CVE-2021-32604Public exploitNetwork attack vector

Stored XSS via unencoded SenderEmail in share URLs

Published May 11, 2021 · Updated Aug 3, 2024

Stored cross-site scripting in SolarWinds Serv-U before 15.2.3 allows remote authenticated users to execute script via a share URL. The Request Files flow inserts SenderEmail into Share/IncomingWizard.htm without output encoding, preserving injected script in the generated public URL. A low-privileged account must create the link and a victim must open it; the script can alter the upload form and copy submitted files externally.

CVSS severity5.4
Medium
EPSS probability1.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in SolarWinds Serv-U before 15.2.3 allows remote authenticated users to execute script via a share URL. The Request Files flow inserts SenderEmail into Share/IncomingWizard.htm without output encoding, preserving injected script in the generated public URL. A low-privileged account must create the link and a victim must open it; the script can alter the upload form and copy submitted files externally.

The record

CVE
CVE-2021-32604
Published
May 11, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 11, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

Public exploit references

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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