CVE-2021-27188: The Sovremennye Delovye Tekhnologii FX Aggregator terminal client 1 allows attackers to cause a denial of serv

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HIGH 7.5REMOTEDOWNGRADE

CVE-2021-27188 is a high-severity flaw (CVSS 7.5) affecting fx aggregator terminal client. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Sovremennye Delovye Tekhnologii FX Aggregator terminal client 1 allows attackers to cause a denial of service (access suspended for five hours) by making five invalid login attempts to a victim's account.

Why this priority

High severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.8% (top 21%)
CISA exploited list	No
Weakness	CWE-307
Published	2021-02-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: xn--b1agzlht

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

Am I affected?

Timeline

2021-02-12 08:15 UTCPublished CVE record published
2026-06-17 03:44 UTCUpdated Record last modified

xn--b1agzlht fx aggregator terminal client DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy fx-aggregator-terminal-client || rpm -q fx-aggregator-terminal-client || fx-aggregator-terminal-client --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison fx-aggregator-terminal-client sudo apt install fx-aggregator-terminal-client=<VERSION_BEFORE_1.0> sudo apt-mark hold fx-aggregator-terminal-client

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

dnf --showduplicates list fx-aggregator-terminal-client sudo dnf downgrade fx-aggregator-terminal-client-<VERSION_BEFORE_1.0> sudo dnf versionlock add fx-aggregator-terminal-client

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-2021-27188?

fx aggregator terminal client: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-27188 being exploited?

CVE-2021-27188 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-2021-27188 affect?

CVE-2021-27188 affects fx aggregator terminal client. Severity is high (CVSS 7.5). The Sovremennye Delovye Tekhnologii FX Aggregator terminal client 1 allows attackers to cause a denial of service (access suspended for five hours) by making five invalid login attempts to a victim's account.

How urgent is CVE-2021-27188?

Priority 51/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-27187 HIGH 7.5 DOWNGRADE The Sovremennye Delovye Tekhnologii FX Aggregator terminal client 1 stores authentication credentials in clear

References

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