CISA Adds Six Bugs to KEV Catalog
CISA added six actively exploited vulnerabilities—including flaws in Citrix NetScaler, SQL Server, and Linux kernel—to its Known Exploited Vulnerabilities catalog.
Sourcecisa.gov — open the original
What to check
- Applies to
- The 6 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- CISA lists CVE-2015-3246, CVE-2015-5287, CVE-2019-1068, CVE-2021-23758, CVE-2022-0995, and CVE-2026-8452 as exploited in the wild.
CISA has updated its Known Exploited Vulnerabilities (KEV) Catalog with six new CVEs based on confirmed evidence of active exploitation. The list spans a range of products and ages, including older Red Hat Libuser and ABRT flaws, a 2019 Microsoft SQL Server RCE, a 2021 Ajax.NET Professional deserialization bug, a 2022 Linux kernel out-of-bounds write issue, and a newly disclosed Citrix NetScaler ADC/Gateway memory-corruption vulnerability (CVE-2026-8452). The inclusion of older CVEs alongside a fresh Citrix flaw underscores that legacy unpatched systems remain viable attack vectors for adversaries.
Under Binding Operational Directive (BOD) 26-04, FCEB agencies must prioritize remediation of KEV-listed vulnerabilities on internet-facing assets that could grant full post-exploitation control, and must verify whether systems were compromised prior to patching. While BOD 26-04 is mandatory only for federal civilian agencies, CISA recommends all organizations adopt similar risk-based patching priorities, particularly for the Citrix NetScaler vulnerability given the product's history as a high-value target for both criminal and state-sponsored actors.
Defenders should inventory affected products (Red Hat systems with Libuser/ABRT, Microsoft SQL Server, Ajax.NET Professional deployments, vulnerable Linux kernel versions, and Citrix NetScaler ADC/Gateway) and apply vendor patches immediately, with priority given to internet-exposed Citrix NetScaler instances given the severity and active exploitation of CVE-2026-8452.
Mentioned in this report
Source reporting: https://www.cisa.gov/news-events/alerts/2026/08/26/cisa-adds-six-known-exploited-vulnerabilities-catalog
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