How severe is CVE-2019-12044?

CVE-2019-12044 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2019-12044 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-12044?

CVE-2019-12044 primarily affects Citrix Netscaler Gateway Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-12044?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-12044 published?

CVE-2019-12044 was published on 2019-05-22 and last updated on 2026-06-17.

CVE-2019-12044

CVE-2019-12044 is a high-severity vulnerability in Citrix Netscaler Gateway Firmware with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Citrix Netscaler Gateway Firmware
Published: 2019-05-22
Last modified: 2026-06-17

Description

A Buffer Overflow exists in Citrix NetScaler Gateway 10.5.x before 10.5.70.x, 11.1.x before 11.1.59.10, 12.0.x before 12.0.59.8, and 12.1.x before 12.1.49.23 and Citrix Application Delivery Controller 10.5.x before 10.5.70.x, 11.1.x before 11.1.59.10, 12.0.x before 12.0.59.8, and 12.1.x before 12.1.49.23.

Frequently asked questions

What is CVE-2019-12044?: A Buffer Overflow exists in Citrix NetScaler Gateway 10.5.x before 10.5.70.x, 11.1.x before 11.1.59.10, 12.0.x before 12.0.59.8, and 12.1.x before 12.1.49.23 and Citrix Application Delivery Controller 10.5.x before 10.5.70.x, 11.1.x before 11.1.59.10, 12.0.x before 12.0.59.8, and 12.1.x before 12.1.49.23.
How severe is CVE-2019-12044?: CVE-2019-12044 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2019-12044 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-12044?: CVE-2019-12044 primarily affects Citrix Netscaler Gateway Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-12044?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-12044 published?: CVE-2019-12044 was published on 2019-05-22 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:o:citrix:netscaler_gateway_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:citrix:netscaler_application_delivery_controller_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Citrix Netscaler Gateway Firmware

CVE-2015-5538 — Critical (CVSS 10.0): Multiple unspecified vulnerabilities in Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway…
CVE-2019-19781 — Critical (CVSS 9.8): An issue was discovered in Citrix Application Delivery Controller (ADC) and Gateway 10.5, 11.1, 12.0, 12.1, and 13.0.…
CVE-2019-18225 — Critical (CVSS 9.8): An issue was discovered in Citrix Application Delivery Controller (ADC) and Gateway before 10.5 build 70.8, 11.x before…
CVE-2018-7218 — Critical (CVSS 9.8): The AppFirewall functionality in Citrix NetScaler Application Delivery Controller and NetScaler Gateway 10.5 before…
CVE-2018-6809 — Critical (CVSS 9.8): NetScaler ADC 10.5, 11.0, 11.1, and 12.0, and NetScaler Gateway 10.5, 11.0, 11.1, and 12.0 allow remote attackers to…
CVE-2015-5080 — Critical (CVSS 9.0): The Management Interface in Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway 10.1 before…

All CVEs affecting Citrix Netscaler Gateway Firmware →

Other CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities

CVE-2026-2778 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability was fixed in…
CVE-2026-2776 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability…
CVE-2025-1866 — Critical (CVSS 10.0): Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in warmcat libwebsockets allows…
CVE-2022-27625 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
CVE-2022-27624 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
CVE-2020-11896 — Critical (CVSS 10.0): The Treck TCP/IP stack before 6.0.1.66 allows Remote Code Execution, related to IPv4 tunneling.

Browse all CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities →