What is CVE-2020-8196?

CVE-2020-8196 is a medium-severity vulnerability in Citrix 4000-Wo, classified under Improper Access Control. CVSS score: 4.3/10. Published 2020-07-10.

How severe is CVE-2020-8196?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Is CVE-2020-8196 known to be exploited?

Yes. CVE-2020-8196 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 14 public proof-of-concept repositories are indexed.

Auth bypass in Citrix 4000-Wo

CVE-2020-8196

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.

Published 2020-07-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.263 (98.0th percentile), scored 2026-10-18.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.263 · newest: 0.263 · change: 0.000

Affected products

Citrix 4000-Wo
Citrix 4100-Wo
Citrix 5000-Wo
Citrix 5100-Wo
Citrix Application Delivery Controller Firmware
Citrix Gateway Firmware
Citrix Netscaler Gateway Firmware
Citrix Sd-Wan Wanop
Citrix Adc, Gateway, Sdwan Wan-Op — versions 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 10.2.7

Weakness classification (CWE)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2021-11-03. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-05-03.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

support.citrix.com/article/CTX276688 (Vendor Advisory)
packetstormsecurity.com/files/160047/Citrix-ADC-NetScaler-Local-File-Inclusion… (VDB Entry, Third Party Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2020-8196?: CVE-2020-8196 is a medium-severity vulnerability in Citrix 4000-Wo, classified under Improper Access Control. CVSS score: 4.3/10. Published 2020-07-10.
How severe is CVE-2020-8196?: Medium severity. CVSS v3 base score is 4.3 out of 10.
Is CVE-2020-8196 known to be exploited?: Yes. CVE-2020-8196 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 14 public proof-of-concept repositories are indexed.