CVE-2025-21495: Vulnerability in the MySQL Enterprise Firewall product of Oracle MySQL (component: Firewall)

Routine

MEDIUM 4.4WATCHLISTUPGRADE

CVE-2025-21495 is a medium-severity flaw (CVSS 4.4) affecting mysql enterprise firewall. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Vulnerability in the MySQL Enterprise Firewall product of Oracle MySQL (component: Firewall). Supported versions that are affected are 8.0.40 and prior, 8.4.3 and prior and 9.1.0 and prior. Difficult to exploit vulnerability allows high privileged attacker with network access via multiple protocols to compromise MySQL Enterprise Firewall. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	4.4 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	High
User interaction	None
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-770
Published	2025-01-21
Last modified	2026-06-17

Publisher (CNA): Oracle · Vendor: oracle

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

Am I affected?

Timeline

2025-01-21 21:15 UTCPublished CVE record published
2026-06-17 08:43 UTCUpdated Record last modified

oracle mysql enterprise firewall UPGRADE

Affected: >= 8.0.0 and <= 8.0.40 · >= 8.4.0 and <= 8.4.3 · 9.1.0

Fixed in: newer than 8.4.3

Safe to downgrade to: a release before 8.0.0

1. Check installed version

apt-cache policy mysql-enterprise-firewall || rpm -q mysql-enterprise-firewall || mysql-enterprise-firewall --version

2. UPGRADE to newer than 8.4.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mysql-enterprise-firewall

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mysql-enterprise-firewall

Note

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

3. If no update is available yet, DOWNGRADE to a release before 8.0.0 (Debian / Ubuntu)

apt-cache madison mysql-enterprise-firewall sudo apt install mysql-enterprise-firewall=<VERSION_BEFORE_8.0.0> sudo apt-mark hold mysql-enterprise-firewall

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mysql-enterprise-firewall sudo dnf downgrade mysql-enterprise-firewall-<VERSION_BEFORE_8.0.0> sudo dnf versionlock add mysql-enterprise-firewall

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-2025-21495?

mysql enterprise firewall: upgrade to newer than 8.4.3. Exact commands for each OS are on this page.

Is CVE-2025-21495 being exploited?

CVE-2025-21495 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-2025-21495 affect?

CVE-2025-21495 affects mysql enterprise firewall. Severity is medium (CVSS 4.4). Vulnerability in the MySQL Enterprise Firewall product of Oracle MySQL (component: Firewall). Supported versions that are affected are 8.0.40 and prior, 8.4.3 and prior and 9.1.0 and prior. Difficult to exploit vulnerability allows high p

How urgent is CVE-2025-21495?

Priority 32/100. On your watchlist

Software pages

MySQL vulnerabilities

References

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