CVE-2021-21446Network attack vector

Service interruption via parallel demo execution

Published Jan 12, 2021 · Updated Aug 3, 2024

Denial of service in SAP NetWeaver AS ABAP 740 through 755 allows remote attackers to crash or flood an application service. The web ABAP Keyword Documentation permits overlapping execution of demo examples, causing user locks and service-unavailable responses. The documentation ICF service must be enabled and reachable; successful abuse interrupts availability but does not read or modify data.

CVSS severity7.5
High
EPSS probability1.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in SAP NetWeaver AS ABAP 740 through 755 allows remote attackers to crash or flood an application service. The web ABAP Keyword Documentation permits overlapping execution of demo examples, causing user locks and service-unavailable responses. The documentation ICF service must be enabled and reachable; successful abuse interrupts availability but does not read or modify data.

The record

CVE
CVE-2021-21446
Published
Jan 12, 2021
Updated
Aug 3, 2024
Vendor
SAP SE
Product
SAP NetWeaver AS ABAP
Classifications
T1499.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 12, 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=< 740
  2. Affected versionversion=< 750
  3. Affected versionversion=< 751
  4. Affected versionversion=< 752
  5. Affected versionversion=< 753
  6. Affected versionversion=< 754
  7. Affected versionversion=< 755

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SAP SE · SAP NetWeaver AS ABAPversion=< 740; version=< 750; version=< 751; version=< 752; version=< 753; version=< 754; version=< 755

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5SAP SECVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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

T1499.002Service Exhaustion Flood

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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