CVE-2020-8195· NVD / CVE Program· CNA hackerone

Improper input validation 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

Improper input validation 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.

MediumCVSS 6.5 · v3.1KEVWeaponized No fix recorded

BDU:2021-04814

Published: Jul 10, 2020
Updated: Jun 16, 2026
EPSS: 33.0% · 98th percentile
CWE: CWE-20

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Action score

This week

Don’t wait for the next maintenance window.

CVSS: 26 / 40 · 6.5 / 10
CISA KEV: 30 / 30 · Listed
EPSS: 10 / 30 · 33.0%

CISA SSVC decision

Exploitation: active
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Nov 3, 2021. That signals real attacks, not theory.

Remediation deadline for government agencies: May 3, 2022.

Noroxi analysis

No Noroxi analysis for this record yet

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Affected systems

Vendor	Product	CPE
citrix	application delivery controller firmware	cpe:2.3:o:citrix:application_delivery_controller_firmware
citrix	netscaler gateway firmware	cpe:2.3:o:citrix:netscaler_gateway_firmware
citrix	gateway firmware	cpe:2.3:o:citrix:gateway_firmware
citrix	sd-wan wanop	cpe:2.3:o:citrix:sd-wan_wanop
citrix	4000-wo	cpe:2.3:h:citrix:4000-wo
citrix	4100-wo	cpe:2.3:h:citrix:4100-wo
citrix	5000-wo	cpe:2.3:h:citrix:5000-wo
citrix	5100-wo	cpe:2.3:h:citrix:5100-wo
citrix	gateway plug-in for linux	cpe:2.3:a:citrix:gateway_plug-in_for_linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

citrix application delivery controller firmware11.1 and later · before 11.1-64.14
citrix application delivery controller firmware12.0 and later · before 12.0-63.21
citrix application delivery controller firmware12.1 and later · before 12.1-57.18
citrix application delivery controller firmware13.0 and later · before 13.0-58.30
citrix application delivery controller firmware10.5 and later · before 10.5-70.18
citrix gateway firmware13.0 and later · before 13.0-58.30
citrix gateway plug-in for linuxbefore 1.0.0.137
citrix netscaler gateway firmware12.1 and later · before 12.1-57.18
citrix netscaler gateway firmware11.1 and later · before 11.1-64.14
citrix netscaler gateway firmware10.5 and later · before 10.5-70.18
citrix netscaler gateway firmware12.0 and later · before 12.0-63.21
citrix sd-wan wanop10.2 and later · before 10.2.7
citrix sd-wan wanop11.0 and later · before 11.0.3d
citrix sd-wan wanop11.1 and later · before 11.1.1a

Versions reported by the vendor

Affected version ranges reported by the assigning authority (hackerone). Independent of NVD's CPE analysis and usually ahead of it.

n/a Citrix ADC, Citrix Gateway, Citrix SDWAN WAN-OP
- Citrix ADC and Citrix Gateway 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 11.1.1a, 11.0.3d and 10.2.7affected

Same product

citrix: all records

Other highest-scoring records for the same primary product.

CVE-2019-19781An issue was discovered in Citrix Application Delivery Controller (ADC) and Gateway 10.5, 11.1, 12.0, 12.1, and 13.0.KEV
99Now
CVE-2020-8193Improper 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 CKEV
83Now
CVE-2022-27518Unauthenticated remote arbitrary code executionKEV
71This week
CVE-2020-8196Improper 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 CKEV
55Plan
CVE-2018-7218The AppFirewall functionality in Citrix NetScaler Application Delivery Controller and NetScaler Gateway 10.5 before Build 68.7, 11.0 before
41Plan
CVE-2019-18225An issue was discovered in Citrix Application Delivery Controller (ADC) and Gateway before 10.5 build 70.8, 11.x before 11.1 build 63.9, 12.
39Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

PublishedJul 10, 2020
CISA KEVNov 3, 2021+480 d
TodayOct 2, 2026+2275 d

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope