Critical

Previously patched Citrix NetScaler flaw exploited in the wild (CVE-2026-8452)

Help Net Security

August 27, 2026 at 9:58 AM

Actively Exploited

Overview

The Cybersecurity and Infrastructure Security Agency (CISA) has added a previously patched vulnerability in Citrix NetScaler ADC and Gateway, known as CVE-2026-8452, to its Known Exploited Vulnerabilities catalog. This memory overflow flaw can lead to unpredictable behavior and potential denial of service. Citrix disclosed the issue on June 30, 2026, and CISA alerted federal agencies to address it by August 29, 2026. The fact that this vulnerability is being actively exploited poses a significant risk to organizations using affected Citrix products, emphasizing the urgency for timely remediation. As attackers are taking advantage of this vulnerability, companies must prioritize applying the necessary patches to safeguard their systems.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: Citrix NetScaler ADC and Gateway
Action Required: Agencies were instructed to remediate the vulnerability by August 29, 2026.
Timeline: Disclosed on June 30, 2026

Original Article Summary

CISA added six new vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog, including a previously patched Citrix NetScaler ADC and Gateway flaw, tracked as CVE-2026-8452, that is being exploited in the wild. The agency published the alert on August 26 and gave federal agencies until August 29 to remediate it. About CVE-2026-8452 Citrix disclosed the issue on June 30, 2026, describing CVE-2026-8452 as a “memory overflow vulnerability leading to unpredictable or erroneous behavior and denial … More → The post Previously patched Citrix NetScaler flaw exploited in the wild (CVE-2026-8452) appeared first on Help Net Security.

Impact

Citrix NetScaler ADC and Gateway

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Disclosed on June 30, 2026

Remediation

Agencies were instructed to remediate the vulnerability by August 29, 2026. Specific patch details were not provided in the article, but organizations should apply any available patches from Citrix to mitigate the risk.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to CVE, Vulnerability.

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