HOMEVULNERABILITIESCVE-2019-9021
CRITICAL

CVE-2019-9021

CWE-125Published: February 22, 2019· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

An issue was discovered in PHP before 5.6.40, 7.x before 7.1.26, 7.2.x before 7.2.14, and 7.3.x before 7.3.1. A heap-based buffer over-read in PHAR reading functions in the PHAR extension may allow an attacker to read allocated or unallocated memory past the actual data when trying to parse the file name, a different vulnerability than CVE-2018-20783. This is related to phar_detect_phar_fname_ext in ext/phar/phar.c.

NVD Source

Technical Analysis

CVE-2019-9021 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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Canonical1 product(s)
ubuntu linux
Debian1 product(s)
debian linux
netapp1 product(s)
storage automation store
openSUSE1 product(s)
leap
PHP1 product(s)
php
Source: NVD CPE · 7 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://bugs.php.net/bug.php?id=77247
PATCHhttps://bugs.php.net/bug.php?id=77247
ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-04/msg00083.html
ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-04/msg00104.html
ADVISORYhttp://www.securityfocus.com/bid/106747
ADVISORYhttp://www.securityfocus.com/bid/107156
ADVISORYhttps://security.netapp.com/advisory/ntap-20190321-0001/
ADVISORYhttps://usn.ubuntu.com/3902-1/
ADVISORYhttps://usn.ubuntu.com/3902-2/
ADVISORYhttps://www.debian.org/security/2019/dsa-4398
ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-04/msg00083.html
ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-04/msg00104.html
ADVISORYhttp://www.securityfocus.com/bid/106747
ADVISORYhttp://www.securityfocus.com/bid/107156
ADVISORYhttps://security.netapp.com/advisory/ntap-20190321-0001/
ADVISORYhttps://usn.ubuntu.com/3902-1/
ADVISORYhttps://usn.ubuntu.com/3902-2/
ADVISORYhttps://www.debian.org/security/2019/dsa-4398

All References (26)

→
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00083.htmlMailing List · Third Party Advisory
→
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00104.htmlMailing List · Third Party Advisory
→
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00041.html
→
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00044.html
→
http://www.securityfocus.com/bid/106747Third Party Advisory · VDB Entry
→
http://www.securityfocus.com/bid/107156Third Party Advisory · VDB Entry
→
https://access.redhat.com/errata/RHSA-2019:2519
→
https://access.redhat.com/errata/RHSA-2019:3299
→
https://bugs.php.net/bug.php?id=77247Exploit · Issue Tracking · Patch · Vendor Advisory
→
https://security.netapp.com/advisory/ntap-20190321-0001/Third Party Advisory
→
https://usn.ubuntu.com/3902-1/Third Party Advisory
→
https://usn.ubuntu.com/3902-2/Third Party Advisory
→
https://www.debian.org/security/2019/dsa-4398Third Party Advisory
→
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00083.htmlMailing List · Third Party Advisory
→
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00104.htmlMailing List · Third Party Advisory

Quick Facts

CVE IDCVE-2019-9021
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-125
CISA KEVNo
Affected5 vendor(s)
PublishedFeb 22, 2019

Related CVEs (CWE-125)

CVE-2021-41556
10.0
CVE-2009-2523
10.0
CVE-2021-21777
10.0
CVE-2013-0767
10.0
CVE-2017-14451
10.0
CVE-2023-26489
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-9021 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. CVE data is provided under the NVD usage policy.
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