CVE-2020-36454Public exploitNetwork attack vector

Memory corruption via unsound LockWeak Send implementation

Published Aug 8, 2021 · Updated Aug 4, 2024

Data race in the parc crate 1.0.1 and earlier allows attackers to trigger undefined behavior by sharing a non-Sync value across threads. LockWeak unconditionally implements Send without requiring T: Sync, so safe code can move its weak reference between threads and concurrently access the underlying T. Exploitation requires a consuming program to wrap a non-Sync value in ParentArc and exercise concurrent ChildArc access; demonstrated outcomes include a memory leak or process crash.

CVSS severity8.1
High
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Data race in the parc crate 1.0.1 and earlier allows attackers to trigger undefined behavior by sharing a non-Sync value across threads. LockWeak unconditionally implements Send without requiring T: Sync, so safe code can move its weak reference between threads and concurrently access the underlying T. Exploitation requires a consuming program to wrap a non-Sync value in ParentArc and exercise concurrent ChildArc access; demonstrated outcomes include a memory leak or process crash.

The record

CVE
CVE-2020-36454
Published
Aug 8, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-362, CAPEC-26
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 8, 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

8.1NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/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.

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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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CAPEC-26Leveraging Race Conditions

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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