CVE-2021-21948Public exploit

Heap corruption via inconsistent integer-width calculations

Published Apr 14, 2022 · Updated Apr 15, 2025

Heap overflow in CHITUBOX AnyCubic Plugin 1.0.0 and CHITUBOX Basic 1.8.1 allows attackers to corrupt memory via a crafted GF file. GfFile::readDatHeadVec truncates a header-derived multiplication to 32 bits when sizing a vector, then uses a 64-bit result for the fread length, so the file data exceeds the allocation. A user must open the file; the demonstrated consequence is a process abort from heap corruption.

CVSS severity7.8
High
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap overflow in CHITUBOX AnyCubic Plugin 1.0.0 and CHITUBOX Basic 1.8.1 allows attackers to corrupt memory via a crafted GF file. GfFile::readDatHeadVec truncates a header-derived multiplication to 32 bits when sizing a vector, then uses a 64-bit result for the fread length, so the file data exceeds the allocation. A user must open the file; the demonstrated consequence is a process abort from heap corruption.

The record

CVE
CVE-2021-21948
Published
Apr 14, 2022
Updated
Apr 15, 2025
Vendor
Anycubic
Product
CHITUBOX AnyCubic Plugin
Classifications
CWE-122, CWE-190, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Anycubic · CHITUBOX AnyCubic Pluginversion=1.0.0
Shenzhen CBD Technology Co., Ltd. · CHITUBOX Basicversion=V1.8.1

Published CVSS scores

7.8Cisco TalosCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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-122Heap-based Buffer Overflow
CWE-190Integer Overflow or Wraparound
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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