CVE-2021-35249Network attack vector

Cross-domain data disclosure via missing authorization

Published May 17, 2022 · Updated Sep 16, 2024

Improper access control in SolarWinds Serv-U 15.3 and earlier allows remote authenticated users to read other domains' configuration and user data. Serv-U's domain-administration authorization logic fails to confine read operations to the administrator's assigned domain. A domain administrator can view, but not modify, another domain's configuration and user records; the unauthorized reads are logged only against the original domain without identifying the accessed domain.

CVSS severity4.3
Medium
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper access control in SolarWinds Serv-U 15.3 and earlier allows remote authenticated users to read other domains' configuration and user data. Serv-U's domain-administration authorization logic fails to confine read operations to the administrator's assigned domain. A domain administrator can view, but not modify, another domain's configuration and user records; the unauthorized reads are logged only against the original domain without identifying the accessed domain.

The record

CVE
CVE-2021-35249
Published
May 17, 2022
Updated
Sep 16, 2024
Vendor
SolarWinds
Product
Serv-U
Classifications
CWE-284, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 17, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=15.3 and previous versions <15.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SolarWinds · Serv-Uversion=15.3 and previous versions <15.3.1

Published CVSS scores

4.3SolarWindsCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1213Data from Information Repositories

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo