CVE-2022-25761: The package open62541/open62541 before 1.2.5, from 1.3-rc1 and before 1.3.1 are vulnerable to Denial of Servic

Q: How do I fix CVE-2022-25761?

open62541: upgrade to 1.2.5; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2022-25761 being exploited?

CVE-2022-25761 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2022-25761 affect?

CVE-2022-25761 affects open62541, fedora. Severity is high (CVSS 7.5). The package open62541/open62541 before 1.2.5, from 1.3-rc1 and before 1.3.1 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.

Q: How urgent is CVE-2022-25761?

Priority 50/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADEMITIGATE

CVE-2022-25761 is a high-severity flaw (CVSS 7.5) affecting open62541, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The package open62541/open62541 before 1.2.5, from 1.3-rc1 and before 1.3.1 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 this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

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-770
Published	2022-08-23
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: fedoraproject · open62541

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

Am I affected?

Timeline

2022-08-23 05:15 UTCPublished CVE record published
2026-06-17 04:34 UTCUpdated Record last modified

open62541 open62541 UPGRADE

Affected: < 1.2.5 · 1.3 rc1 · 1.3 rc2 · 1.3 rc2-ef · 1.3 rc2-ef2

Fixed in: 1.2.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy open62541 || rpm -q open62541 || open62541 --version

2. UPGRADE to 1.2.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade open62541

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade open62541

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

fedoraproject fedora MITIGATE

Affected: 37

Fixed in: no fixed release known

Safe to downgrade to: a release before 37

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2022-25761?

open62541: upgrade to 1.2.5; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-25761 being exploited?

CVE-2022-25761 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-2022-25761 affect?

CVE-2022-25761 affects open62541, fedora. Severity is high (CVSS 7.5). The package open62541/open62541 before 1.2.5, from 1.3-rc1 and before 1.3.1 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.

How urgent is CVE-2022-25761?

Priority 50/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-36429 MEDIUM 5.5 UPGRADE Variant_encodeJson in open62541 1.x before 1.0.4 has an out-of-bounds write for a large recursion depth.

References

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