What is CVE-2021-45946?

CVE-2021-45946 is a medium-severity vulnerability in Wasm3 Project, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2022-01-01.

How severe is CVE-2021-45946?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Buffer overflow in Wasm3 Project

CVE-2021-45946

Wasm3 0.5.0 has an out-of-bounds write in CompileBlock (called from Compile_LoopOrBlock and CompileBlockStatements).

Vulnerability class: Buffer Overflow

Published 2022-01-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.007 (49.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Wasm3 Project — versions 0.5.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/google/oss-fuzz-vulns/blob/main/vulns/wasm3/OSV-2021-678.yaml (Third Party Advisory)
bugs.chromium.org/p/oss-fuzz/issues/detail (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-45946?: CVE-2021-45946 is a medium-severity vulnerability in Wasm3 Project, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2022-01-01.
How severe is CVE-2021-45946?: Medium severity. CVSS v3 base score is 5.5 out of 10.