Exploited vulnerabilities / CVE-2026-8452
Confirmed exploited · denial of service · Citrix NetScaler ADC and NetScaler GatewayCVE-2026-8452
Citrix NetScaler ADC and NetScaler Gateway denial of service, confirmed exploited in the wild.
Citrix NetScaler ADC and NetScaler Gateway contain an improper restriction of operations within the bounds of a memory buffer vulnerability which could lead to denial of service.
| CISA's name for it | Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability |
|---|---|
| Vendor and product | Citrix · NetScaler ADC and NetScaler Gateway |
| Type | denial of service · CWE-119 |
| Exploited | Confirmed by CISA listed 26 August 2026 |
| Likelihood | scored lower by EPSS, but already confirmed exploited, which outranks any prediction |
| Deadline | 29 August 2026 · already passed |
| Used in ransomware | Not reported |
| Advisories | support.citrix.com ↗ · www.cisa.gov ↗ · www.cisa.gov ↗ · nvd.nist.gov ↗ |
Three steps, in this order
Apply the vendor's fix or mitigation; CISA lists only vulnerabilities seen exploited.
If you cannot patch now, restrict network access to the affected product.
Check for signs of compromise since the date it was added to the list.
| CISA's required action | Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. |
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Know before someone else finds it
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CVE-2026-8452 in short
Is CVE-2026-8452 being exploited?
Yes. CISA added CVE-2026-8452 to its Known Exploited Vulnerabilities catalogue on 26 August 2026, which it does only on evidence of exploitation in the wild.
What is the CISA deadline for CVE-2026-8452?
US federal agencies must remediate it by 29 August 2026. Everyone else should treat that date as the latest safe point to patch an internet-facing system.
How likely is CVE-2026-8452 to be exploited in the next 30 days?
FIRST's Exploit Prediction Scoring System gives it 1.0%, the 63rd percentile of every CVE it scores.
How do I fix CVE-2026-8452?
Apply the vendor's fix or mitigation; CISA lists only vulnerabilities seen exploited. If you cannot patch now, restrict network access to the affected product. Check for signs of compromise since the date it was added to the list.
Other Citrix vulnerabilities being exploited
| CVE | Product | Type | Listed |
|---|---|---|---|
| CVE-2026-88779 | NetScaler | denial of service | 4 October 2026 |
| CVE-2026-88772 | NetScaler | remote code execution | 27 September 2026 |
| CVE-2026-88771 | NetScaler | exploited vulnerability | 27 September 2026 |
| CVE-2026-19490 | NetScaler | authentication bypass | 9 September 2026 |
| CVE-2026-3055 | NetScaler | memory corruption | 30 March 2026 |
Sources: CISA Known Exploited Vulnerabilities catalogue (released 10 November 2026) and FIRST EPSS. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 13 November 2026.