CVE-2020-36994Public exploitHinoki check available

Application crash via oversized FTP server address

Published Jan 29, 2026 · Updated Jan 29, 2026

Buffer overflow in Qlik QlikView 12.50.20000.0 allows local users to crash the application through the FTP server address field. The Open FTP workflow copies a 300-character address without checking the destination buffer size, terminating QlikView when Connect is selected. Exploitation requires interactive access to the Windows desktop and interrupts only the local application process; no data disclosure or modification is reported.

CVSS severity4.6
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Buffer overflow in Qlik QlikView 12.50.20000.0 allows local users to crash the application through the FTP server address field. The Open FTP workflow copies a 300-character address without checking the destination buffer size, terminating QlikView when Connect is selected. Exploitation requires interactive access to the Windows desktop and interrupts only the local application process; no data disclosure or modification is reported.

The record

CVE
CVE-2020-36994
Published
Jan 29, 2026
Updated
Jan 29, 2026
Vendor
Qlik
Product
QlikView
Classifications
CWE-120, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=12.50.20000.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Qlik · QlikViewversion=12.50.20000.0

Published CVSS scores

6.2VulnCheckCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.6VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

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.

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No observations available

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

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Application or System Exploitation

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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