CVE-2021-27772

Name: CVE-2021-27772
Creator: NVD / NIST
Published: 2022-05-12T22:15:11.943+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.62%

Last modified Jun 17, 2026

CVE-2021-27772 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Users are able to read group conversations without actively taking part in them. Next to one to one conversations, users are able to start group conversations with multiple users. EPSS estimates a 0.62% chance of exploitation in the next 30 days.

Description

Users are able to read group conversations without actively taking part in them. Next to one to one conversations, users are able to start group conversations with multiple users. It was found possible to obtain the contents of these group conversations without being part of it. This could lead to information leakage where confidential information discussed in private groups is read by other users without the users knowledge.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

0.62%

45.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-285

Affected Software

Vendor	Product	Versions
Hcltech	Sametime	11.6

References

https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0097430Vendor Advisory
https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0097430Vendor Advisory

Timeline

Published: May 12, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-27772?

How severe is CVE-2021-27772?

CVE-2021-27772 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.62% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27772?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-27772?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST