CVE-2021-45466Known exploitationPublic exploitNetwork attack vector

Remote file write via add_server API

Published Dec 26, 2022 · Updated Apr 14, 2025

Arbitrary file write in Control Web Panel before 0.9.8.1107 allows remote attackers to write authorized_keys through the add_server API. The handler appends attacker-controlled data to a TXT file in /resources without enforcing the required API authorization. The file-write request requires API access; the documented pre-authentication code-execution chain obtains a key and includes the file through a separate flaw.

CVSS severity9.8
Critical
EPSS probability55.34%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file write in Control Web Panel before 0.9.8.1107 allows remote attackers to write authorized_keys through the add_server API. The handler appends attacker-controlled data to a TXT file in /resources without enforcing the required API authorization. The file-write request requires API access; the documented pre-authentication code-execution chain obtains a key and includes the file through a separate flaw.

The record

CVE
CVE-2021-45466
Published
Dec 26, 2022
Updated
Apr 14, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-863, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 26, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/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.

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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 exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1190Exploit Public-Facing Application

Public exploit references

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

Reported exploitation

Technologies

Your stack

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Your stack

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