CVE-2021-2221: Vulnerability in the Oracle Secure Global Desktop product of Oracle Virtualization (component: Client)

This month

CRITICAL 9.6DOWNGRADE

CVE-2021-2221 is a critical-severity flaw (CVSS 9.6) affecting secure global desktop. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Vulnerability in the Oracle Secure Global Desktop product of Oracle Virtualization (component: Client). The supported version that is affected is 5.6. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Secure Global Desktop. Successful attacks require human interaction from a person other than the attacker and while the vulnerability is in Oracle Secure Global Desktop,

Why this priority

Critical severity

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

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.0% (top 19%)
CISA exploited list	No
Published	2021-04-22
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

2021-04-22 22:15 UTCPublished CVE record published
2026-06-17 03:49 UTCUpdated Record last modified

oracle secure global desktop DOWNGRADE

Affected: 5.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.6

1. Check installed version

apt-cache policy secure-global-desktop || rpm -q secure-global-desktop || secure-global-desktop --version

2. No fixed release: DOWNGRADE to a release before 5.6 (Debian / Ubuntu)

apt-cache madison secure-global-desktop sudo apt install secure-global-desktop=<VERSION_BEFORE_5.6> sudo apt-mark hold secure-global-desktop

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

dnf --showduplicates list secure-global-desktop sudo dnf downgrade secure-global-desktop-<VERSION_BEFORE_5.6> sudo dnf versionlock add secure-global-desktop

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-2021-2221?

secure global desktop: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-2221 being exploited?

CVE-2021-2221 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-2021-2221 affect?

CVE-2021-2221 affects secure global desktop. Severity is critical (CVSS 9.6). Vulnerability in the Oracle Secure Global Desktop product of Oracle Virtualization (component: Client). The supported version that is affected is 5.6. Easily exploitable vulnerability allows unauthenticated attacker with network access via

How urgent is CVE-2021-2221?

Priority 54/100. Critical severity

Related CVEs

CVE-2021-35650 MEDIUM 4.6 DOWNGRADE Vulnerability in the Oracle Secure Global Desktop product of Oracle Virtualization (component: Client)
CVE-2021-35649 MEDIUM 5.4 DOWNGRADE Vulnerability in the Oracle Secure Global Desktop product of Oracle Virtualization (component: Server)
CVE-2021-2447 CRITICAL 9.9 DOWNGRADE Vulnerability in the Oracle Secure Global Desktop product of Oracle Virtualization (component: Server)
CVE-2021-2446 CRITICAL 9.6 DOWNGRADE Vulnerability in the Oracle Secure Global Desktop product of Oracle Virtualization (component: Client)
CVE-2021-2248 CRITICAL 10.0 DOWNGRADE Vulnerability in the Oracle Secure Global Desktop product of Oracle Virtualization (component: Server)

References

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