Bleepingcomputer Active Exploitation of SolarWinds Serv-U Flaw CVE-2026-28318
Article Content
- •CISA warns of active exploitation of CVE-2026-28318 in SolarWinds Serv-U software.
- •The vulnerability allows attackers to crash the service without authentication.
- •Over 12,000 Serv-U servers are currently exposed online, heightening the risk.
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has issued a warning regarding the active exploitation of a high-severity vulnerability in SolarWinds Serv-U, tracked as CVE-2026-28318. This flaw allows remote attackers to crash the Serv-U service using specially crafted POST requests without requiring authentication. The vulnerability stems from uncontrolled resource consumption and affects both Windows and Linux versions of Serv-U. SolarWinds released a hotfix (15.5.4 Hotfix 1) on June 4, 2026, to address this issue. CISA has added this CVE to its Known Exploited Vulnerabilities Catalog and mandated that all Federal Civilian Executive Branch agencies patch their servers by June 19, 2026. There are over 12,000 Serv-U servers exposed online, increasing the risk of exploitation. Administrators are advised to limit access to known addresses and block specific POST requests until the patch can be applied.
Ask AI about this cluster
Answers cite the sources they use
Timeline
More articles in this cluster (14)
Following this threat?
Track Dev-0322, SolarWinds and CVE-2021-35211 in your own feed — you're alerted when they show up in new reporting, leak sites or exploitation.
Free account · no card needed
Continue Reading
Critical BeyondTrust 9.3 Vulnerability Actively Exploited by Threat Actor A critical vulnerability (CVE-2026-102764) in BeyondTrust Remote Support has been discovered and is actively being exploited by the threat group ARMORY CASTLE, reportedly linked to China. The vulnerability, which has a CVSS score of 9.3, allows unauthenticated attackers to upload files and potentially compromise host… 
Lazarus APT Launches Operation FlashHole Using AI and Post-Quantum Cryptography Kaspersky has identified a cyberespionage campaign, dubbed Operation FlashHole, attributed to the Lazarus APT group, active since July 2025. The campaign has targeted at least three organizations in South Korea's construction, software, and wire-communication sectors. Attack methods include spear-phishing emails…