CVE-2021-23414

mediumpriority · track · 25EPSS 0.025 · 85 %ileDEEUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
2.55% (85th) EPSS
CVSS 4.3 · medium
Is it mine?
10 products
Check your exposure
Who says so?
6 sources
cnnvd · enisa_euvd · cisa_csaf_ot · festo_psirt

EPSS · scored 2026-10-27

This affects the package video.js before 7.14.3. The src attribute of track tag allows to bypass HTML escaping and execute arbitrary code.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • FixedLX Appliancefesto_psirt

    Contact Festo Didactic services department at services.didactic@festo.com to update your LX Appliance to the latest version.

  • FixedLX Appliancecisa_csaf_ot

    Contact Festo Didactic services department at services.didactic@festo.com to update your LX Appliance to the latest version.

02

cvss

Technical severity, 0–10. One row per scoring source.

6.5
010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9
v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 2.7
v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondary · CISA US
v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:Nsecondary · ENISA EU
v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:Nsecondary · report@snyk.ioexploitability 3.9 · impact 2.5
v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:Nsecondary · OSV
v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondary · Festo PSIRT DE
v3.15.6mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79USprimaryCWE-79USCWE-79USCWE-79US
04

affected products (10)

Products and version ranges known to be affected.

05

advisories (3)

Vendor and ecosystem advisories describing this.

  • FSA-202301Festo: Cross-Site-Scripting (XSS) vulnerability in LX-Appliance2023-08-29csaf · festo_psirtDE

    A vulnerability in the Video.js package could allow a user of LX Appliance, with a high privilege account (i.e., with the "Teacher" role), to craft a malicious course and launch an XSS attack.

  • GHSA-pp7m-6j83-m7r6Cross-site Scripting in video.js2021-08-10ghsa · osvUS

    This affects the package video.js before 7.14.3. The src attribute of track tag allows to bypass HTML escaping and execute arbitrary code.

  • ICSA-25-343-02Festo LX Appliance2023-08-29icsa · cisa_csaf_otUS

    A vulnerability in the Video.js package could allow a user of LX Appliance, with a high privilege account (i.e., with the "Teacher" role), to craft a malicious course and launch an XSS attack.

06

also known as (3)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdcisa_csaf_otfesto_psirtnvdosvNVDCVE.orgMITRE
published 2021-07-28modified 2026-06-17
09

references (25)

External citations — patches, advisories, analysis.

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