What is CVE-2021-35247?

CVE-2021-35247 is a medium-severity vulnerability in Solarwinds Serv-U, classified under Improper Input Validation. CVSS score: 4.3/10. Published 2022-01-10.

How severe is CVE-2021-35247?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Is CVE-2021-35247 known to be exploited?

Yes. CVE-2021-35247 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-01-21), indicating it is being actively exploited. 5 public proof-of-concept repositories are indexed.

Improper input validation in Solarwinds Serv-U

CVE-2021-35247

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.035 (88.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

Affected products

Solarwinds Serv-u — versions 15.2.5 and previous versions

Weakness classification (CWE)

CWE-20 — Improper Input Validation

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2022-01-21. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-02-04.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

psirt@solarwinds.com (x_refsource_MISC, Broken Link, Vendor Advisory)
psirt@solarwinds.com (x_refsource_MISC, Release Notes, Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2021-35247?: CVE-2021-35247 is a medium-severity vulnerability in Solarwinds Serv-U, classified under Improper Input Validation. CVSS score: 4.3/10. Published 2022-01-10.
How severe is CVE-2021-35247?: Medium severity. CVSS v3 base score is 4.3 out of 10.
Is CVE-2021-35247 known to be exploited?: Yes. CVE-2021-35247 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-01-21), indicating it is being actively exploited. 5 public proof-of-concept repositories are indexed.