CISA Adds One Known Exploited Vulnerability to Catalog
CISA added actively exploited Zyxel GS1900 stack buffer overflow CVE-2026-7273 to the Known Exploited Vulnerabilities catalog.
CISA added CVE-2026-7273, a stack-based buffer overflow in Zyxel GS1900 Series switches, to the Known Exploited Vulnerabilities Catalog after evidence of active exploitation. The agency describes this class of flaw as a frequent attack vector that can grant total control of publicly exposed assets. Binding Operational Directive 26-04 requires Federal Civilian Executive Branch agencies to prioritize remediation of such KEV entries and to check for compromise before the patch. CISA urges all organizations to remediate KEV vulnerabilities using risk-based vulnerability management.
- CVE-2026-7273 is a stack-based buffer overflow in Zyxel GS1900 switches.
- CISA cites evidence of active exploitation for the KEV addition.
- BOD 26-04 requires FCEB agencies to prioritize exposed assets granting total control.
- Agencies must check whether systems were compromised before patching.
Vulnerabilities mentionedAll →
- CVE-2026-72738.83%Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerabilitypublished · Zyxel GS1900 Series Switches KEV PoC
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
Full article224 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-2026-7273 Zyxel GS1900 Series Switches Stack-Based Buffer Overflow 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/2026/09/21/cisa-adds-one-known-exploited-vulnerability-catalog