CVE-2024-27527Public exploitNetwork attack vector

Runtime hang via crafted WebAssembly module

Published Nov 8, 2024 · Updated Nov 13, 2024

Denial of service in Wasm3 139076a allows remote attackers to hang the runtime by supplying a crafted WebAssembly module. The public report demonstrates that passing its proof-of-concept module to the wasm3 executable enters a blocking condition during WebAssembly validation, but it does not disclose the specific function or faulty operation that causes the loop. Execution of attacker-controlled WebAssembly is required, and the documented consequence is a persistent process hang rather than data access, modification, or a crash.

CVSS severity7.5
High
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Wasm3 139076a allows remote attackers to hang the runtime by supplying a crafted WebAssembly module. The public report demonstrates that passing its proof-of-concept module to the wasm3 executable enters a blocking condition during WebAssembly validation, but it does not disclose the specific function or faulty operation that causes the loop. Execution of attacker-controlled WebAssembly is required, and the documented consequence is a persistent process hang rather than data access, modification, or a crash.

The record

CVE
CVE-2024-27527
Published
Nov 8, 2024
Updated
Nov 13, 2024
Vendor
Wasm3 Labs
Product
Wasm3
Classifications
CWE-404, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 8, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 13, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=139076a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wasm3 Labs · Wasm3version=139076a

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

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No observations available

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

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
T1499Endpoint Denial of Service

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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