CVE-2021-29936Public exploitNetwork attack vector

Process crash via uninitialized-memory drop

Published Apr 1, 2021 · Updated Aug 3, 2024

Memory corruption in adtensor 0.0.3 and earlier allows attackers to crash consuming Rust applications through a short iterator. The Vector and Matrix FromIterator implementations allocate uninitialized storage for the type-level length, then unwrap before every element is written. Supplying fewer items than the declared size triggers a panic that drops partially uninitialized elements, causing undefined behavior and a demonstrated segmentation fault in safe Rust code.

CVSS severity9.8
Critical
EPSS probability1.33%
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 adtensor 0.0.3 and earlier allows attackers to crash consuming Rust applications through a short iterator. The Vector and Matrix FromIterator implementations allocate uninitialized storage for the type-level length, then unwrap before every element is written. Supplying fewer items than the declared size triggers a panic that drops partially uninitialized elements, causing undefined behavior and a demonstrated segmentation fault in safe Rust code.

The record

CVE
CVE-2021-29936
Published
Apr 1, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-908, 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

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
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

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-908Use of Uninitialized Resource
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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