CVE-2025-3886: An issue in CatoNetworks CatoClient before v.5.8.0 allows attackers to escalate privileges and achieve a race

Q: How do I fix CVE-2025-3886?

cato client: upgrade to 5.8.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-3886 being exploited?

CVE-2025-3886 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-2025-3886 affect?

CVE-2025-3886 affects cato client. Severity is high (CVSS 8.1). An issue in CatoNetworks CatoClient before v.5.8.0 allows attackers to escalate privileges and achieve a race condition (TOCTOU) via the PrivilegedHelperTool component.

Q: How urgent is CVE-2025-3886?

Priority 37/100. High severity; Remotely exploitable, no login, no user action

Routine

HIGH 8.1REMOTEUPGRADE

CVE-2025-3886 is a high-severity flaw (CVSS 8.1) affecting cato client. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue in CatoNetworks CatoClient before v.5.8.0 allows attackers to escalate privileges and achieve a race condition (TOCTOU) via the PrivilegedHelperTool component.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 84%)
CISA exploited list	No
Weakness	CWE-362
Published	2025-04-27
Last modified	2026-06-17

Publisher (CNA): Cato · Vendor: catonetworks

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

Am I affected?

Timeline

2025-04-27 11:15 UTCPublished CVE record published
2026-06-17 09:20 UTCUpdated Record last modified

catonetworks cato client UPGRADE

Affected: < 5.8.0

Fixed in: 5.8.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy cato-client || rpm -q cato-client || cato-client --version

2. UPGRADE to 5.8.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cato-client

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cato-client

Note

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

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-2025-3886?

cato client: upgrade to 5.8.0. Exact commands for each OS are on this page.

Is CVE-2025-3886 being exploited?

CVE-2025-3886 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-2025-3886 affect?

CVE-2025-3886 affects cato client. Severity is high (CVSS 8.1). An issue in CatoNetworks CatoClient before v.5.8.0 allows attackers to escalate privileges and achieve a race condition (TOCTOU) via the PrivilegedHelperTool component.

How urgent is CVE-2025-3886?

Priority 37/100. High severity; Remotely exploitable, no login, no user action

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References

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