CVE-2021-26954Network attack vector

Double-free via panic-unsafe vector insertion

Published Feb 9, 2021 · Updated Aug 3, 2024

A memory-safety vulnerability in qwutils before 0.3.1 allows remote attackers to trigger a service interrupt via a crafted Clone panic. The insert_slice_clone function uses ptr::copy while inserting into a Vec, temporarily duplicating ownership before invoking a caller-provided Clone implementation. If that Clone panics, cleanup drops the duplicated element twice; exploitation requires an application to expose this operation and supply a panicking Clone implementation.

CVSS severity5.3
Medium
EPSS probability1.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

A memory-safety vulnerability in qwutils before 0.3.1 allows remote attackers to trigger a service interrupt via a crafted Clone panic. The insert_slice_clone function uses ptr::copy while inserting into a Vec, temporarily duplicating ownership before invoking a caller-provided Clone implementation. If that Clone panics, cleanup drops the duplicated element twice; exploitation requires an application to expose this operation and supply a panicking Clone implementation.

The record

CVE
CVE-2021-26954
Published
Feb 9, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-415
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 9, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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

5.0RustSecAV:N/AC:L/Au:N/C:N/I:N/A:P
5.3RustSecCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-415Double Free

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo