HOMEVULNERABILITIESCVE-2016-7398
CRITICAL

CVE-2016-7398

CWE-704Published: September 6, 2019· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

A type confusion vulnerability in the merge_param() function of php_http_params.c in PHP's pecl-http extension 3.1.0beta2 (PHP 7) and earlier as well as 2.6.0beta2 (PHP 5) and earlier allows attackers to crash PHP and possibly execute arbitrary code via crafted HTTP requests.

NVD Source

Technical Analysis

CVE-2016-7398 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

PHP1 product(s)
ext-http
Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/m6w6/ext-http/commit/17137d4ab1ce81a2cee0fae842340a344ef3da83
PATCHhttps://github.com/m6w6/ext-http/commit/17137d4ab1ce81a2cee0fae842340a344ef3da83
ADVISORYhttps://bugs.php.net/bug.php?id=73055
ADVISORYhttps://bugs.php.net/bug.php?id=73055&edit=1
ADVISORYhttps://bugs.php.net/bug.php?id=73055
ADVISORYhttps://bugs.php.net/bug.php?id=73055&edit=1

All References (8)

→
https://bugs.php.net/bug.php?id=73055Exploit · Mailing List · Vendor Advisory
→
https://bugs.php.net/bug.php?id=73055&edit=1Exploit · Vendor Advisory
→
https://github.com/m6w6/ext-http/commit/17137d4ab1ce81a2cee0fae842340a344ef3da83Patch · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2019/09/msg00022.html
→
https://bugs.php.net/bug.php?id=73055Exploit · Mailing List · Vendor Advisory
→
https://bugs.php.net/bug.php?id=73055&edit=1Exploit · Vendor Advisory
→
https://github.com/m6w6/ext-http/commit/17137d4ab1ce81a2cee0fae842340a344ef3da83Patch · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2019/09/msg00022.html

Quick Facts

CVE IDCVE-2016-7398
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-704
CISA KEVNo
Affected1 vendor(s)
PublishedSep 6, 2019

Related CVEs (CWE-704)

CVE-2015-3120
10.0
CVE-2018-12812
9.8
CVE-2016-7979
9.8
CVE-2011-2337
9.8
CVE-2018-4944
9.8
CVE-2020-25576
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2016-7398 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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