CVE-2021-32616Network attack vector

Client-side script execution via unneutralized input

Published May 28, 2021 · Updated Aug 3, 2024

Cross-site scripting in 1CDN allows remote attackers to execute JavaScript in a user's browser through a crafted script-tag payload. The affected code is before commit f88a2730fa50fc2c2aeab09011f6f142fd90ec25; public sources do not disclose the request path, input parameter, or rendering function that fails to neutralize it. Exploitation requires user interaction and runs script in that user's 1CDN browser context, where page-accessible data and actions are exposed.

CVSS severity8.1
High
EPSS probability0.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in 1CDN allows remote attackers to execute JavaScript in a user's browser through a crafted script-tag payload. The affected code is before commit f88a2730fa50fc2c2aeab09011f6f142fd90ec25; public sources do not disclose the request path, input parameter, or rendering function that fails to neutralize it. Exploitation requires user interaction and runs script in that user's 1CDN browser context, where page-accessible data and actions are exposed.

The record

CVE
CVE-2021-32616
Published
May 28, 2021
Updated
Aug 3, 2024
Vendor
1CDN Project
Product
1CDN
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 28, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=< f88a2730fa50fc2c2aeab09011f6f142fd90ec25

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

1CDN Project · 1CDNversion=< f88a2730fa50fc2c2aeab09011f6f142fd90ec25

Published CVSS scores

8.1GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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