CVE-2021-37378Public exploitNetwork attack vector

Stored browser script execution via Friendly Name

Published Feb 3, 2023 · Updated Mar 26, 2025

Stored cross-site scripting in Teradek Cube and Cube Pro firmware 7.3.x and earlier allows remote authenticated users to execute JavaScript. The /cgi-bin/api.cgi endpoint stores Services.Zeroconf.friendlyname content without neutralizing an embedded SVG onload handler before the System Information page renders the value. Exploitation requires an authenticated session and a victim to view the stored value; the script then runs in that browser context.

CVSS severity5.4
Medium
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Teradek Cube and Cube Pro firmware 7.3.x and earlier allows remote authenticated users to execute JavaScript. The /cgi-bin/api.cgi endpoint stores Services.Zeroconf.friendlyname content without neutralizing an embedded SVG onload handler before the System Information page renders the value. Exploitation requires an authenticated session and a victim to view the stored value; the script then runs in that browser context.

The record

CVE
CVE-2021-37378
Published
Feb 3, 2023
Updated
Mar 26, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 26, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

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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