CVE-2021-27188
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedThe 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceThe FX Aggregator terminal client has a logic flaw in its account lockout mechanism. An attacker can cause denial of service by making five invalid login attempts to any victim's account, which triggers an automatic five-hour access suspension. This can be exploited repeatedly to permanently lock out legitimate users.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 1.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify the installed FX Aggregator Terminal Client versionCheck the application version in the client (typically via Help > About or the installer metadata). The affected version is 1.0.Affected if The installed version is exactly 1.0 or falls within the 1.0 branch.
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Locate the account lockout configuration fileSearch for configuration files in the client installation directory related to authentication, security, or account policies (commonly named auth.config, security.xml, or similar).Affected if A lockout configuration exists with a fixed-duration setting of 5 hours after 5 failed attempts.
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Review the login attempt counter mechanismInspect the authentication module code or configuration to verify how failed login attempts are tracked and processed.Affected if The system uses a simple counter that triggers a fixed-duration suspension without progressive penalties or reset conditions.
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Check for rate limiting or CAPTCHA on failed loginsExamine the login interface and authentication workflow for any rate-limiting controls or CAPTCHA challenges after failed attempts.Affected if No rate limiting, CAPTCHA, or progressive lockout delays are implemented.
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Examine authentication logs for lockout patternsReview application or system logs for entries indicating account suspensions following multiple failed logins.Affected if Logs show five failed attempts consistently triggering five-hour suspensions that can be repeatedly triggered.
A defender is affected if they run FX Aggregator Terminal Client version 1.0 with a fixed five-attempt/five-hour lockout policy and no rate limiting or progressive penalties in place.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataImplement progressive account lockout with rate limiting rather than fixed-duration suspensions; add CAPTCHA or multi-factor authentication for failed attempts; implement account recovery mechanisms that allow legitimate users to regain access without waiting.
- Consultation2.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,480.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-27188 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-27188 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data