CVE-2020-28464Public exploitNetwork attack vector

Arbitrary JavaScript execution via unsanitized schema values

Published Jan 4, 2021 · Updated Sep 17, 2024

Code injection in Korzio Djv before 2.1.4 allows attackers to execute arbitrary JavaScript through a crafted schema file. The validator's template helper interpolates schema-derived arguments into generated function source without neutralizing JavaScript metacharacters. Exploitation requires control of a schema supplied to addSchema and processed by validate, after which the injected expression runs with the consuming Node.js process's privileges.

CVSS severity9.8
Critical
EPSS probability3.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Korzio Djv before 2.1.4 allows attackers to execute arbitrary JavaScript through a crafted schema file. The validator's template helper interpolates schema-derived arguments into generated function source without neutralizing JavaScript metacharacters. Exploitation requires control of a schema supplied to addSchema and processed by validate, after which the injected expression runs with the consuming Node.js process's privileges.

The record

CVE
CVE-2020-28464
Published
Jan 4, 2021
Updated
Sep 17, 2024
Vendor
Korzio
Product
Djv
Classifications
CWE-94, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 4, 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 <2.1.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Korzio · Djvversion=unspecified <2.1.4

Published CVSS scores

9.8SnykCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0NIST NVDAV:N/AC:L/Au:N/C:C/I:C/A:C

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 exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.007JavaScript/JScript

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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