Threats / Citrix / CVE-2020-8193
CVE-2020-8193
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-08-04
Citrix Application Delivery Controller (ADC), Gateway, and S vulnerability
Citrix ADC, Gateway, and SD-WAN WANOP appliances contain an authorization bypass allowing unauthenticated access to certain URL endpoints when the attacker has network access to the NetScaler IP.
Verdict
Today item — known-exploited.
An unauthenticated attacker with network access to the management interface can bypass authorization controls to access restricted endpoints, potentially leading to information disclosure or further system compromise.
CISA KEV Yes · 2021-11-035EPSS 0.88411 (verify live)6Exploit Weaponized · public PoC7CVSS 6.5 (CISA)4CISA SSVC Exploitation: active · Automatable: yes · Impact: partial4
01
Is it exploitable?
— the evidence, ranked above the scoreExploit available
Fully weaponized — public exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
640 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03).
Probability (EPSS)
EPSS 0.88411 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N) · Affected: Citrix, Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance. Confirm exact fixed builds in the vendor advisory.CVSS — CISA-assigned via the ADP container (CVE.org), version 3.1; the CNA left no metrics, so CISA's own score is used ahead of NVD.
Weakness (CWE)
Mapped to CWE-284 Improper Access Control — weakness family: Authorization / access control.CWE — CNA-assigned (CVE.org); the weakness class drives how the flaw is exploited.
CISA SSVC (triage disposition)
Exploitation: active · Automatable: yes · Technical Impact: partialCISA's own stakeholder-specific triage inputs, published in the CVE record (CISA Coordinator role). NOTE: this is CISA's three decision points; the final Act/Attend/Track decision also requires a Mission & Well-being input not published here, so no overall decision is asserted.
Currency of the record
CISA added this to its KEV catalog 481 days after the CVE record was published.KEV lag = CISA-KEV dateAdded − CVE.org datePublished; a floor on how long the known-exploited flaw sat in the public record before the federal catalog listed it. Severity/weakness here is CNA- or CISA-assigned (current at disclosure), independent of NVD's analysis backlog.
Public exploit available
Public exploit tooling is catalogued for this CVE (a public proof-of-concept / detection template). Catalog entries: nuclei template. We link the catalog page(s) only — no payload or code is hosted or restated here.Link, never host — the catalog page is the source; basicsecurity.net does not redistribute payloads.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
Gain network access to the NetScaler IP management interface
Business
Perimeter security assumes internal network is trusted; exposed management interfaces become attack surface
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
Craft requests to protected URL endpoints without valid authentication credentials
Business
Authorization controls fail to enforce access restrictions, violating principle of least privilege
3
Lateral reach — past segmentation narrative 3
Attacker
Access sensitive configuration, operational data, or system information from restricted endpoints
Business
Confidential appliance settings and operational details are exposed to unauthorized parties
4
Data at risk — exfiltration narrative 4
Attacker
Use disclosed information to identify further vulnerabilities or misconfigurations
Business
Information disclosure enables reconnaissance for lateral movement or privilege escalation attacks
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05