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Junos Os EvolvedOperating system · Juniper

CVE-2022-22195

HIGH · 7.5 CVSS v3.1 Developing Published 2022-04-14
Fix available
A fix is available. Upgrade to 20.4 or later.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
An Improper Update of Reference Count vulnerability in the kernel of Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to trigger a counter overflow, eventually causing a Denial of Service (DoS). This issue affects Juniper Networks Junos OS Evolved: All versions prior to 20.4R3-S1-EVO; 21.1 versions prior to 21.1R3-EVO; 21.2 versions prior to 21.2R3-EVO; 21.3 versions prior to 21.3R2-EVO. This issue does not affect Juniper Networks Junos OS.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · low confidence
Developing — this CVE was published recently and its authoritative NVD entry is still being established, so we're holding a technical summary until the source data settles rather than publish something unreliable. Re-checking after 2026-08-01.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Junos Os EvolvedOperating system
Affected:< 20.4= 20.4= 21.1= 21.2= 21.3

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 20.4 or later
Fixed in 20.4
Recommended fix High confidence

20.4R3-S1-EVO (or 21.1R3-EVO, 21.2R3-EVO, or 21.3R2-EVO depending on your release branch)

  1. 1. Identify the current Junos OS Evolved version using 'show version' command
  2. 2. Compare the current version against the fixed releases: 20.4R3-S1-EVO, 21.1R3-EVO, 21.2R3-EVO, or 21.3R2-EVO
  3. 3. If running an affected version (< 20.4R3-S1-EVO, 21.1 versions prior to 21.1R3-EVO, 21.2 versions prior to 21.2R3-EVO, or 21.3 versions prior to 21.3R2-EVO), plan for an upgrade
  4. 4. Download the appropriate fixed Junos OS Evolved image from Juniper Networks
  5. 5. Schedule a maintenance window as upgrades require system downtime
  6. 6. Follow standard Junos OS Evolved upgrade procedure using 'request system software add' command
  7. 7. Verify the upgrade completed successfully and the new version is running
  8. 8. Confirm the fix is applied by checking 'show version' and verifying the version is at or above the fixed release for your branch
Caveat Network OS upgrades require careful planning and testing in a non-production environment first; verify compatibility with existing configurations and hardware

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,950. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2022-22195 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
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  • Version or environment caveats, and links to real fixes
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