CVE-2021-23414Network attack vector

Script execution via unescaped track source URL

Published Jul 28, 2021 · Updated Sep 16, 2024

Cross-site scripting in Video.js before 7.14.3 allows context-dependent attackers to execute JavaScript through a crafted track source URL. The parseUrl function's legacy browser workaround inserts the supplied URL directly into anchor markup through div.innerHTML without attribute-safe escaping. Exploitation requires an application to place attacker-controlled data in a track src attribute and a user to load the player, enabling code in the page's origin.

CVSS severity6.1
Medium
EPSS probability2.55%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Video.js before 7.14.3 allows context-dependent attackers to execute JavaScript through a crafted track source URL. The parseUrl function's legacy browser workaround inserts the supplied URL directly into anchor markup through div.innerHTML without attribute-safe escaping. Exploitation requires an application to place attacker-controlled data in a track src attribute and a user to load the player, enabling code in the page's origin.

The record

CVE
CVE-2021-23414
Published
Jul 28, 2021
Updated
Sep 16, 2024
Vendor
Video.js
Product
Video.js
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 28, 2021CVE 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=unspecified <7.14.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Video.js · Video.jsversion=unspecified <7.14.3

Published CVSS scores

6.1GitLab Advisory DatabaseCVSS: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 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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