CVE-2021-45710Public exploitNetwork attack vector

Memory corruption via closed oneshot channel race

Published Dec 26, 2021 · Updated Aug 4, 2024

Race condition in Tokio 0.1.14 through 1.8.3 and 1.9.0 through 1.13.0 allows attackers to corrupt memory through a closed oneshot channel. Concurrent Sender::send and Receiver await or try_recv operations access the same shared memory after Receiver::close, violating synchronization and corrupting process state. The race requires both channel halves to remain in use after closure; code that never calls close or performs no later receive is unaffected.

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

What happened

Race condition in Tokio 0.1.14 through 1.8.3 and 1.9.0 through 1.13.0 allows attackers to corrupt memory through a closed oneshot channel. Concurrent Sender::send and Receiver await or try_recv operations access the same shared memory after Receiver::close, violating synchronization and corrupting process state. The race requires both channel halves to remain in use after closure; code that never calls close or performs no later receive is unaffected.

The record

CVE
CVE-2021-45710
Published
Dec 26, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-362, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 26, 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

5.1National Institute of Standards and TechnologyAV:N/AC:H/Au:N/C:P/I:P/A:P
8.1National Institute of Standards and TechnologyCVSS: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')
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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