Is CVE-2018-11773 actively exploited?

No active exploitation of CVE-2018-11773 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2018-11773 be exploited remotely?

Yes. CVE-2018-11773 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2018-11773?

CVE-2018-11773 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2018-11773

CWE-20Published: July 29, 2019· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Apache VCL versions 2.1 through 2.5 do not properly validate form input when processing a submitted block allocation. The form data is then used as an argument to the php built in function strtotime. This allows for an attack against the underlying implementation of that function. The implementation of strtotime at the time the issue was discovered appeared to be resistant to a malicious attack. However, all VCL systems running versions earlier than 2.5.1 should be upgraded or patched. This vulnerability was found and reported to the Apache VCL project by ADLab of Venustech.

NVD Source

Technical Analysis

CVE-2018-11773 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.