CVE-2021-40399: An exploitable use-after-free vulnerability exists in WPS Spreadsheets ( ET ) as part of WPS Office, version 1

This month

HIGH 7.8DOWNGRADE

CVE-2021-40399 is a high-severity flaw (CVSS 7.8) affecting wps office. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An exploitable use-after-free vulnerability exists in WPS Spreadsheets ( ET ) as part of WPS Office, version 11.2.0.10351. A specially-crafted XLS file can cause a use-after-free condition, resulting in remote code execution. An attacker needs to provide a malformed file to the victim to trigger the vulnerability.

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	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-416
Published	2022-05-12
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: wps

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

Am I affected?

Timeline

2022-05-12 17:15 UTCPublished CVE record published
2026-06-17 04:06 UTCUpdated Record last modified

wps wps office DOWNGRADE

Affected: 11.2.0.10351

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.2.0.10351

1. Check installed version

apt-cache policy wps-office || rpm -q wps-office || wps-office --version

2. No fixed release: DOWNGRADE to a release before 11.2.0.10351 (Debian / Ubuntu)

apt-cache madison wps-office sudo apt install wps-office=<VERSION_BEFORE_11.2.0.10351> sudo apt-mark hold wps-office

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

dnf --showduplicates list wps-office sudo dnf downgrade wps-office-<VERSION_BEFORE_11.2.0.10351> sudo dnf versionlock add wps-office

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-2021-40399?

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

Is CVE-2021-40399 being exploited?

CVE-2021-40399 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-2021-40399 affect?

CVE-2021-40399 affects wps office. Severity is high (CVSS 7.8). An exploitable use-after-free vulnerability exists in WPS Spreadsheets ( ET ) as part of WPS Office, version 11.2.0.10351. A specially-crafted XLS file can cause a use-after-free condition, resulting in remote code execution. An attacker ne

How urgent is CVE-2021-40399?

Priority 45/100. High severity

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References

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