CVE-2020-36215Public exploitNetwork attack vector

Memory corruption via unconstrained Send and Sync implementations

Published Jan 22, 2021 · Updated Aug 4, 2024

Memory corruption in Rust hashconsing before 1.1.0 allows context-dependent attackers to crash concurrent programs via shared non-Sync values. HConsed unconditionally implements Send and Sync for every contained type, allowing thread-unsafe values such as Cell to cross thread boundaries and create data races. Reachability requires a consuming program to place such a value in HConsed and use it concurrently; the demonstrated result is a segmentation fault from safe Rust code.

CVSS severity7.5
High
EPSS probability1.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Rust hashconsing before 1.1.0 allows context-dependent attackers to crash concurrent programs via shared non-Sync values. HConsed unconditionally implements Send and Sync for every contained type, allowing thread-unsafe values such as Cell to cross thread boundaries and create data races. Reachability requires a consuming program to place such a value in HConsed and use it concurrently; the demonstrated result is a segmentation fault from safe Rust code.

The record

CVE
CVE-2020-36215
Published
Jan 22, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, CWE-662
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

7.5RustSecCVSS: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-787Out-of-bounds Write
CWE-662Improper Synchronization

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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