How severe is CVE-2020-8193?

CVE-2020-8193 has a CVSS score of 6.5/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which products are affected by CVE-2020-8193?

CVE-2020-8193 affects the following products: citrix application delivery controller firmware, citrix gateway firmware, citrix netscaler gateway firmware, citrix sd-wan wanop.

How do I patch CVE-2020-8193?

Apply the citrix application delivery controller firmware security patch or hotfix for CVE-2020-8193 on the affected version, following the vendor advisory for your exact build.

How do I detect CVE-2020-8193 across my infrastructure?

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

How do I mitigate CVE-2020-8193 if there is no patch (or I can't update yet)?

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.

Is CVE-2020-8193 actively exploited in the wild?

Yes. There are 10 known exploit references for CVE-2020-8193, including 6 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2020-8193?

CVE-2020-8193 has an EPSS (Exploit Prediction Scoring System) score of 88.3%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2020-8193 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2020-8193 (Citrix ADC, Gateway, and SD-WAN WANOP Appliance Authorization Bypass Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2021-11-03. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-05-03. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2020-8193?

CVE-2020-8193 is classified as CWE-284 (CWE-284), Improper Authentication (CWE-287). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2020-8193?

CVE-2020-8193 affects citrix application delivery controller firmware; citrix gateway firmware; citrix netscaler gateway firmware; citrix sd-wan wanop. Check the affected-products list on this page against your deployed version to confirm exposure.

Is there exploit tooling available for CVE-2020-8193?

A Nuclei detection template exists for CVE-2020-8193, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2020-8193 published, and has it been updated?

CVE-2020-8193 was published on July 10, 2020 and was last updated on June 17, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🛡️

CISA KEV · ACTIVELY EXPLOITED

MEDIUM severity

CVE-2020-8193 — Application Delivery Controller Firmware

MEDIUM

CVE-2020-8193 is a medium-severity (CVSS 6.5) 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

Jul 10, 2020

Updated

Jun 17, 2026

Affected

4 products

Patched

See advisory

Exploits

10 known

Exploitation data as of Oct 23, 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.
CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2020-8193.

EPSS Exploitation Probability

via FIRST.org ↗

88.3%probability of exploitation in next 30 days

Very High Risk-0.14%

Lower risk than most CVEs100th percentile — riskier than 100% of all scored CVEsHighest risk

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

How urgent is this, really

CVE-2020-8193 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 395,249 CVEs with a current EPSS score, this one falls in the 50–90% 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 allows unauthenticated access to certain URL endpoints.

Affected Products

4 products · 13 configurations

application delivery controller firmwarecitrix

≥ 13.0 && < 13.0-58.30

range

gateway firmwarecitrix

≥ 13.0 && < 13.0-58.30

range

netscaler gateway firmwarecitrix

≥ 12.1 && < 12.1-57.18

range

sd-wan wanopcitrix

≥ 11.1 && < 11.1.1a

range

Exploits & PoCs

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