CVE-2023-42131: Ansys SpaceClaim X_B File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability

Routine

HIGH 7.8DOWNGRADE

CVE-2023-42131 is a high-severity flaw (CVSS 7.8) affecting spaceclaim. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Ansys SpaceClaim X_B File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Ansys SpaceClaim. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of X_B files. The issue results from the lack of proper validation

Why this priority

High severity

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	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-787
Published	2024-05-03
Last modified	2026-06-17

Publisher (CNA): Zero Day Initiative · Vendor: ansys

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

Am I affected?

Timeline

2024-05-03 03:15 UTCPublished CVE record published
2026-06-17 06:23 UTCUpdated Record last modified

ansys spaceclaim DOWNGRADE

Affected: 2022 r1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2022

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2022 (Debian / Ubuntu)

apt-cache madison spaceclaim sudo apt install spaceclaim=<VERSION_BEFORE_2022> sudo apt-mark hold spaceclaim

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

dnf --showduplicates list spaceclaim sudo dnf downgrade spaceclaim-<VERSION_BEFORE_2022> sudo dnf versionlock add spaceclaim

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-2023-42131?

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

Is CVE-2023-42131 being exploited?

CVE-2023-42131 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-2023-42131 affect?

CVE-2023-42131 affects spaceclaim. Severity is high (CVSS 7.8). Ansys SpaceClaim X_B File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Ansys SpaceClaim. User interaction is required to e

How urgent is CVE-2023-42131?

Priority 36/100. High severity

References

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