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CISA KEV · ACTIVELY EXPLOITED
MEDIUM severity

CVE-2020-8196 — Application Delivery Controller Firmware

MEDIUM

CVE-2020-8196 is a medium-severity (CVSS 4.3) CWE-284 vulnerability in citrix application delivery controller firmware. It is in CISA's Known Exploited Vulnerabilities catalog (added 2021-11-03) — treat it as actively exploited and patch now. A fix is available — see the affected versions and patch details below.

Improper access control in Citrix ADC and Citrix Gateway versions before 13.0-58.30, 12.1-57.18, 12.0-63.21, 11.1-64.14 and 10.5-70.18 and Citrix SDWAN WAN-OP versions before 11.1.1a,…

Published
Updated
Affected
4 products
Patched
See advisory
Exploits
1 known
Exploitation data as of Oct 22, 2026 · OSV.dev, NVD, CISA KEV, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

  • Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2021-11-03. Federal agencies were required to remediate by 2022-05-03.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2020-8196.

EPSS Exploitation Probability

via FIRST.org ↗
26.3%probability of exploitation in next 30 days
Moderate Risk0.00%
Lower risk than most CVEs98th percentile — riskier than 98% of all scored CVEsHighest risk
13.8%36.1%58.4%80.6%68.1%26.3%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2020-8196 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 394,803 CVEs with a current EPSS score, this one falls in the 10–50% band (highlighted). Counts from FIRST.org, log-scaled.

Description

Improper access control in Citrix ADC and Citrix Gateway versions before 13.0-58.30, 12.1-57.18, 12.0-63.21, 11.1-64.14 and 10.5-70.18 and Citrix SDWAN WAN-OP versions before 11.1.1a, 11.0.3d and 10.2.7 resulting in limited information disclosure to low privileged users.

Affected Products

4 products · 13 configurations
OS
application delivery controller firmwarecitrix
≥ 13.0 && < 13.0-58.30
range
OS
gateway firmwarecitrix
≥ 13.0 && < 13.0-58.30
range
OS
netscaler gateway firmwarecitrix
≥ 12.1 && < 12.1-57.18
range
OS
sd-wan wanopcitrix
≥ 11.1 && < 11.1.1a
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Improper access control in Citrix ADC and Citrix Gateway versions before…

cisa.govCISAJul 2021

Detection & mitigation playbook

Vendor / appliance

  1. Detect

    Inventory every citrix application delivery controller firmware deployment and check each version against the affected-products list above.

  2. Fix

    Apply the citrix application delivery controller firmware security patch or hotfix for CVE-2020-8196 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

Improper access control in Citrix ADC and Citrix Gateway versions before 13.0-58.30, 12.1-57.18, 12.0-63.21, 11.1-64.14 and 10.5-70.18 and Citrix SDWAN WAN-OP versions before 11.1.1a, 11.0.3d and 10.2.7 resulting in limited information disclosure to low privileged users.
O3 Security · Runtime Protection

Is CVE-2020-8196 being exploited in your environment?

Detect and block the exploit chain at execution, on systems you cannot patch yet.

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CVE-2020-8196: Medium 4.3 (KEV)