What is CVE-2021-27550?

CVE-2021-27550 is a medium-severity vulnerability in Polarisoffice Polaris Office, classified under Divide By Zero. CVSS score: 5.5/10. Published 2021-02-23.

How severe is CVE-2021-27550?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2021-27550 known to be exploited?

5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Polarisoffice Polaris Office

CVE-2021-27550

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.

Published 2021-02-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.017 (75.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 75.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Polarisoffice Polaris Office — versions 9.102.66

Weakness classification (CWE)

CWE-369 — Divide By Zero

Public proof-of-concept exploits

References

gist.github.com/sqrtrev/1f9986d4bdd1393832c60a97b56e170a (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-27550?: CVE-2021-27550 is a medium-severity vulnerability in Polarisoffice Polaris Office, classified under Divide By Zero. CVSS score: 5.5/10. Published 2021-02-23.
How severe is CVE-2021-27550?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2021-27550 known to be exploited?: 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.