CVE-2021-46054Public exploit

Process crash via invalid rethrow target assertion

Published Jan 7, 2022 · Updated Aug 4, 2024

Reachable assertion in WebAssembly Binaryen 104 allows local users to crash wasm-ctor-eval by processing a crafted WebAssembly file. WasmBinaryBuilder::visitRethrow processes a rethrow targeting DELEGATE_CALLER_TARGET and reaches the curr->target != DELEGATE_CALLER_TARGET assertion while parsing function expressions. Exploitation requires a user to run wasm-ctor-eval on the crafted file and interrupts that process, with no reported confidentiality or integrity impact.

CVSS severity5.5
Medium
EPSS probability0.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in WebAssembly Binaryen 104 allows local users to crash wasm-ctor-eval by processing a crafted WebAssembly file. WasmBinaryBuilder::visitRethrow processes a rethrow targeting DELEGATE_CALLER_TARGET and reaches the curr->target != DELEGATE_CALLER_TARGET assertion while parsing function expressions. Exploitation requires a user to run wasm-ctor-eval on the crafted file and interrupts that process, with no reported confidentiality or integrity impact.

The record

CVE
CVE-2021-46054
Published
Jan 7, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 7, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.3NIST National Vulnerability DatabaseAV:N/AC:M/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-617Reachable Assertion
T1204.002User Execution: Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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