CVE-2020-36444Network attack vector

Memory corruption via unbounded ArcGuard thread traits

Published Aug 8, 2021 · Updated Aug 4, 2024

Memory corruption in the async-coap crate 0.1.0 and earlier allows remote attackers to trigger undefined behavior through ArcGuard. ArcGuard implements Send and Sync for RC without Send or Sync trait bounds, permitting non-thread-safe values to cross threads or be accessed concurrently. Exploitation requires an application path that places attacker-influenced non-thread-safe values in ArcGuard; the resulting data race can corrupt memory.

CVSS severity8.1
High
EPSS probability0.77%
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 the async-coap crate 0.1.0 and earlier allows remote attackers to trigger undefined behavior through ArcGuard. ArcGuard implements Send and Sync for RC without Send or Sync trait bounds, permitting non-thread-safe values to cross threads or be accessed concurrently. Exploitation requires an application path that places attacker-influenced non-thread-safe values in ArcGuard; the resulting data race can corrupt memory.

The record

CVE
CVE-2020-36444
Published
Aug 8, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-119, CWE-362
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

6.8NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.1NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1RustSecCVSS: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.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Public exploit references

No public exploit references are available in this record.

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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