CISA Adds Four Known Exploited Vulnerabilities to Catalog
CISA added four actively exploited vulnerabilities—Fortinet buffer overflow, Citrix NetScaler and Cisco auth bypasses, and a Chromium V8 write—to the KEV Catalog.
CISA added CVE-2025-25249 (Fortinet heap-based buffer overflow), CVE-2026-19490 (Citrix NetScaler authentication bypass), CVE-2026-87491 (Google Chromium V8 out-of-bounds write), and CVE-2026-20079 (Cisco Firewall Management Center authentication bypass) to its Known Exploited Vulnerabilities Catalog based on evidence of active exploitation. Under Binding Operational Directive 26-04, Federal Civilian Executive Branch agencies must prioritize rapid remediation of these high-risk vulnerabilities on exposed assets and verify whether systems were compromised before patching. CISA encourages all organizations to adopt risk-based vulnerability management and prioritize KEV Catalog remediation.
- Four vulnerabilities added to KEV based on evidence of active exploitation.
- Affected vendors: Fortinet, Citrix NetScaler, Google Chromium V8, Cisco Firewall Management Center.
- BOD 26-04 requires FCEB agencies to rapidly patch high-risk KEV vulnerabilities on exposed assets.
- Agencies must also check whether threat actors compromised systems before patching.
- CISA urges all organizations to prioritize KEV remediation and nominate exploited flaws via its form.
- Organizations
- CISA
Vulnerabilities mentioned
All| CVE | Vulnerability | CVSS | EPSS | Signals | Published |
|---|---|---|---|---|---|
| CVE-2025-25249 | Heap-Based Buffer Overflow in Fortinet FortiOS, FortiSwitchManager, and FortiSASE | 9.8 | 4% | KEVPoC | KEV |
| CVE-2026-19490 | Remote Authentication Bypass in Citrix NetScaler ADC and NetScaler Gateway | 9.3 | 33% | KEVPoC | KEV |
| CVE-2026-20079 | Authentication bypass to root access in Cisco Secure Firewall Management Center | 10.0 | 88% | KEVPoC ×2 | KEV |
| CVE-2026-87491 | Actively Exploited Out-of-Bounds Write in Google Chrome V8 | 8.8 | 4% | KEV | KEV |
From the original article
1 min read at cisa.govCISA has added four new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation.
By CISA · cisa.gov
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