CVE-2021-28037Public exploit

Memory corruption via unconditional Sync implementation

Published Mar 5, 2021 · Updated Aug 3, 2024

A data race in the internment crate before 0.4.2 allows context-dependent attackers to corrupt memory through safe Rust APIs. The unsafe Sync implementation for Intern omits the T: Sync bound, permitting a non-Sync value to be shared and mutated concurrently. Exploitation requires a consuming program to place a T: !Sync value in Intern and access it across threads; the resulting undefined behavior can crash the process or corrupt memory.

CVSS severity9.8
Critical
EPSS probability1.17%
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 internment crate before 0.4.2 allows context-dependent attackers to corrupt memory through safe Rust APIs. The unsafe Sync implementation for Intern omits the T: Sync bound, permitting a non-Sync value to be shared and mutated concurrently. Exploitation requires a consuming program to place a T: !Sync value in Intern and access it across threads; the resulting undefined behavior can crash the process or corrupt memory.

The record

CVE
CVE-2021-28037
Published
Mar 5, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-362, T1499
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Mar 5, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8RustSecCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/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.

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1499Endpoint Denial of Service

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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