CASCACascade Atlas

Evidence dossier

CVE-2021-35247

Improper Input Validation Vulnerability in Serv-U

54.4–71.9Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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.

State
PUBLISHED
Published
Jan 7, 2022
Updated
Oct 21, 2025
Evidence coverage
72%
CISA KEVCatalog member

Apply updates per vendor instructions.

FIRST EPSS3.36%

2026-07-18 · v2026.06.15 · percentile 87.4%

Source stateConflict visible

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

CVEderivative copy
container

CVE Program Container

SolarWindsoriginal assertion
container

Improper Input Validation Vulnerability in Serv-U

CISA KEVoriginal assertion
observed_exploitation

SolarWinds Serv-U Improper Input Validation Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.033590000000; percentile 0.873680000000

Applicability

Cited product scope

Trace impact →
SolarWindsServ-U
[{"status": "affected", "version": "15.2.5 and previous versions", "lessThan": "15.3", "versionType": "custom"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:solarwinds:serv-u:*:*:*:*:*:*:*:*; end excluding 15.3supported

Assessments

CVSS by origin

5.3
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
5.0
nvd@nist.govCVSS 2.0 · role PrimaryAV:N/AC:L/Au:N/C:N/I:P/A:N
4.3
psirt@solarwinds.comCVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
4.3
SolarWindsCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.