CVE-2020-36460Public exploitNetwork attack vector

Undefined behavior via unconstrained Shared thread-safety traits

Published Aug 8, 2021 · Updated Aug 4, 2024

A data race in the Rust model crate 0.1.2 and earlier allows attackers to trigger undefined behavior through concurrent Shared use. Shared unconditionally implements the unsafe Send and Sync traits, even when T is not thread-safe, so safe code can share mutable state across threads without synchronization. Exploitation requires consuming code to place a non-Send or non-Sync inner value in Shared and access it concurrently; the published demonstration corrupts a pointer and crashes the process.

CVSS severity8.1
High
EPSS probability1.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A data race in the Rust model crate 0.1.2 and earlier allows attackers to trigger undefined behavior through concurrent Shared use. Shared unconditionally implements the unsafe Send and Sync traits, even when T is not thread-safe, so safe code can share mutable state across threads without synchronization. Exploitation requires consuming code to place a non-Send or non-Sync inner value in Shared and access it concurrently; the published demonstration corrupts a pointer and crashes the process.

The record

CVE
CVE-2020-36460
Published
Aug 8, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-362, CWE-843
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

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.1NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1RustSec Advisory DatabaseCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-843Access of Resource Using Incompatible Type ('Type Confusion')

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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