CVE-2025-42921: In JetBrains Toolbox App before 2.6 host key verification was missing in SSH plugin

Q: How do I fix CVE-2025-42921?

toolbox: upgrade to 2.6. Exact commands for each OS are on this page.

Q: Is CVE-2025-42921 being exploited?

CVE-2025-42921 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-2025-42921 affect?

CVE-2025-42921 affects toolbox. Severity is medium (CVSS 4.2). In JetBrains Toolbox App before 2.6 host key verification was missing in SSH plugin

Q: How urgent is CVE-2025-42921?

Priority 17/100. No elevated risk signals yet.

Routine

MEDIUM 4.2UPGRADE

CVE-2025-42921 is a medium-severity flaw (CVSS 4.2) affecting toolbox. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In JetBrains Toolbox App before 2.6 host key verification was missing in SSH plugin

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.2 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-297
Published	2025-04-17
Last modified	2026-06-17

Publisher (CNA): JetBrains s.r.o. · Vendor: jetbrains

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

Am I affected?

Timeline

2025-04-17 16:15 UTCPublished CVE record published
2026-06-17 09:23 UTCUpdated Record last modified

jetbrains toolbox UPGRADE

Affected: < 2.6

Fixed in: 2.6

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2.6 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade toolbox

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-2025-42921?

toolbox: upgrade to 2.6. Exact commands for each OS are on this page.

Is CVE-2025-42921 being exploited?

CVE-2025-42921 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-2025-42921 affect?

CVE-2025-42921 affects toolbox. Severity is medium (CVSS 4.2). In JetBrains Toolbox App before 2.6 host key verification was missing in SSH plugin

How urgent is CVE-2025-42921?

Priority 17/100. No elevated risk signals yet.

Related CVEs

CVE-2025-43014 MEDIUM 6.1 UPGRADE In JetBrains Toolbox App before 2.6 the SSH plugin established connections without sufficient user confirmatio
CVE-2025-43013 MEDIUM 6.9 UPGRADE In JetBrains Toolbox App before 2.6 unencrypted credential transmission during SSH authentication was possible
CVE-2025-43012 HIGH 8.3 UPGRADE In JetBrains Toolbox App before 2.6 command injection in SSH plugin was possible
CVE-2024-9177 MEDIUM 6.4 UPGRADE The Themedy Toolbox plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's themedy

References

← Back to latest CVEs