CVE-2021-21456Network attack vector

Code execution via out-of-bounds DIB parser write

Published Jan 12, 2021 · Updated Aug 3, 2024

Out-of-bounds write in SAP 3D Visual Enterprise Viewer before 9 allows remote attackers to execute code through a crafted DIB file. The DIB parser fails to validate user-supplied dimensions or offsets before writing past the end of an allocated data structure. Exploitation requires the target to open a malicious file or page and runs code in the current process; malformed input can instead crash the Viewer until restart.

CVSS severity4.3
Medium
EPSS probability1.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in SAP 3D Visual Enterprise Viewer before 9 allows remote attackers to execute code through a crafted DIB file. The DIB parser fails to validate user-supplied dimensions or offsets before writing past the end of an allocated data structure. Exploitation requires the target to open a malicious file or page and runs code in the current process; malformed input can instead crash the Viewer until restart.

The record

CVE
CVE-2021-21456
Published
Jan 12, 2021
Updated
Aug 3, 2024
Vendor
SAP SE
Product
SAP 3D Visual Enterprise Viewer
Classifications
CWE-787, T1203, T1204.002
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=< 9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SAP SE · SAP 3D Visual Enterprise Viewerversion=< 9

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.3SAP SECVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

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-787Out-of-bounds Write
T1203Exploitation for Client Execution
T1204.002Malicious File

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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