CVE-2021-36063Network attack vector

Victim-browser script execution via isTabletDeviceHTML reflection

Published Sep 1, 2021 · Updated Sep 17, 2024

Reflected XSS in Adobe Connect 11.2.2 and earlier allows remote attackers to execute JavaScript in a victim's browser through a crafted form field. The isTabletDeviceHTML parameter is returned to a vulnerable page without neutralizing attacker-controlled script content. Exploitation requires a victim to browse to the page containing the crafted field, exposing browser-accessible data and actions to the injected script.

CVSS severity6.4
Medium
EPSS probability1.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Adobe Connect 11.2.2 and earlier allows remote attackers to execute JavaScript in a victim's browser through a crafted form field. The isTabletDeviceHTML parameter is returned to a vulnerable page without neutralizing attacker-controlled script content. Exploitation requires a victim to browse to the page containing the crafted field, exposing browser-accessible data and actions to the injected script.

The record

CVE
CVE-2021-36063
Published
Sep 1, 2021
Updated
Sep 17, 2024
Vendor
Adobe
Product
Adobe Connect
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 1, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=unspecified <=11.2.2
  2. Affected versionversion=unspecified <=None

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Adobe · Adobe Connectversion=unspecified <=11.2.2; version=unspecified <=None

Published CVSS scores

6.4AdobeCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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