CVE-2021-39066
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 · uneditedIBM Financial Transaction Manager 3.2.4 does not invalidate session any existing session identifier gives an attacker the opportunity to steal authenticated sessions. IBM X-Force ID: 215040.
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 confidenceIBM Financial Transaction Manager 3.2.4 suffers from a session fixation vulnerability where existing session identifiers are not invalidated upon successful authentication. An attacker who can set or obtain a session ID before a user authenticates can hijack the authenticated session by leveraging the unchanged session token.
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= 3.2.4CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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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Verify IBM Financial Transaction Manager versionCheck the installed version using IBM installation tools or version files in the installation directory (typically found in product properties or version.info files)Affected if Installed version is exactly 3.2.4
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Examine session management configurationReview the application's session configuration files (such as web.xml or session-config settings in deployment descriptors) to identify how sessions are managed during authenticationAffected if Session configuration does not specify session ID regeneration upon authentication
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Test session ID behavior during loginCapture a session identifier before authentication, perform a successful login, then capture the session identifier again to compare if they differAffected if Session ID remains unchanged after successful authentication (session fixation vulnerability present)
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Review authentication code or configurationInspect the authentication handler or login mechanism configuration for code that regenerates session IDs (such as request.changeSessionId() or similar session fixation protection)Affected if No session ID regeneration logic is found in the authentication flow
A user is affected if they are running IBM Financial Transaction Manager version 3.2.4 and the application does not regenerate session identifiers upon successful authentication.
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 proper session invalidation by regenerating session identifiers upon successful authentication and invalidating old sessions. Additionally, enforce session timeout and consider implementing session binding to additional factors like IP address or user agent.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-39066 — 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-2021-39066 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
- No weaponised exploit code, or anything meant to cause harm
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