CVE-2021-28031Public exploitNetwork attack vector

Memory corruption via panic-triggered double free

Published Mar 5, 2021 · Updated Aug 3, 2024

Double-free in move_elements in scratchpad before 1.3.1 allows attackers to corrupt memory via a panic in a user-provided closure. The function uses ptr::read to duplicate element ownership without preventing already-moved elements from being dropped during panic unwinding. Exploitation requires code to invoke the API with a closure that panics; unwinding drops the same object twice, causing undefined behavior or a process crash.

CVSS severity9.8
Critical
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

Double-free in move_elements in scratchpad before 1.3.1 allows attackers to corrupt memory via a panic in a user-provided closure. The function uses ptr::read to duplicate element ownership without preventing already-moved elements from being dropped during panic unwinding. Exploitation requires code to invoke the API with a closure that panics; unwinding drops the same object twice, causing undefined behavior or a process crash.

The record

CVE
CVE-2021-28031
Published
Mar 5, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-415
Attack vector
network
Privileges
unauthenticated

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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-415Double Free

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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