CVE-2022-24298Public exploitNetwork attack vector

Service interruption via unrestricted CloseSession memory consumption

Published Aug 23, 2022 · Updated Sep 17, 2024

Resource exhaustion in FreeOpcUa all versions allows remote attackers to interrupt OPC UA service availability through crafted requests. The CloseSession handler permits requests with deleteSubscription set to False to bypass memory-consumption limits, so repetition consumes unchecked resources. Any unauthenticated client with network access to the OPC UA endpoint can exhaust memory until the service becomes unavailable.

CVSS severity7.5
High
EPSS probability0.92%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in FreeOpcUa all versions allows remote attackers to interrupt OPC UA service availability through crafted requests. The CloseSession handler permits requests with deleteSubscription set to False to bypass memory-consumption limits, so repetition consumes unchecked resources. Any unauthenticated client with network access to the OPC UA endpoint can exhaust memory until the service becomes unavailable.

The record

CVE
CVE-2022-24298
Published
Aug 23, 2022
Updated
Sep 17, 2024
Vendor
FreeOpcUa
Product
FreeOpcUa
Classifications
CWE-770, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 23, 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

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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=0 <unspecified

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FreeOpcUa · FreeOpcUaversion=0 <unspecified

Published CVSS scores

7.5SnykCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.003Application Exhaustion Flood

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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