HOMEVULNERABILITIESCVE-2019-3561
CRITICAL

CVE-2019-3561

CWE-119Published: April 29, 2019· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

Insufficient boundary checks for the strrpos and strripos functions allow access to out-of-bounds memory. This affects all supported versions of HHVM (4.0.3, 3.30.4, and 3.27.7 and below).

NVD Source

Technical Analysis

CVE-2019-3561 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.

From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.

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

facebook1 product(s)
hhvm
Source: NVD CPE · 1 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
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Official Patches & Advisories

ADVISORYhttps://github.com/facebook/hhvm/commit/46003b4ab564b2abcd8470035fc324fe36aa8c75
ADVISORYhttps://hhvm.com/blog/2019/04/03/hhvm-4.0.4.html
ADVISORYhttps://github.com/facebook/hhvm/commit/46003b4ab564b2abcd8470035fc324fe36aa8c75
ADVISORYhttps://hhvm.com/blog/2019/04/03/hhvm-4.0.4.html

All References (4)

→
https://github.com/facebook/hhvm/commit/46003b4ab564b2abcd8470035fc324fe36aa8c75Third Party Advisory
→
https://hhvm.com/blog/2019/04/03/hhvm-4.0.4.htmlVendor Advisory
→
https://github.com/facebook/hhvm/commit/46003b4ab564b2abcd8470035fc324fe36aa8c75Third Party Advisory
→
https://hhvm.com/blog/2019/04/03/hhvm-4.0.4.htmlVendor Advisory

Quick Facts

CVE IDCVE-2019-3561
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-119
CISA KEVNo
Affected1 vendor(s)
PublishedApr 29, 2019

Related CVEs (CWE-119)

CVE-2014-8460
10.0
CVE-2014-7249
10.0
CVE-2014-0589
10.0
CVE-2014-0582
10.0
CVE-2014-8457
10.0
CVE-2014-9223
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-3561 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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