CVE-2022-40224Public exploitNetwork attack vector

Web management interruption via malformed HTTP framing

Published Feb 7, 2023 · Updated Mar 5, 2025

Denial of service in the Moxa SDS-3008 Series web server in firmware 2.1 and earlier allows remote attackers to interrupt web management. The HTTPS parser terminates its web-server thread when a request to port 443 omits one of the two CRLF line endings required between the header and body. No authentication or user interaction is required; ports 80 and 443 stop accepting connections until the device restarts the web server after several minutes.

CVSS severity7.5
High
EPSS probability64.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Moxa SDS-3008 Series web server in firmware 2.1 and earlier allows remote attackers to interrupt web management. The HTTPS parser terminates its web-server thread when a request to port 443 omits one of the two CRLF line endings required between the header and body. No authentication or user interaction is required; ports 80 and 443 stop accepting connections until the device restarts the web server after several minutes.

The record

CVE
CVE-2022-40224
Published
Feb 7, 2023
Updated
Mar 5, 2025
Vendor
Moxa
Product
SDS-3008 Series
Classifications
CWE-410, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 7, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 5, 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=2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Moxa · SDS-3008 Seriesversion=2.1

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.3Cisco TalosCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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 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-410Insufficient Resource Pool
T1499.004Application or System Exploitation

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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