CVE-2025-21547: Vulnerability in the Oracle Hospitality OPERA 5 product of Oracle Hospitality Applications (component: Opera S

This month

CRITICAL 9.1REMOTEDOWNGRADE

CVE-2025-21547 is a critical-severity flaw (CVSS 9.1) affecting hospitality opera 5. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Vulnerability in the Oracle Hospitality OPERA 5 product of Oracle Hospitality Applications (component: Opera Servlet). Supported versions that are affected are 5.6.19.20, 5.6.25.8, 5.6.26.6 and 5.6.27.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle Hospitality OPERA 5. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete ac

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-400
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 hospitality opera 5 DOWNGRADE

Affected: 5.6.19.20 · 5.6.25.8 · 5.6.26.6 · 5.6.27.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.6.19.20

1. Check installed version

apt-cache policy hospitality-opera-5 || rpm -q hospitality-opera-5 || hospitality-opera-5 --version

2. No fixed release: DOWNGRADE to a release before 5.6.19.20 (Debian / Ubuntu)

apt-cache madison hospitality-opera-5 sudo apt install hospitality-opera-5=<VERSION_BEFORE_5.6.19.20> sudo apt-mark hold hospitality-opera-5

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list hospitality-opera-5 sudo dnf downgrade hospitality-opera-5-<VERSION_BEFORE_5.6.19.20> sudo dnf versionlock add hospitality-opera-5

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-2025-21547?

hospitality opera 5: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-21547 being exploited?

CVE-2025-21547 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-2025-21547 affect?

CVE-2025-21547 affects hospitality opera 5. Severity is critical (CVSS 9.1). Vulnerability in the Oracle Hospitality OPERA 5 product of Oracle Hospitality Applications (component: Opera Servlet). Supported versions that are affected are 5.6.19.20, 5.6.25.8, 5.6.26.6 and 5.6.27.1. Easily exploitable vulnerability a

How urgent is CVE-2025-21547?

Priority 49/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-21172 CRITICAL 9.0 DOWNGRADE Vulnerability in the Oracle Hospitality OPERA 5 product of Oracle Hospitality Applications (component: Opera S

References

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