CVE-2020-36220Public exploitNetwork attack vector

Memory corruption via unchecked cross-thread type transfer

Published Jan 22, 2021 · Updated Aug 4, 2024

Memory-safety flaw in va-ts before 0.0.4 allows attackers to cause memory corruption by moving a non-Send value across threads. Demuxer unconditionally implements Send without requiring T: Send, so it defeats Rust's type-system restriction on transferring thread-unsafe values. Exploitation requires a consuming application to place such a value in Demuxer and move it between threads, resulting in a data race or an invalid cross-thread mutex unlock.

CVSS severity5.9
Medium
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory-safety flaw in va-ts before 0.0.4 allows attackers to cause memory corruption by moving a non-Send value across threads. Demuxer unconditionally implements Send without requiring T: Send, so it defeats Rust's type-system restriction on transferring thread-unsafe values. Exploitation requires a consuming application to place such a value in Demuxer and move it between threads, resulting in a data race or an invalid cross-thread mutex unlock.

The record

CVE
CVE-2020-36220
Published
Jan 22, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-667, CWE-787, 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

5.9NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
5.9RustSecCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
5.9GitHubCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-667Improper Locking
CWE-787Out-of-bounds Write
CWE-662Improper Synchronization
T1499.004Application or System Exploitation

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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