CVE-2021-21948: A heap-based buffer overflow vulnerability exists in the readDatHeadVec functionality of AnyCubic Chitubox Any

This month

HIGH 7.8DOWNGRADEDOWNGRADE

CVE-2021-21948 is a high-severity flaw (CVSS 7.8) affecting chitubox basic, chitubox. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A heap-based buffer overflow vulnerability exists in the readDatHeadVec functionality of AnyCubic Chitubox AnyCubic Plugin 1.0.0. A specially-crafted GF file can lead to a heap buffer overflow. An attacker can provide a malicious file to trigger this vulnerability.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 44%)
CISA exploited list	No
Weakness	CWE-122, CWE-190
Published	2022-04-14
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: anycubic · chitubox

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-04-14 20:15 UTCPublished CVE record published
2026-06-17 03:36 UTCUpdated Record last modified

chitubox chitubox basic DOWNGRADE

Affected: 1.8.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.8.1

1. Check installed version

apt-cache policy chitubox-basic || rpm -q chitubox-basic || chitubox-basic --version

2. No fixed release: DOWNGRADE to a release before 1.8.1 (Debian / Ubuntu)

apt-cache madison chitubox-basic sudo apt install chitubox-basic=<VERSION_BEFORE_1.8.1> sudo apt-mark hold chitubox-basic

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list chitubox-basic sudo dnf downgrade chitubox-basic-<VERSION_BEFORE_1.8.1> sudo dnf versionlock add chitubox-basic

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

anycubic chitubox DOWNGRADE

Affected: 1.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0

1. Check installed version

apt-cache policy chitubox || rpm -q chitubox || chitubox --version

2. No fixed release: DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison chitubox sudo apt install chitubox=<VERSION_BEFORE_1.0.0> sudo apt-mark hold chitubox

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list chitubox sudo dnf downgrade chitubox-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add chitubox

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-21948?

chitubox basic: downgrade or apply the listed mitigation; chitubox: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-21948 being exploited?

CVE-2021-21948 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-21948 affect?

CVE-2021-21948 affects chitubox basic, chitubox. Severity is high (CVSS 7.8). A heap-based buffer overflow vulnerability exists in the readDatHeadVec functionality of AnyCubic Chitubox AnyCubic Plugin 1.0.0. A specially-crafted GF file can lead to a heap buffer overflow. An attacker can provide a malicious file to tr

How urgent is CVE-2021-21948?

Priority 46/100. High severity; Public exploit reference

References

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