CVE-2022-41777Public exploitNetwork attack vector

Unauthenticated server crash via malformed URL decoding

Published Dec 5, 2022 · Updated Apr 24, 2025

Improper exception handling in kujirahand Nako3edit 3.3.74 and earlier allows remote attackers to crash the editor server via a crafted URL. The file query parameter reaches decodeURIComponent without protection from malformed percent encoding, so a lone percent sign terminates the server. No authentication or user interaction is required, and successful exploitation interrupts the editor service until it is restarted.

CVSS severity7.5
High
EPSS probability1.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper exception handling in kujirahand Nako3edit 3.3.74 and earlier allows remote attackers to crash the editor server via a crafted URL. The file query parameter reaches decodeURIComponent without protection from malformed percent encoding, so a lone percent sign terminates the server. No authentication or user interaction is required, and successful exploitation interrupts the editor service until it is restarted.

The record

CVE
CVE-2022-41777
Published
Dec 5, 2022
Updated
Apr 24, 2025
Vendor
kujirahand
Product
Nako3edit
Classifications
CWE-703, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 5, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 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?

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

  1. Affected versionversion=v3.3.74 and earlier

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

kujirahand · Nako3editversion=v3.3.74 and earlier

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.3JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0JPCERT/CCAV:N/AC:L/Au:N/C:N/I:N/A:P

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-703Improper Check or Handling of Exceptional Conditions
T1499Endpoint Denial of Service

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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