CVE-2022-25921Public exploitNetwork attack vector

Arbitrary code execution via unsanitized format strings

Published Aug 29, 2022 · Updated Sep 17, 2024

Code injection in IndexZero morgan-json 1.1.0 and earlier allows remote attackers to execute arbitrary code via a crafted format string. The compile and compileObject paths splice format-derived text into generated JavaScript and pass the result to the Function constructor without neutralizing executable syntax. Exploitation requires a consuming Node.js application to let attackers influence the logging format, and injected code runs with that application process's privileges.

CVSS severity8.1
High
EPSS probability1.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Code injection in IndexZero morgan-json 1.1.0 and earlier allows remote attackers to execute arbitrary code via a crafted format string. The compile and compileObject paths splice format-derived text into generated JavaScript and pass the result to the Function constructor without neutralizing executable syntax. Exploitation requires a consuming Node.js application to let attackers influence the logging format, and injected code runs with that application process's privileges.

The record

CVE
CVE-2022-25921
Published
Aug 29, 2022
Updated
Sep 17, 2024
Vendor
IndexZero
Product
morgan-json
Classifications
CWE-94, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 29, 2022CVE 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <unspecified

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IndexZero · morgan-jsonversion=0 <unspecified

Published CVSS scores

8.1SnykCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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 exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo