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PHPApplication

CVE-2025-1734

MEDIUM · 5.3 CVSS v3.1 Published 2025-03-30
Fix available
A fix is available. Upgrade to 8.1.32 / 8.2.28 or later.
See remediation →
62/100
Remediation priority · Elevated
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
In PHP from 8.1.* before 8.1.32, from 8.2.* before 8.2.28, from 8.3.* before 8.3.19, from 8.4.* before 8.4.5, when receiving headers from HTTP server, the headers missing a colon (:) are treated as valid headers even though they are not. This may confuse applications into accepting invalid headers.

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

PHP's HTTP server header parsing incorrectly accepts headers missing the required colon (:) separator as valid. This malformed header acceptance can cause web applications to process unexpected or manipulated header data, potentially leading to logic errors or confusion in header handling routines.

MitigationUpgrade PHP to version 8.1.32, 8.2.28, 8.3.19, or 8.4.5 or later. Application code that processes HTTP headers should also validate header format compliance with the HTTP specification.

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
PHPApplication
Affected:>= 8.1.0, < 8.1.32>= 8.2.0, < 8.2.28>= 8.3.0, < 8.3.19>= 8.4.0, < 8.4.5
OntapApplication
Affected:= 9

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
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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 installed PHP version
    Run `php -v` or `php --version` from command line to see the exact PHP version number
    Affected if The version falls within 8.1.0-8.1.31, 8.2.0-8.2.27, 8.3.0-8.3.18, or 8.4.0-8.4.4
  2. Check if PHP built-in server is in use
    Look for PHP processes running with `-S` flag (e.g., `php -S localhost:8000`) via `ps aux | grep php` or check startup scripts for `php -S` commands
    Affected if The PHP built-in development server is actively running
  3. Verify header processing behavior
    Send a malformed HTTP request with a header line missing the colon (e.g., `GET / HTTP/1.1\r\nHost: example.com\r\nBadHeader\r\n\r\n`) to the PHP server and observe how it handles the header
    Affected if The server accepts and processes the header without rejecting it as malformed
  4. Check NetApp ONTAP PHP component if applicable
    For NetApp ONTAP systems, identify any PHP-based web services or APIs (check running services, web interface components)
    Affected if ONTAP version 9 is running with PHP-based web services exposed

You are affected if you run PHP versions 8.1.x before 8.1.32, 8.2.x before 8.2.28, 8.3.x before 8.3.19, or 8.4.x before 8.4.5 as a built-in HTTP server that processes incoming HTTP headers.

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 8.1.32 / 8.2.28 / 8.3.19 or later
Fixed in 8.1.328.2.288.3.19
Interim mitigation

Upgrade PHP to version 8.1.32, 8.2.28, 8.3.19, or 8.4.5 or later. Application code that processes HTTP headers should also validate header format compliance with the HTTP specification.

Recommended fix High confidence

PHP 8.1.32, 8.2.28, 8.3.19, or 8.4.5 (recommended: latest 8.4.x = 8.4.5)

  1. Identify your current PHP version using 'php -v'
  2. Determine which PHP major version line you are using (8.1.x, 8.2.x, 8.3.x, or 8.4.x)
  3. For PHP 8.1.x: Upgrade to PHP 8.1.32 or later
  4. For PHP 8.2.x: Upgrade to PHP 8.2.28 or later
  5. For PHP 8.3.x: Upgrade to PHP 8.3.19 or later
  6. For PHP 8.4.x: Upgrade to PHP 8.4.5 or later
  7. Use your system's package manager to perform the upgrade (e.g., apt update && apt install php* for Debian/Ubuntu, yum update php* for RHEL/CentOS, or pecl upgrade for PECL installs)
  8. Verify the new version using 'php -v'
Caveat Minor version upgrades typically have minimal breaking changes; review PHP release notes for any deprecation notices or behavioral changes in your version line

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

Fix this in PHP Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing8.0 h
  • Review / QA2.0 h
16.0 hours of engineering $2,680
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,288.

Scan for this in your stack

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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-2025-1734 in production — separate from our analysis above.

No notes yet

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

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