CVE-2021-35228

Victim-browser script execution via unsanitized header field

Published Oct 21, 2021 · Updated Sep 16, 2024

Reflected XSS in SolarWinds Database Performance Analyzer 2021.3.7388 allows man-in-the-middle attackers to execute script in a victim's browser. A page section extracts an output field from attacker-altered headers and reflects it without sanitization. Exploitation requires interception and modification of a remote victim's traffic plus victim interaction, exposing the victim's DPA browser session to script execution.

CVSS severity5.5
Medium
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in SolarWinds Database Performance Analyzer 2021.3.7388 allows man-in-the-middle attackers to execute script in a victim's browser. A page section extracts an output field from attacker-altered headers and reflects it without sanitization. Exploitation requires interception and modification of a remote victim's traffic plus victim interaction, exposing the victim's DPA browser session to script execution.

The record

CVE
CVE-2021-35228
Published
Oct 21, 2021
Updated
Sep 16, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1557
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 21, 2021CVE 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

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

2.6NIST NVDAV:N/AC:H/Au:N/C:N/I:P/A:N
4.7NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
5.5SolarWindsCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1557Adversary-in-the-Middle

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

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Your stack

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