Original release date: August 21, 2021
Malicious cyber actors are actively exploiting the following ProxyShell vulnerabilities: CVE-2021-34473, CVE-2021-34523, and CVE-2021-31207. An attacker exploiting these vulnerabilities could execute arbitrary code on a vulnerable machine. CISA strongly urges organizations to identify vulnerable systems on their networks and immediately apply Microsoft’s Security Update from May 2021—which remediates all three ProxyShell vulnerabilities—to protect against these attacks.
This product is provided subject to this Notification and this Privacy & Use policy.
CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence…
CISA released eight Industrial Control Systems (ICS) Advisories. These advisories provide timely information about current…
CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence…
CISA released 10 Industrial Control Systems (ICS) advisories. These advisories provide timely information about current…
CISA has added five new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence…
CISA released one Industrial Control Systems (ICS) advisory on October 14, 2025. These advisories provide…
This website uses cookies.