CVE-2021-27550: Polaris Office v9.102.66 is affected by a divide-by-zero error in PolarisOffice.exe and EngineDLL.dll that may

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MEDIUM 5.5DOWNGRADE

CVE-2021-27550 is a medium-severity flaw (CVSS 5.5) affecting polaris office. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Polaris Office v9.102.66 is affected by a divide-by-zero error in PolarisOffice.exe and EngineDLL.dll that may cause a local denial of service. To exploit the vulnerability, someone must open a crafted PDF file.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-369
Published	2021-02-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: polarisoffice

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

Am I affected?

Timeline

2021-02-23 15:15 UTCPublished CVE record published
2026-06-17 03:45 UTCUpdated Record last modified

polarisoffice polaris office DOWNGRADE

Affected: 9.102.66

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.102.66

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 9.102.66 (Debian / Ubuntu)

apt-cache madison polaris-office sudo apt install polaris-office=<VERSION_BEFORE_9.102.66> sudo apt-mark hold polaris-office

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

dnf --showduplicates list polaris-office sudo dnf downgrade polaris-office-<VERSION_BEFORE_9.102.66> sudo dnf versionlock add polaris-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-2021-27550?

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

Is CVE-2021-27550 being exploited?

CVE-2021-27550 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-2021-27550 affect?

CVE-2021-27550 affects polaris office. Severity is medium (CVSS 5.5). Polaris Office v9.102.66 is affected by a divide-by-zero error in PolarisOffice.exe and EngineDLL.dll that may cause a local denial of service. To exploit the vulnerability, someone must open a crafted PDF file.

How urgent is CVE-2021-27550?

Priority 43/100. Public exploit reference

Related CVEs

CVE-2021-34280 HIGH 7.8 DOWNGRADE Polaris Office v9.103.83.44230 is affected by a Uninitialized Pointer Vulnerability in PolarisOffice.exe and E

References

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