CVE-2019-19943Public exploitNetwork attack vector

Service crash via oversized Host header

Published Feb 28, 2020 · Updated Aug 5, 2024

Heap corruption in quickweb.exe in Pablo Quick 'n Easy Web Server 3.3.8 allows remote attackers to crash the service via an HTTP request. The HTTP service mishandles an oversized Host header and reaches a double free in OLEAUT32!VariantClear after repeated requests corrupt the heap. No authentication or user interaction is required; the published proof of concept demonstrates service interruption, not code execution.

CVSS severity7.5
High
EPSS probability4.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap corruption in quickweb.exe in Pablo Quick 'n Easy Web Server 3.3.8 allows remote attackers to crash the service via an HTTP request. The HTTP service mishandles an oversized Host header and reaches a double free in OLEAUT32!VariantClear after repeated requests corrupt the heap. No authentication or user interaction is required; the published proof of concept demonstrates service interruption, not code execution.

The record

CVE
CVE-2019-19943
Published
Feb 28, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-415, CWE-787, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 28, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-415Double Free
CWE-787Out-of-bounds Write
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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