CVE-2021-33691Network attack vector

Session data exposure via unencoded notification input

Published Sep 15, 2021 · Updated Aug 3, 2024

Cross-site scripting in SAP NWDI Notification Service before 7.31, 7.40, and 7.50 allows remote attackers to access active session data. The service places user-controlled notification input into browser-rendered content without sufficient encoding; SAP has not identified the affected parameter or function. Exploitation requires a victim with an active session to execute the crafted script, exposing session information and permitting limited session changes.

CVSS severity6.9
Medium
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in SAP NWDI Notification Service before 7.31, 7.40, and 7.50 allows remote attackers to access active session data. The service places user-controlled notification input into browser-rendered content without sufficient encoding; SAP has not identified the affected parameter or function. Exploitation requires a victim with an active session to execute the crafted script, exposing session information and permitting limited session changes.

The record

CVE
CVE-2021-33691
Published
Sep 15, 2021
Updated
Aug 3, 2024
Vendor
SAP SE
Product
SAP NetWeaver Development Infrastructure (Notification Service)
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 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=< 7.31
  2. Affected versionversion=< 7.40
  3. Affected versionversion=< 7.50

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SAP SE · SAP NetWeaver Development Infrastructure (Notification Service)version=< 7.31; version=< 7.40; version=< 7.50

Published CVSS scores

6.9SAP SECVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV: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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