CVE-2021-29500
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 · uneditedbubble fireworks is an open source java package relating to Spring Framework. In bubble fireworks before version 2021.BUILD-SNAPSHOT there is a vulnerability in which the package did not properly verify the signature of JSON Web Tokens. This allows to forgery of valid JWTs.
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 bubble fireworks Java package before version 2021.BUILD-SNAPSHOT contains a critical JWT signature validation bypass. The application fails to properly verify the cryptographic signature of JSON Web Tokens, allowing attackers to forge valid authentication tokens and impersonate 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< 2021.build-snapshotCVSS 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
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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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Identify the installed bubble fireworks package versionCheck your project dependency file (pom.xml, build.gradle, or equivalent) for the bubble fireworks package version, or run a package manager command to list the installed versionAffected if The installed version is any version before 2021.build-snapshot (e.g., older snapshot versions, release versions prior to 2021)
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Confirm JWT authentication is in useSearch your application codebase for JWT token creation, parsing, or validation libraries (such as jjwt, nimbus-jose-jwt, or similar). Look for imports and usage of JWT-related classesAffected if The application processes or validates JSON Web Tokens for authentication or authorization purposes
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Inspect JWT signature verification implementationLocate the code that validates JWT signatures. Common patterns include using a JwtParser, JWTVerifier, or similar validation class. Check the verify() or parse() methods for signature validation logicAffected if The code processes JWTs but does not call signature verification methods, or verification is conditionally skipped
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Check for weak or disabled cryptographic algorithmsReview the JWT library configuration for the algorithm setting (such as 'setSigningKey', 'setAlgorithm', or similar). Identify which algorithm is used for signature verification (e.g., HS256, RS256, none)Affected if The algorithm is set to 'none' or uses an insecure/weak algorithm without proper validation
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Verify key validation is performedExamine the key retrieval logic before signature verification. Check that the signing key is validated against expected values and not derived from untrusted inputAffected if The signing key is not validated, or the validation logic accepts arbitrary keys from user input or untrusted sources
A user is affected if they use bubble fireworks version before 2021.build-snapshot and their application performs JWT authentication without proper cryptographic signature verification and key validation.
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 data2021.build-snapshot
Upgrade to version 2021.BUILD-SNAPSHOT or later and ensure JWT signature verification is properly implemented using strong cryptographic algorithms with correct key validation.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-29500 — 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-2021-29500 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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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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