What is CVE-2021-27773?

CVE-2021-27773 is a medium-severity vulnerability in Hcl Software Sametime, classified under User Interface (UI) Misrepresentation of Critical Information. CVSS score: 4.2/10. Published 2022-05-12.

How severe is CVE-2021-27773?

Medium severity. CVSS v3 base score is 4.2 out of 10.

Vulnerability in Hcl Software Sametime

CVE-2021-27773

This vulnerability allows users to execute a clickjacking attack in the meeting's chat.

Published 2022-05-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (37.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 37.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000

Affected products

Hcl Software Sametime — versions 11.6
Hcltech Sametime — versions 11.6

Weakness classification (CWE)

References

support.hcltechsw.com/csm (Vendor Advisory)

Frequently asked questions

What is CVE-2021-27773?: CVE-2021-27773 is a medium-severity vulnerability in Hcl Software Sametime, classified under User Interface (UI) Misrepresentation of Critical Information. CVSS score: 4.2/10. Published 2022-05-12.
How severe is CVE-2021-27773?: Medium severity. CVSS v3 base score is 4.2 out of 10.