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CISA Adds Actively Exploited SolarWinds Web Help Desk RCE to KEV Catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Tuesday added a critical security flaw impacting SolarWinds Web Help Desk (WHD) to its Known Exploited Vulnerabilities (KEV) catalog, flagging it as actively exploited in attacks. The vulnerability, tracked as CVE-2025-40551 (CVSS score: 9.8), is a untrusted data deserialization vulnerability that could pave the way for remote code execution. "SolarWinds Web Help Desk contains a deserialization of untrusted data vulnerability that could lead to remote code execution, which would allow an attacker to run commands on the host machine," CISA said. "This could be exploited without authentication." SolarWinds issued fixes for the flaw last week, along with CVE-2025-40536 (CVSS score: 8.1), CVE-2025-40537 (CVSS score: 7.5), CVE-2025-40552 (CVSS score: 9.8), CVE-2025-40553 (CVSS score: 9.8), and CVE-2025-40554 (CVSS score: 9.8), in WHD version 2026.1. There are currently no public reports about how the vulnerability is being weaponized in attacks, who may be the targets, or the scale of such efforts. It's the latest illustration of how quickly threat actors are moving to exploit newly disclosed flaws. Also added to the KEV catalog are three other vulnerabilities - It's worth noting that the exploitation of CVE-2021-39935 was highlighted by GreyNoise in March 2025, as part of a coordinated surge in the abuse of SSRF vulnerabilities in multiple platforms, including DotNetNuke, Zimbra Collaboration Suite, Broadcom VMware vCenter, ColumbiaSoft DocumentLocator, BerriAI LiteLLM, and Ivanti Connect Secure. Federal Civilian Executive Branch (FCEB) agencies are required to fix CVE-2025-40551 by February 6, 2026, and the rest by February 24, 2026, pursuant to Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities.