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Traffic ServerApplication · Apache

CVE-2024-53868

HIGH · 7.5 CVSS v3.1 Published 2025-04-03
Fix available
A fix is available. Upgrade to 9.2.10 / 10.0.5 or later.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

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
Apache Traffic Server allows request smuggling if chunked messages are malformed.  This issue affects Apache Traffic Server: from 9.2.0 through 9.2.9, from 10.0.0 through 10.0.4. Users are recommended to upgrade to version 9.2.10 or 10.0.5, which fixes the issue.

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 confidence

Apache Traffic Server contains a request smuggling vulnerability triggered by malformed chunked transfer encoding messages. When processing chunked HTTP requests, improper validation allows attackers to manipulate the boundaries between requests, potentially bypassing security controls and accessing unauthorized resources through the proxy.

MitigationUpgrade Apache Traffic Server to version 9.2.10 or 10.0.5 to address the vulnerability. If immediate upgrading is not possible, implement strict input validation at upstream proxies and monitor for anomalous request patterns.

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
Traffic ServerApplication
Affected:>= 9.0.0, < 9.2.10>= 10.0.0, < 10.0.5

CVSS 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 checks

Work through these to decide whether this CVE applies to you.

  1. Determine Apache Traffic Server version
    Run 'traffic_server -V' or check the version via package manager (e.g., 'rpm -q traffic-server' or 'dpkg -l trafficserver'). Alternatively, inspect the output of 'traffic_manager --version' or check /usr/local/etc/trafficserver for version information.
    Affected if The installed version falls within 9.0.0 to 9.2.9 (for the 9.x branch) or 10.0.0 to 10.0.4 (for the 10.x branch).
  2. Verify proxy mode is enabled
    Check the records.config file (typically in /etc/trafficserver/ or /usr/local/etc/trafficserver/) for proxy.config.http.enabled or inspect the remap.config file to confirm URL remapping rules exist, indicating the server is functioning as a proxy.
    Affected if The server is configured as an HTTP proxy (reverse or forward) and handles client requests.
  3. Confirm chunked transfer encoding is in use
    Review proxy.config.http.chunked_* settings in records.config. Check access logs or capture live traffic to identify requests using 'Transfer-Encoding: chunked' header. Use 'traffic_logstat' or inspect /var/log/trafficserver/access.log for chunked requests.
    Affected if The server processes chunked HTTP requests from clients.
  4. Inspect configuration for chunked encoding handling
    Examine records.config for proxy.config.http.insert_request_via_if and related chunking settings. Look for proxy.config.http.allow_http10_to_http11_responses and any custom chunking-related modifications.
    Affected if Default chunked encoding handling is in place without additional input validation rules.

A user is affected if Apache Traffic Server is configured as a proxy, handles chunked transfer encoding requests, and runs a version between 9.0.0-9.2.9 or 10.0.0-10.0.4.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Upgrade available Upgrade to 9.2.10 / 10.0.5 or later
Fixed in 9.2.1010.0.5
Interim mitigation

Upgrade Apache Traffic Server to version 9.2.10 or 10.0.5 to address the vulnerability. If immediate upgrading is not possible, implement strict input validation at upstream proxies and monitor for anomalous request patterns.

Recommended fix High confidence

Upgrade to Apache Traffic Server 9.2.10 or 10.0.5 (depending on your current major version)

  1. 1. Identify the currently installed Apache Traffic Server version using 'traffic_server -V' or equivalent
  2. 2. Determine which version branch is currently in use (9.x or 10.x)
  3. 3. Download the appropriate fixed version (9.2.10 for 9.x users, 10.0.5 for 10.x users) from the official Apache Traffic Server downloads page
  4. 4. Stop the Traffic Server service before upgrading
  5. 5. Install the new version using the package manager or build from source as appropriate for your deployment
  6. 6. Verify the new version is installed correctly with 'traffic_server -V'
  7. 7. Start the Traffic Server service and verify normal operation
  8. 8. Test that the server properly handles malformed chunked requests to confirm the vulnerability is resolved
Caveat Standard upgrade; review release notes for any configuration or behavioral changes between versions

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Traffic Server Scoped from the published advisory
  • Consultation2.0 h
  • Implementation3.0 h
  • Testing4.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,900
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An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,040.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2024-53868 in production — separate from our analysis above.

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What this is

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.

What belongs here
  • 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