SolarWinds Serv-U
YES - ON THE CISA KEV LIST
CVE-2021-35247
SolarWinds Serv-U Improper Input Validation Vulnerability
overdue since 2022-02-04
SolarWinds: 11 entries (0.6% of all KEV entries are from this vendor); 4 added in 2026.
BOD 26-04 note: this is the date printed in the CISA catalog. A federal agency's actual deadline is set by its SSVC tier - Act (3 days), Attend (14 days), Track (60 days), or the next scheduled upgrade - counted from the KEV listing date or the date the vulnerability is identified in its environment, whichever comes first. Use the tier helper on each CVE page for your own window.
Your BOD 26-04 window (SSVC tier helper)
Your remediation window ends:
Description
SolarWinds Serv-U versions 15.2.5 and earlier contain an improper input validation vulnerability that allows attackers to build and send queries without sanitization.
Required action (CISA)
Apply updates per vendor instructions.
Notes
https://nvd.nist.gov/vuln/detail/CVE-2021-35247
References
Other KEV entries for this vendor: SolarWinds
- CVE-2026-28318 - Serv-U (2026-06-05)
- CVE-2025-26399 - Web Help Desk (2026-03-09)
- CVE-2025-40536 - Web Help Desk (2026-02-12)
- CVE-2025-40551 - Web Help Desk (2026-02-03)
- CVE-2024-28987 - Web Help Desk (2024-10-15)
- CVE-2024-28986 - Web Help Desk (2024-08-15)
- CVE-2024-28995 - Serv-U (2024-07-17)
- CVE-2020-10148 - Orion (2021-11-03)
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