CVE-2021-21490Network attack vector

Session-data theft via unencoded parameters

Published Jun 9, 2021 · Updated Aug 3, 2024

Reflected XSS in SAP NetWeaver AS for ABAP Web Survey on affected releases allows remote attackers to access current-session data through crafted requests. BSP pages fail to encode input and output parameters, allowing attacker-supplied script to execute in a victim's browser context. Exploitation requires a victim to follow or render the crafted request; the script can read session-related data and impersonate that user, with no stated server availability impact.

CVSS severity6.1
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 SAP NetWeaver AS for ABAP Web Survey on affected releases allows remote attackers to access current-session data through crafted requests. BSP pages fail to encode input and output parameters, allowing attacker-supplied script to execute in a victim's browser context. Exploitation requires a victim to follow or render the crafted request; the script can read session-related data and impersonate that user, with no stated server availability impact.

The record

CVE
CVE-2021-21490
Published
Jun 9, 2021
Updated
Aug 3, 2024
Vendor
SAP SE
Product
SAP NetWeaver AS for ABAP (Web Survey)
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 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=< 700
  2. Affected versionversion=< 702
  3. Affected versionversion=< 710
  4. Affected versionversion=< 711
  5. Affected versionversion=< 730
  6. Affected versionversion=< 731
  7. Affected versionversion=< 750
  8. Affected versionversion=< 752
  9. Affected versionversion=< 75A
  10. Affected versionversion=< 75F

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SAP SE · SAP NetWeaver AS for ABAP (Web Survey)version=< 700; version=< 702; version=< 710; version=< 711; version=< 730; version=< 731; version=< 750; version=< 752; version=< 75A; version=< 75F

Published CVSS scores

6.1SAP CNACVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NVDAV:N/AC:M/Au:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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