A vulnerability (CVE-2026-28318) that can be exploited to crash SolarWinds Serv-U file transfer servers is being leveraged by attackers in the wild, the US Cybersecurity and Infrastructure Security Agency (CISA) confirmed on Friday. The agency has ordered US federal civilian agencies to address it by June 19, 2026, either by implementing a patch or implementing mitigations. About CVE-2026-28318 CVE-2026-28318 is an uncontrolled resource consumption vulnerability that can be triggered by remote, unauthenticated attackers. The flaw … More → The post CISA: Patch actively exploited SolarWinds Serv-U DoS vulnerability (CVE-2026-28318) appeared first on Help Net Security .

U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds SolarWinds Serv-U flaw to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added SolarWinds Serv-U flaw, tracked as CVE-2026-28318 (CVSS ver 3.1 score of 7.5), to its Known Exploited Vulnerabilities (KEV) catalog. SolarWinds Serv-U is a managed file transfer (MFT) and secure file […]

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added a high-severity security flaw impacting SolarWinds Serv-U multi-protocol file server software to its Known Exploited Vulnerabilities (KEV) catalog, citing evidence of active exploitation. The vulnerability, tracked as CVE-2026-28318 (CVSS score: 7.5), is a denial-of-service (DoS) bug that causes the service to crash

CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation. CVE-2026-28318 SolarWinds Serv-U Uncontrolled Resource Consumption 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) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities established the KEV Catalog as a living list of known Common Vulnerabilities and Exposures (CVEs) that carry significant risk to the federal enterprise. BOD 22-01 requires Federal Civilian Executive Branch (FCEB) agencies to remediate identified vulnerabilities by the due date to protect FCEB networks against active threats. See the BOD 22-01 Fact Sheet for more information. Although BOD 22-01 only applies to FCEB agencies, CISA strongly urges all organizations to reduce their exposure to cyberattacks by prioritizing timely remediation of KEV Catalog vulnerabilities as part of their vulnerability management practice. CISA will continue to add vulnerabilities to the catalog that meet the specified criteria . 

SolarWinds Serv-U contains an uncontrolled resource consumption vulnerability that allows specially crafted POST requests using the Content-Encoding: deflate header to crash the Serv-U service without authentication.

SolarWinds has released updates to address four critical security flaws in its Serv-U file transfer software that, if successfully exploited, could result in remote code execution. The vulnerabilities, all rated 9.1 on the CVSS scoring system, are listed below - CVE-2025-40538 - A broken access control vulnerability that allows an attacker to create a system admin user and execute arbitrary