CVE-2021-29931

Heap corruption via panic-triggered double drop

Published Apr 1, 2021 · Updated Aug 3, 2024

Double free in arenavec 0.1.1 and earlier allows attackers to corrupt heap memory by triggering a panic in a user-defined destructor. The common::SliceVec<T, H>::resize() and resize_with() paths invoke T::drop() without guarding panic cleanup, causing the same element to be dropped twice. Reachability depends on a consuming Rust program using a type whose destructor can panic; successful triggering corrupts the process heap and can interrupt its service.

CVSS severity7.5
High
EPSS probability0.97%
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 arenavec 0.1.1 and earlier allows attackers to corrupt heap memory by triggering a panic in a user-defined destructor. The common::SliceVec<T, H>::resize() and resize_with() paths invoke T::drop() without guarding panic cleanup, causing the same element to be dropped twice. Reachability depends on a consuming Rust program using a type whose destructor can panic; successful triggering corrupts the process heap and can interrupt its service.

The record

CVE
CVE-2021-29931
Published
Apr 1, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-415, T1499.004
Attack vector
Unavailable
Privileges
Unavailable

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 vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5RustSec Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS: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.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-415Double Free
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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