CVE-2021-21489Network attack vector

Stored XSS via insufficient user-data encoding

Published Sep 14, 2021 · Updated Aug 3, 2024

Stored XSS in SAP NetWeaver Enterprise Portal 7.10 through 7.50 allows remote authenticated users to read or alter portal content. The portal insufficiently encodes user-related data before rendering it, allowing stored script content to execute in a registered victim's browser. Exploitation requires administrative privileges to store the script and interaction by a registered portal user; no availability impact is reported.

CVSS severity4.8
Medium
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in SAP NetWeaver Enterprise Portal 7.10 through 7.50 allows remote authenticated users to read or alter portal content. The portal insufficiently encodes user-related data before rendering it, allowing stored script content to execute in a registered victim's browser. Exploitation requires administrative privileges to store the script and interaction by a registered portal user; no availability impact is reported.

The record

CVE
CVE-2021-21489
Published
Sep 14, 2021
Updated
Aug 3, 2024
Vendor
SAP SE
Product
SAP NetWeaver Enterprise Portal
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 14, 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?

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

  1. Affected versionversion=< 7.10
  2. Affected versionversion=< 7.11
  3. Affected versionversion=< 7.20
  4. Affected versionversion=< 7.30
  5. Affected versionversion=< 7.31
  6. Affected versionversion=< 7.40
  7. Affected versionversion=< 7.50

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

SAP SE · SAP NetWeaver Enterprise Portalversion=< 7.10; version=< 7.11; version=< 7.20; version=< 7.30; version=< 7.31; version=< 7.40; version=< 7.50

Published CVSS scores

4.8SAP SECVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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