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CVE-2020-8193

Citrix ADC, Gateway, and SD-WAN WANOP Appliance Authorization Bypass

6.5 MEDIUMActively exploited (CISA KEV)Public exploitEPSS 88.4%
  1. Published10 Jul 2020
  2. Added to CISA KEV3 Nov 2021
  3. Remediation due3 May 2022
Actively exploited (CISA KEV)

Citrix ADC, Citrix Gateway, and multiple Citrix SD-WAN WANOP appliance models contain an authorization bypass vulnerability that may allow unauthenticated access to certain URL endpoints. The attacker must have access to the NetScaler IP (NSIP) in order to perform exploitation.

Added to KEV: 3 Nov 2021Federal remediation due: 3 May 2022

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected products

Citrix Application Delivery Controller Firmware≥ 10.5 < 10.5-70.18 · ≥ 11.1 < 11.1-64.14 · ≥ 12.0 < 12.0-63.21 · ≥ 12.1 < 12.1-57.18
Citrix Gateway Firmware≥ 13.0 < 13.0-58.30
Citrix NetScaler Gateway Firmware≥ 10.5 < 10.5-70.18 · ≥ 11.1 < 11.1-64.14 · ≥ 12.0 < 12.0-63.21 · ≥ 12.1 < 12.1-57.18
Citrix SD-WAN Wanop≥ 10.2 < 10.2.7 · ≥ 11.0 < 11.0.3d · ≥ 11.1 < 11.1.1a

Remediation

Fixed in
Citrix Application Delivery Controller Firmware≥ 10.5-70.18
Citrix Gateway Firmware≥ 13.0-58.30
Citrix NetScaler Gateway Firmware≥ 10.5-70.18
Citrix SD-WAN Wanop≥ 10.2.7

References

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Frequently asked

Is CVE-2020-8193 being actively exploited?

Yes. CVE-2020-8193 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 3 Nov 2021.

How severe is CVE-2020-8193?

CVE-2020-8193 has a CVSS 3.1 base score of 6.5, rated medium. EPSS estimates a 88.4% probability of exploitation.

Which products are affected by CVE-2020-8193?

Affected products include Citrix Application Delivery Controller Firmware, Citrix Gateway Firmware, Citrix NetScaler Gateway Firmware, Citrix SD-WAN Wanop.

How do I fix CVE-2020-8193?

Upgrade affected software to a fixed version, for example Citrix Application Delivery Controller Firmware 10.5-70.18, Citrix Gateway Firmware 13.0-58.30, Citrix NetScaler Gateway Firmware 10.5-70.18 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2020-8193 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.