 is affected by a type confusion vulnerability. As a Rust library the `wasmtime` crate clearly marks which functions are safe and which are `unsafe`…

EPSS: 0.001 (22.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H.

Affected products

Bytecodealliance Wasmtime — versions <= 0.29.0

Weakness classification (CWE)

CWE-843 — Access of Resource Using Incompatible Type (Type Confusion)

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

crates.io/crates/wasmtime (x_refsource_MISC)
github.com/bytecodealliance/wasmtime/security/advisories/GHSA-q879-9g95-56mx (x_refsource_CONFIRM)
github.com/bytecodealliance/wasmtime/commit/b39f087414f27ae40c44449ed5d1154e034… (x_refsource_MISC)
FEDORA-2021-68713440cb (vendor-advisory, x_refsource_FEDORA)
FEDORA-2021-1805eacb48 (vendor-advisory, x_refsource_FEDORA)

Frequently asked questions

What is CVE-2021-39219?: CVE-2021-39219 is a medium-severity vulnerability in Bytecodealliance Wasmtime, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 6.3/10. Published 2021-09-17.
How severe is CVE-2021-39219?: Medium severity. CVSS v3 base score is 6.3 out of 10.
Is CVE-2021-39219 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.