CVE-2025-55271
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 · uneditedHCL Aftermarket DPC is affected by HTTP Response Splitting vulnerability where in depending on how the web application handles the split response, an attacker may be able to execute arbitrary commands or inject harmful content into the response..
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 confidenceHCL Aftermarket DPC is vulnerable to HTTP Response Splitting, a web application flaw where unsanitized user input containing CRLF characters (\r\n) gets injected into HTTP response headers. This allows attackers to inject additional headers or response body content, potentially leading to command injection or malicious content injection into responses served to other 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= 1.0.0CVSS 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
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 the installed version of Hcltech Aftermarket CloudCheck your product installation or deployment manifest for the exact version number of Hcltech Aftermarket Cloud. Compare it to the affected version: 1.0.0Affected if Your installed version is exactly 1.0.0
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Identify HTTP header construction points in your applicationSearch your application codebase for any code that builds or modifies HTTP response headers, particularly those that incorporate user-supplied input such as query parameters, form fields, cookies, or URL pathsAffected if User-supplied data is directly used in HTTP response headers without validation
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Inspect input validation for header-related parametersReview any input validation or sanitization logic that processes values before they are placed into HTTP headers. Look for checks that reject or strip CR (\r) and LF (\n) charactersAffected if No validation exists to reject CR/LF characters before they are used in headers, or such validation can be bypassed
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Audit custom header-setting implementationsExamine any custom code or configuration that manually constructs HTTP headers rather than using framework-provided methods. Check if these implementations perform encoding or validation on header valuesAffected if Custom header construction is used and does not sanitize CR/LF characters
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Review proxy or gateway configurations if applicableIf a reverse proxy, load balancer, or API gateway sits in front of the Aftermarket Cloud application, verify whether it performs header validation that could detect or block response splitting attemptsAffected if No intermediate validation exists between user input and HTTP response header generation
You are affected if you are running Hcltech Aftermarket Cloud version 1.0.0 and your deployment incorporates user-supplied input into HTTP response headers without rejecting CR/LF characters.
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 strict input validation to reject or sanitize any CRLF characters (\r\n) from user-supplied data before including it in HTTP response headers, and use framework-provided methods for header construction that automatically escape such characters.
- Consultation2.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-55271 — 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-2025-55271 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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