CVE-2021-21492Network attack vector

Content spoofing via insufficient logon-group validation

Published Apr 13, 2021 · Updated Aug 3, 2024

Content spoofing in SAP NetWeaver AS for Java HTTP Service 7.10 through 7.50 allows remote attackers to mislead users via crafted URLs. The HTTP Service insufficiently validates the logon-group value embedded in a requested URL and renders directory content under that attacker-controlled context. A victim must follow the crafted link, and only deployments with directory listing enabled expose the spoofed content; no configuration change or service interruption is reported.

CVSS severity4.3
Medium
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Content spoofing in SAP NetWeaver AS for Java HTTP Service 7.10 through 7.50 allows remote attackers to mislead users via crafted URLs. The HTTP Service insufficiently validates the logon-group value embedded in a requested URL and renders directory content under that attacker-controlled context. A victim must follow the crafted link, and only deployments with directory listing enabled expose the spoofed content; no configuration change or service interruption is reported.

The record

CVE
CVE-2021-21492
Published
Apr 13, 2021
Updated
Aug 3, 2024
Vendor
SAP SE
Product
SAP NetWeaver AS for Java HTTP Provider Service
Classifications
CWE-290, T1036
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 13, 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 privilegesunauthenticated

What is affected?

SAP SE · SAP NetWeaver AS for Java HTTP Provider Serviceversion=< 7.10; version=< 7.11; version=< 7.20; version=< 7.30; version=< 7.31; version=< 7.40; version=< 7.50

Published CVSS scores

4.3SAP SECVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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-290Authentication Bypass by Spoofing
T1036Masquerading

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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