How severe is CVE-2019-19135?

CVE-2019-19135 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2019-19135 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-19135?

CVE-2019-19135 primarily affects Opcfoundation Netstandard.opc.ua. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-19135?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-19135 published?

CVE-2019-19135 was published on 2020-03-16 and last updated on 2026-06-17.

CVE-2019-19135

CVE-2019-19135 is a high-severity vulnerability in Opcfoundation Netstandard.opc.ua with a CVSS 3.x base score of 7.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-330.

Key facts

Severity: High (CVSS 3.x base score 7.4)
CVSS v2: 5.8
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-330
Affected product: Opcfoundation Netstandard.opc.ua
Published: 2020-03-16
Last modified: 2026-06-17

Description

In OPC Foundation OPC UA .NET Standard codebase 1.4.357.28, servers do not create sufficiently random numbers in OPCFoundation.NetStandard.Opc.Ua before 1.4.359.31, which allows man in the middle attackers to reuse encrypted user credentials sent over the network.

Frequently asked questions

What is CVE-2019-19135?: In OPC Foundation OPC UA .NET Standard codebase 1.4.357.28, servers do not create sufficiently random numbers in OPCFoundation.NetStandard.Opc.Ua before 1.4.359.31, which allows man in the middle attackers to reuse encrypted user credentials sent over the network.
How severe is CVE-2019-19135?: CVE-2019-19135 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2019-19135 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-19135?: CVE-2019-19135 primarily affects Opcfoundation Netstandard.opc.ua. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-19135?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-19135 published?: CVE-2019-19135 was published on 2020-03-16 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:opcfoundation:netstandard.opc.ua:*:*:*:*:*:*:*:*
cpe:2.3:a:opcfoundation:ua-.netstandard:1.4.357.28:*:*:*:*:*:*:*

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