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Vulnerability record · CVE-2020-8187 · published 10 July 2020

CVE-2020-8187: Citrix application delivery controller firmware improper input validation vulnerability

Citrix · Application Delivery Controller Firmware

Improper input validation in Citrix ADC and Citrix Gateway versions before 11.1-63.9 and 12.0-62.10 allows unauthenticated users to perform a denial of service attack.

7.5 CVSS 3.1 High EPSS 1.9% · top 20.5% CWE-20 · Improper input validation
7.5CVSS 3.1 base score, v2 5.0
1.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

Improper input validation in Citrix ADC and Citrix Gateway versions before 11.1-63.9 and 12.0-62.10 allows unauthenticated users to perform a denial of service attack.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://support.citrix.com/article/CTX276688 Vendor Advisory
https://support.citrix.com/article/CTX276688 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2022-27518Citrix ADC and Gateway unauthenticated remote code executionCVE-2022-27518 is an unauthenticated remote arbitrary code execution flaw in Citrix Application Delivery Controller (ADC) and Gateway firmware. The C…KEVEPSS 6.7%analysed9.8CVE-2019-19781Citrix ADC and Gateway directory traversal enabling code executionCitrix Application Delivery Controller (ADC) and Gateway versions 10.5, 11.1, 12.0, 12.1, and 13.0 contain a directory traversal flaw (CWE-22). The t…KEVEPSS 100%analysed6.5CVE-2020-8193Citrix ADC and Gateway improper access control allows unauthenticated endpoint accessCitrix ADC, Citrix Gateway, and Citrix SD-WAN WAN-OP contain an improper access control flaw (CWE-284/CWE-287) that lets unauthenticated users reach …KEVEPSS 88%analysed6.5CVE-2020-8195Citrix ADC and Gateway improper input validation information disclosureCitrix ADC, Citrix Gateway, and Citrix SD-WAN WAN-OP contain improper input validation that can result in limited information disclosure to low privi…KEVEPSS 33%analysed4.3CVE-2020-8196Citrix ADC and Gateway improper access control information disclosureCitrix ADC, Citrix Gateway and Citrix SD-WAN WAN-OP appliances contain an improper access control flaw (CWE-284/CWE-287) that allows limited informat…KEVEPSS 26%analysed10.0CVE-2015-5538Citrix netscaler application delivery controller firmware vulnerabilityMultiple unspecified vulnerabilities in Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway before 10.1 Build 132.8, 10.5 be…EPSS 3.2%9.8CVE-2022-27516Citrix gateway improper restriction of authentication attempts vulnerabilityUser login brute force protection functionality bypassEPSS 0.64%9.8CVE-2022-27510Citrix gateway authentication bypass via alternate path vulnerabilityUnauthorized access to Gateway user capabilitiesEPSS 1.1%

Source: NIST National Vulnerability Database (record CVE-2020-8187), CISA KEV, FIRST EPSS (scores of 2026-10-03). This page is refreshed as NVD updates the record.