CVE-2021-29929Public exploitNetwork attack vector

Heap corruption via panic-triggered double drop

Published Apr 1, 2021 · Updated Aug 3, 2024

Double free in endian_trait 0.6.0 and earlier allows attackers to corrupt heap memory when a user-provided Endian implementation panics. The mutable-slice Endian methods use ptr::read() to duplicate ownership of each element before calling the trait method, without guarding panic unwinding. Reachability requires a consuming application to execute an attacker-influenced Endian implementation that panics; the demonstrated consequence is heap corruption and a process crash.

CVSS severity7.5
High
EPSS probability1.14%
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 endian_trait 0.6.0 and earlier allows attackers to corrupt heap memory when a user-provided Endian implementation panics. The mutable-slice Endian methods use ptr::read() to duplicate ownership of each element before calling the trait method, without guarding panic unwinding. Reachability requires a consuming application to execute an attacker-influenced Endian implementation that panics; the demonstrated consequence is heap corruption and a process crash.

The record

CVE
CVE-2021-29929
Published
Apr 1, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-415, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 1, 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

7.5RustSecCVSS:3.1/AV:N/AC:L/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.

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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-415Double Free
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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