CVE-2021-2177: Vulnerability in the Oracle Secure Global Desktop product of Oracle Virtualization (component: Gateway)

This week

CRITICAL 10.0REMOTEDOWNGRADE

CVE-2021-2177 is a critical-severity flaw (CVSS 10.0) 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: Gateway). 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. While the vulnerability is in Oracle Secure Global Desktop, attacks may significantly impact additional products. Successful attacks of this vulne

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	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.5% (top 15%)
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 03:48 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-2021-2177?

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

Is CVE-2021-2177 being exploited?

CVE-2021-2177 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-2021-2177 affect?

CVE-2021-2177 affects secure global desktop. Severity is critical (CVSS 10.0). Vulnerability in the Oracle Secure Global Desktop product of Oracle Virtualization (component: Gateway). The supported version that is affected is 5.6. Easily exploitable vulnerability allows unauthenticated attacker with network access via

How urgent is CVE-2021-2177?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

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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