CVE-2022-25304

Name: CVE-2022-25304
Creator: NVD / NIST
Published: 2022-08-23T05:15:07.987+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.06%

Last modified Jun 17, 2026

CVE-2022-25304 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. All versions of package opcua; all versions of package asyncua are vulnerable to Denial of Service (DoS) due to a missing limitation on the number of received chunks - per single session or in total for all concurrent sessions. An attacker can exploit this vulnerability by sending an unlimited number of huge chunks (e.g. EPSS estimates a 1.06% chance of exploitation in the next 30 days.

Description

All versions of package opcua; all versions of package asyncua are vulnerable to Denial of Service (DoS) due to a missing limitation on the number of received chunks - per single session or in total for all concurrent sessions. An attacker can exploit this vulnerability by sending an unlimited number of huge chunks (e.g. 2GB each) without sending the Final closing chunk.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.06%

60.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-770

Affected Software

Vendor	Product	Versions
Asyncua Project	Asyncua	All versions
Opcua Project	Opcua	All versions

References

https://github.com/FreeOpcUa/python-opcua/issues/1466Issue Tracking, Third Party Advisory
https://security.snyk.io/vuln/SNYK-PYTHON-ASYNCUA-2988731Third Party Advisory
https://security.snyk.io/vuln/SNYK-PYTHON-OPCUA-2988730Third Party Advisory
https://github.com/FreeOpcUa/python-opcua/issues/1466Issue Tracking, Third Party Advisory
https://security.snyk.io/vuln/SNYK-PYTHON-ASYNCUA-2988731Third Party Advisory
https://security.snyk.io/vuln/SNYK-PYTHON-OPCUA-2988730Third Party Advisory

Timeline

Published: Aug 23, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-25304?

How severe is CVE-2022-25304?

CVE-2022-25304 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.06% probability of exploitation in the next 30 days.

How do I fix CVE-2022-25304?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-25304?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST