CVE-2020-36218Network attack vector

Undefined behavior via unconditional Send and Sync

Published Jan 22, 2021 · Updated Aug 4, 2024

Improper synchronization in the buttplug crate before 1.0.4 allows remote attackers to cause undefined behavior through concurrent use. ButtplugFutureStateShared implements Send and Sync without requiring T to implement those traits, so non-Send values cross thread boundaries and non-Sync values are shared concurrently. The condition requires a consuming application to use such a value across threads; execution then enters undefined behavior, including a data race and loss of availability.

CVSS severity5.9
Medium
EPSS probability1.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper synchronization in the buttplug crate before 1.0.4 allows remote attackers to cause undefined behavior through concurrent use. ButtplugFutureStateShared implements Send and Sync without requiring T to implement those traits, so non-Send values cross thread boundaries and non-Sync values are shared concurrently. The condition requires a consuming application to use such a value across threads; execution then enters undefined behavior, including a data race and loss of availability.

The record

CVE
CVE-2020-36218
Published
Jan 22, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-662, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 22, 2021CVE 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.9GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
5.9RustSec Advisory DatabaseCVSS:3.1/AV:N/AC:H/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-662Improper Synchronization
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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