CVE-2024-45526Network attack vector

Server slowdown via unbounded rejected-certificate storage

Published Oct 22, 2024 · Updated Oct 23, 2024

Resource exhaustion in OPC Foundation OPC UA .NET Standard before 1.5.374.118 allows remote attackers to degrade server performance. The authentication-failure path saves rejected certificates to persistent storage without bounding accumulated entries. Unauthenticated network access to an OPC UA endpoint is sufficient; repeated invalid-credential requests grow the store and progressively slow the server.

CVSS severity5.3
Medium
EPSS probability0.50%
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 OPC Foundation OPC UA .NET Standard before 1.5.374.118 allows remote attackers to degrade server performance. The authentication-failure path saves rejected certificates to persistent storage without bounding accumulated entries. Unauthenticated network access to an OPC UA endpoint is sufficient; repeated invalid-credential requests grow the store and progressively slow the server.

The record

CVE
CVE-2024-45526
Published
Oct 22, 2024
Updated
Oct 23, 2024
Vendor
OPC Foundation
Product
OPC UA .NET Standard
Classifications
CWE-770, T1499.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 22, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 23, 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 <=1.5.374.78

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OPC Foundation · OPC UA .NET Standardversion=0 <=1.5.374.78

Published CVSS scores

5.3OPC FoundationCVSS:3.1/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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.002Service Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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