CVE-2021-33707Network attack vector

Unauthenticated phishing redirects via malicious favorites

Published Aug 10, 2021 · Updated Aug 3, 2024

SAP NetWeaver Knowledge Management allows remote attackers to redirect users to phishing sites through a stored URL. The default SAP Portal Web Dynpro tc~kmc~wdui~favorites/FavoritesApplication accepts a malicious Favorite and redirects its user-supplied destination without authentication. Exploitation requires a victim to activate the crafted favorite, after which the browser leaves the trusted portal for an attacker-controlled site.

CVSS severity6.1
Medium
EPSS probability1.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SAP NetWeaver Knowledge Management allows remote attackers to redirect users to phishing sites through a stored URL. The default SAP Portal Web Dynpro tc~kmc~wdui~favorites/FavoritesApplication accepts a malicious Favorite and redirects its user-supplied destination without authentication. Exploitation requires a victim to activate the crafted favorite, after which the browser leaves the trusted portal for an attacker-controlled site.

The record

CVE
CVE-2021-33707
Published
Aug 10, 2021
Updated
Aug 3, 2024
Vendor
SAP SE
Product
SAP NetWeaver Knowledge Management
Classifications
CWE-601, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 10, 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=< 7.30
  2. Affected versionversion=< 7.31
  3. Affected versionversion=< 7.40
  4. Affected versionversion=< 7.50

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SAP SE · SAP NetWeaver Knowledge Managementversion=< 7.30; version=< 7.31; version=< 7.40; version=< 7.50

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1SAP SECVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.8NIST NVDAV:N/AC:M/Au:N/C:P/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1204.001Malicious Link

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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