Is CVE-2018-19991 actively exploited?

No active exploitation of CVE-2018-19991 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2018-19991 be exploited remotely?

Yes. CVE-2018-19991 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2018-19991?

CVE-2018-19991 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2018-19991

CRITICAL

CVE-2018-19991

CWE-755Published: December 10, 2018· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

VeryNginx 0.3.3 allows remote attackers to bypass the Web Application Firewall feature because there is no error handler (for get_uri_args or get_post_args) to block the API misuse described in CVE-2018-9230.

NVD Source

Technical Analysis

CVE-2018-19991 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.