CVE-2022-25304: Denial of Service (DoS)

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-08-23 · updated 2026-06-17
Weakness: CWE-770

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.

Affected products

Asyncua Project Asyncua: all versions
opcua: all versions

References

https://github.com/FreeOpcUa/python-opcua/issues/1466
https://security.snyk.io/vuln/SNYK-PYTHON-ASYNCUA-2988731
https://security.snyk.io/vuln/SNYK-PYTHON-OPCUA-2988730
https://github.com/FreeOpcUa/python-opcua/issues/1466
https://security.snyk.io/vuln/SNYK-PYTHON-ASYNCUA-2988731
https://security.snyk.io/vuln/SNYK-PYTHON-OPCUA-2988730

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