Reference page — cumulative record through Wednesday, October 7, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-35247

CVE-2021-35247MEDIUM

SolarWinds Serv-U — Improper Input Validation Vulnerability in Serv-U

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  U  N  L  N    4.3   .0345   88.7   YES

AFFECTED
  Product  Versions                        Fixed
  Serv-U   15.2.5 and previous versions –  —

TIMELINE
  Jun 22  Reserved by SolarWinds
  Jan 7   Published (CNA: SolarWinds)
  Jan 21  Added to CISA KEV, remediation due 2022-02-04

CWE-20 · CNA: SolarWinds · CVSS v3.1 · 3 references · KEV due February 4, 2022

Description

Serv-U web login screen to LDAP authentication was allowing characters that were not sufficiently sanitized. SolarWinds has updated the input mechanism to perform additional validation and sanitization. Please Note: No downstream affect has been detected as the LDAP servers ignored improper characters. To insure proper input validation is completed in all environments. SolarWinds recommends scheduling an update to the latest version of Serv-U.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 22, 2021	Reserved	Reserved by SolarWinds
January 7, 2022	Published	Published (CNA: SolarWinds)
January 21, 2022	KEV ADDED	Added to CISA KEV, remediation due 2022-02-04

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
SolarWinds	Serv-U	—	15.2.5 and previous versions	—

Weaknesses

CWE-20

References (3)

https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3_release_notes.htm [x_refsource_MISC]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35247 [government-resource]
https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35247 [x_refsource_MISC]

Authoritative record: CVE-2021-35247 at cve.org

Vendors: solarwinds

Weaknesses: CWE-20

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-35247 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, October 7, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.