How severe is CVE-2019-11634?

CVE-2019-11634 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-11634 being actively exploited?

Yes. CVE-2019-11634 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2021-11-03, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2019-11634?

CVE-2019-11634 primarily affects Citrix Receiver. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-11634?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2019-11634 have an EU (EUVD) identifier?

Yes. CVE-2019-11634 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-3304. It is also flagged as exploited in the EUVD (since 2021-11-03).

When was CVE-2019-11634 published?

CVE-2019-11634 was published on 2019-05-22 and last updated on 2026-06-17.

CVE-2019-11634

CVE-2019-11634 is a critical-severity vulnerability in Citrix Receiver with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2021-11-03). The underlying weakness is classified as CWE-284.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 8% (94th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2021-11-03)
EU (EUVD) id: EUVD-2019-3304
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2021-11-03)
Weakness: CWE-284
Affected product: Citrix Receiver
Published: 2019-05-22
Last modified: 2026-06-17

Description

Citrix Workspace App before 1904 for Windows has Incorrect Access Control.

Frequently asked questions

What is CVE-2019-11634?: Citrix Workspace App before 1904 for Windows has Incorrect Access Control.
How severe is CVE-2019-11634?: CVE-2019-11634 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-11634 being actively exploited?: Yes. CVE-2019-11634 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2021-11-03, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2019-11634?: CVE-2019-11634 primarily affects Citrix Receiver. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-11634?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2019-11634 have an EU (EUVD) identifier?: Yes. CVE-2019-11634 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-3304. It is also flagged as exploited in the EUVD (since 2021-11-03).
When was CVE-2019-11634 published?: CVE-2019-11634 was published on 2019-05-22 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:citrix:receiver:4.9:cumulative_update_6:*:*:windows:*:*:*
cpe:2.3:a:citrix:workspace:*:*:*:*:*:windows:*:*

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