CVE-2021-47771: RDP Manager 4.9.9.3 contains a denial of service vulnerability in connection input fields that allows local at

Routine

MEDIUM 5.5DOWNGRADE

CVE-2021-47771 is a medium-severity flaw (CVSS 5.5) affecting rdp manager. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

RDP Manager 4.9.9.3 contains a denial of service vulnerability in connection input fields that allows local attackers to crash the application. Attackers can add oversized entries in Verbindungsname and Server fields to permanently freeze and crash the software, potentially requiring full reinstallation.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 84%)
CISA exploited list	No
Weakness	CWE-770
Published	2026-01-15
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: cinspiration

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

Am I affected?

Timeline

2026-01-15 16:16 UTCPublished CVE record published
2026-06-17 04:18 UTCUpdated Record last modified

cinspiration rdp manager DOWNGRADE

Affected: 4.9.9.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.9.9.3

1. Check installed version

apt-cache policy rdp-manager || rpm -q rdp-manager || rdp-manager --version

2. No fixed release: DOWNGRADE to a release before 4.9.9.3 (Debian / Ubuntu)

apt-cache madison rdp-manager sudo apt install rdp-manager=<VERSION_BEFORE_4.9.9.3> sudo apt-mark hold rdp-manager

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

dnf --showduplicates list rdp-manager sudo dnf downgrade rdp-manager-<VERSION_BEFORE_4.9.9.3> sudo dnf versionlock add rdp-manager

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-2021-47771?

rdp manager: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-47771 being exploited?

CVE-2021-47771 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-2021-47771 affect?

CVE-2021-47771 affects rdp manager. Severity is medium (CVSS 5.5). RDP Manager 4.9.9.3 contains a denial of service vulnerability in connection input fields that allows local attackers to crash the application. Attackers can add oversized entries in Verbindungsname and Server fields to permanently freeze a

How urgent is CVE-2021-47771?

Priority 28/100. Public exploit reference

Software pages

WinRM and RDP vulnerabilities

References

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