HCL Sametime is vulnerable to clickjacking

published 2022-05-12 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-14514

cvss: 4.2; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits: 0; none known

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

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.2	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
NVD	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

HCL Software Sametime

Classification

Weakness

CWE-451 User Interface (UI) Misrepresentation of Critical Information
CWE-1021 Improper Restriction of Rendered UI Layers or Frames

References

support.hcltechsw.com /csm?id=kb_article&sysparm_article=KB0097430
vendor-advisory

Sources

CVE List CVE-2021-27773
NVD CVE-2021-27773

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary