CVE-2021-27756
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 · unedited"TLS-RSA cipher suites are not disabled in BigFix Compliance up to v2.0.5. If TLS 2.0 and secure ciphers are not enabled then an attacker can passively record traffic and later decrypt it."
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 · high confidenceBigFix Compliance up to v2.0.5 does not disable weak TLS-RSA cipher suites, and if TLS 1.2 with secure ciphers is not enforced, an attacker with passive network access can capture encrypted traffic and decrypt it offline using attacks against the weak RSA-based ciphers.
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>= 2.0, < 2.0.6CVSS 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
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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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Check BigFix Compliance installed versionLocate the BigFix Compliance installation and retrieve its version number (typically found in the product UI, registry, or installation directory). Compare it to the affected range: version 2.0.0 through 2.0.5 are vulnerable.Affected if Installed version is 2.0.0 through 2.0.5 (version 2.0.6 and later are patched).
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Verify TLS 1.2 enforcement configurationAccess the BigFix Compliance server configuration and check whether TLS 1.2 is explicitly enforced as the minimum TLS version.Affected if TLS 1.2 is NOT enforced, or older TLS versions (1.0/1.1) are still permitted.
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Inspect enabled cipher suitesReview the BigFix Compliance server configuration for the list of enabled TLS cipher suites. Identify which ciphers are configured for TLS connections.Affected if Weak RSA-based cipher suites (such as TLS_RSA_WITH_* ciphers) are present in the enabled cipher list.
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Confirm RSA cipher exclusionCheck the configuration to determine whether TLS-RSA cipher suites have been explicitly disabled or removed from the allowed cipher list.Affected if TLS-RSA ciphers are NOT explicitly disabled, or strong AES-GCM ciphers are not prioritized.
You are affected if you run BigFix Compliance version 2.0.0-2.0.5 AND TLS 1.2 is not enforced AND weak RSA-based cipher suites remain enabled in your configuration.
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.
dbcve · scoped2.0.6
Enable TLS 1.2 with strong cipher suites (such as AES-GCM) and explicitly disable all TLS-RSA cipher suites in the BigFix Compliance server configuration.
BigFix Compliance 2.0.6
- Download BigFix Compliance version 2.0.6 or later from HCL/BigFix official vendor support site (support.hcltechsw.com)
- Review HCL BigFix Compliance upgrade documentation for version 2.0.6
- Ensure backup of current BigFix Compliance configuration and data
- Apply the upgrade to BigFix Compliance following vendor-provided upgrade procedures
- Verify the upgrade was successful and TLS-RSA cipher suites are disabled in the updated configuration
- Confirm TLS 1.2 or higher with secure cipher suites is enabled
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation2.0 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 $3,072.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-27756 — 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-2021-27756 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