Home/CVE/SolarWinds Serv-U Improper Input Validation Vulnerability
CVE

CVE-2021-35247

SolarWinds Serv-U Improper Input Validation Vulnerability

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.

MEDIUM · CVSS 4.3 ⚠ CISA KEV EPSS 0.05345
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • SSVC exploitation status: active
  • EPSS percentile: top 10% of all CVEs by exploitation likelihood
Sigma rules1 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

⬡

Weakness Classification

CWE-20Improper Input Validation
▤

Affected Products & Versions

1
solarwinds serv-u< 15.3
◈

Sigma Hunt Rules

1
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighSuspicious Serv-U Process Pattern
▣

Scoring & Timeline

4.3
MEDIUM · CVSS v3.1 · psirt@solarwinds.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD10 Jan 2022 · 02:10 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
cisaKEV-CVE-2021-35247
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3_release_notes.htmRelease NotesVendor Advisory
https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35247Broken LinkVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35247US Government Resource
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