CISA Adds One Known Exploited Vulnerability to Catalog
CISA added actively exploited Citrix NetScaler flaw CVE-2026-88779 to the KEV catalog.
CISA added CVE-2026-88779, a Citrix NetScaler improper restriction of operations within a memory buffer, to the Known Exploited Vulnerabilities Catalog based on evidence of active exploitation. The agency said this vulnerability class is a frequent attack vector and poses significant risk to the federal enterprise. Binding Operational Directive 26-04 requires federal civilian agencies to prioritize rapid remediation of high-risk KEV entries on publicly exposed assets and to check for compromise before patching. CISA encouraged all organizations to prioritize KEV remediation.
- CVE-2026-88779 is a Citrix NetScaler memory-bounds flaw
- CISA added it to KEV after evidence of active exploitation
- BOD 26-04 requires FCEB agencies to prioritize exposed KEV flaws
- CISA urges all organizations to remediate KEV vulnerabilities quickly
Vulnerabilities mentionedAll →
- CVE-2026-887798.7<1%Unauthenticated denial of service in NetScaler ADC and Gatewaypublished · Citrix NetScaler ADC KEV
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2026-88779 | Unauthenticated denial of service in NetScaler ADC and Gateway CVE-2026-88779 is a high-severity vulnerability (CVSS 4.0 base score 8.7) in Citrix NetScaler ADC and NetScaler Gateway. CVSS metrics indicate it can be triggered remotely over the network with low complexity, no privileges, and no user interaction; the advisory text does not name a specific bug class or request path. Impact is limited to high loss of availability on the vulnerable appliance, with no confidentiality or integrity impact scored for the device or for subsequent systems, which is consistent with denial of service. Affected products are NetScaler ADC before 14.1-73.41, before 13.1-64.28, before 14.1-73.41 FIPS, and before 13.1-37.282, and NetScaler Gateway before 14.1-73.41 and before 13.1-64.28. It is not listed in CISA KEV, and no public proof-of-concept is known. |
Full article230 words · extracted from cisa.gov · click to collapse
CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation.
- CVE-2026-88779 Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
This type of vulnerability is a frequent attack vector for malicious cyber actors and poses significant risks to the federal enterprise.
Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk establishes vulnerability management requirements for Federal Civilian Executive Branch (FCEB) agencies. BOD 26-04 reinforces the importance of the KEV Catalog and requires federal agencies to prioritize rapid remediation of high-risk vulnerabilities, specifically those identified by Common Vulnerabilities and Exposures (CVEs) listed in CISA’s KEV Catalog on publicly exposed assets that grant total control of the asset post-exploitation, while deferring action for lower-risk vulnerabilities. BOD 26-04 further establishes basic expectations for when agencies must check whether threat actors compromised the system before the patch was applied.
While BOD 26-04 applies only to FCEB agencies, CISA encourages all organizations to adopt risk-based vulnerability management and prioritize remediation of KEV Catalog vulnerabilities. CISA will continue to add vulnerabilities to the catalog that meet the specified criteria.
Aware of an exploited vulnerability not currently listed in the KEV Catalog? Submit it for potential addition through CISA’s KEV Nomination Form. Potential KEV additions must have a CVE ID, evidence of exploitation, and clear mitigation guidance.
Text extracted automatically; images, tables and formatting may be missing. Original: https://www.cisa.gov/news-events/alerts/2026/10/04/cisa-adds-one-known-exploited-vulnerability-catalog