CVE-2021-45680Network attack vector

Memory corruption via allocator-invalid const slice pointer

Published Dec 26, 2021 · Updated Aug 4, 2024

Memory corruption in the vec-const crate before 2.0.0 allows context-dependent attackers to corrupt memory in consuming Rust programs. The crate forges a nonempty Vec from a pointer to a const slice even though Vec ownership requires memory supplied by an allocator. Triggering requires a consuming program to instantiate the affected constant vector; subsequent Vec ownership operations act on memory the allocator does not own.

CVSS severity7.5
High
EPSS probability1.05%
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 vec-const crate before 2.0.0 allows context-dependent attackers to corrupt memory in consuming Rust programs. The crate forges a nonempty Vec from a pointer to a const slice even though Vec ownership requires memory supplied by an allocator. Triggering requires a consuming program to instantiate the affected constant vector; subsequent Vec ownership operations act on memory the allocator does not own.

The record

CVE
CVE-2021-45680
Published
Dec 26, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 26, 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

7.5GitHub Advisory DatabaseCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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