CVE-2021-42614Public exploit

Document processor crash via freed token text

Published May 24, 2022 · Updated Aug 4, 2024

Use-after-free in Halibut 1.2 allows local users to crash the document processor by opening a crafted text document. During tokenization, get_token frees resource text on brace and pushback paths, while the Info backend later traverses stale word data in info_width_internal. The published proof of concept requires the crafted file to be processed with the Info backend and ends in a segmentation fault; other impact remains unspecified.

CVSS severity7.8
High
EPSS probability0.87%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Halibut 1.2 allows local users to crash the document processor by opening a crafted text document. During tokenization, get_token frees resource text on brace and pushback paths, while the Info backend later traverses stale word data in info_width_internal. The published proof of concept requires the crafted file to be processed with the Info backend and ends in a segmentation fault; other impact remains unspecified.

The record

CVE
CVE-2021-42614
Published
May 24, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 24, 2022CVE 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 vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1204.002Malicious File

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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