CVE-2021-27523: An issue was discovered in open-falcon dashboard version 0.2.0, allows remote attackers to gain, modify, and d

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-27523 is a critical-severity flaw (CVSS 9.8) affecting dashboard. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in open-falcon dashboard version 0.2.0, allows remote attackers to gain, modify, and delete sensitive information via crafted POST request to register interface.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 33%)
CISA exploited list	No
Published	2023-08-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: open-falcon

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

Am I affected?

Timeline

2023-08-11 14:15 UTCPublished CVE record published
2026-06-17 03:45 UTCUpdated Record last modified

open-falcon dashboard DOWNGRADE

Affected: 0.2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.2.0

1. Check installed version

apt-cache policy dashboard || rpm -q dashboard || dashboard --version

2. No fixed release: DOWNGRADE to a release before 0.2.0 (Debian / Ubuntu)

apt-cache madison dashboard sudo apt install dashboard=<VERSION_BEFORE_0.2.0> sudo apt-mark hold dashboard

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

dnf --showduplicates list dashboard sudo dnf downgrade dashboard-<VERSION_BEFORE_0.2.0> sudo dnf versionlock add dashboard

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-2021-27523?

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

Is CVE-2021-27523 being exploited?

CVE-2021-27523 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-2021-27523 affect?

CVE-2021-27523 affects dashboard. Severity is critical (CVSS 9.8). An issue was discovered in open-falcon dashboard version 0.2.0, allows remote attackers to gain, modify, and delete sensitive information via crafted POST request to register interface.

How urgent is CVE-2021-27523?

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

References

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