Denial of service (DoS) in opcua
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-770.
Summary
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | opcua | all versions | — | No fix listed | CNA |
| — | asyncua | all versions | — | No fix listed | CNA |
| — | asyncua (PyPI) | before 0.9.96 | 0.9.96 | Patch available | GHSA-mfpj-3qhm-976m |
| — | opcua (PyPI) | up to 0.98.13 | — | No fix listed | GHSA-mfpj-3qhm-976m |
- opcua Vendor— Affected all versions Fixed in — No fix listed CNA
- asyncua Vendor— Affected all versions Fixed in — No fix listed CNA
- asyncua (PyPI) Vendor— Affected before 0.9.96 Fixed in 0.9.96 Patch available GHSA-mfpj-3qhm-976m
- opcua (PyPI) Vendor— Affected up to 0.98.13 Fixed in — No fix listed GHSA-mfpj-3qhm-976m
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:asyncua_project:asyncua:*:*:*:*:*:python:*:* | all versions | Vulnerable | Asyncua Project |
| cpe:2.3:a:opcua_project:opcua:*:*:*:*:*:python:*:* | all versions | Vulnerable | Opcua Project |
- cpe:2.3:a:asyncua_project:asyncua:*:*:*:*:*:python:*:* Versions all versions Vulnerable ·Asyncua Project
- cpe:2.3:a:opcua_project:opcua:*:*:*:*:*:python:*:* Versions all versions Vulnerable ·Opcua Project
Remediation
- Fix · GHSA-mfpj-3qhm-976m asyncua (PyPI) Fixed in 0.9.96 Advisory →
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
opcua unspecified
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2022-09445 Denial of service (DoS) in opcuaPriority LOW 36
Timeline
- 2026-10-02 Threatist record created from CVE-2022-25304
- 2026-10-03 Alias added: GHSA-mfpj-3qhm-976m
References
Sources
- CVE-2022-25304 · CVE Program
- CVE-2022-25304 · NVD
- FIRST EPSS
- GHSA-mfpj-3qhm-976m · GitHub Advisory Database · CC BY 4.0
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