CVE-2021-27773Network attack vector

Unintended chat actions via clickjacking

Published May 12, 2022 · Updated Sep 16, 2024

Clickjacking in HCL Sametime 11.6 allows remote attackers to trigger unintended actions in a meeting chat through a deceptive interface. HCL has not published the affected handler, missing browser control, or other code-level operation that permits the interface to be framed or misrepresented. Exploitation requires a user to interact with attacker-controlled content; HCL has not identified the specific chat data exposed or actions altered.

CVSS severity4.3
Medium
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Clickjacking in HCL Sametime 11.6 allows remote attackers to trigger unintended actions in a meeting chat through a deceptive interface. HCL has not published the affected handler, missing browser control, or other code-level operation that permits the interface to be framed or misrepresented. Exploitation requires a user to interact with attacker-controlled content; HCL has not identified the specific chat data exposed or actions altered.

The record

CVE
CVE-2021-27773
Published
May 12, 2022
Updated
Sep 16, 2024
Vendor
HCL Software
Product
HCL Sametime
Classifications
CWE-1021, CWE-451
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 12, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=11.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

HCL Software · HCL Sametimeversion=11.6

Published CVSS scores

4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
4.2HCL SoftwareCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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