CVE-2022-25903: The package opcua from 0.0.0 are vulnerable to Denial of Service (DoS) via the ExtensionObjects and Variants o

This month

HIGH 7.5REMOTEDOWNGRADE

CVE-2022-25903 is a high-severity flaw (CVSS 7.5) affecting opcua. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The package opcua from 0.0.0 are vulnerable to Denial of Service (DoS) via the ExtensionObjects and Variants objects, when it allows unlimited nesting levels, which could result in a stack overflow even if the message size is less than the maximum allowed.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 27%)
CISA exploited list	No
Weakness	CWE-787
Published	2022-08-24
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: opcua project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-08-24 05:15 UTCPublished CVE record published
2026-06-17 04:34 UTCUpdated Record last modified

opcua project opcua DOWNGRADE

Affected: >= 0.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.0.0

1. Check installed version

apt-cache policy opcua || rpm -q opcua || opcua --version

2. No fixed release: DOWNGRADE to a release before 0.0.0 (Debian / Ubuntu)

apt-cache madison opcua sudo apt install opcua=<VERSION_BEFORE_0.0.0> sudo apt-mark hold opcua

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list opcua sudo dnf downgrade opcua-<VERSION_BEFORE_0.0.0> sudo dnf versionlock add opcua

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2022-25903?

opcua: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-25903 being exploited?

CVE-2022-25903 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2022-25903 affect?

CVE-2022-25903 affects opcua. Severity is high (CVSS 7.5). The package opcua from 0.0.0 are vulnerable to Denial of Service (DoS) via the ExtensionObjects and Variants objects, when it allows unlimited nesting levels, which could result in a stack overflow even if the message size is less than the

How urgent is CVE-2022-25903?

Priority 49/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-25888 HIGH 7.5 DOWNGRADE The package opcua from 0.0.0 are vulnerable to Denial of Service (DoS) due to a missing limitation on the numb
CVE-2022-25304 HIGH 7.5 MITIGATE MITIGATE All versions of package opcua; all versions of package asyncua are vulnerable to Denial of Service (DoS) due t

References

← Back to latest CVEs