CVE-2020-27249Network attack vector

Code execution via oversized Office Art record

Published Feb 4, 2021 · Updated Aug 4, 2024

Heap-based buffer overflow in SoftMaker PlanMaker 2021 Revision 1014 allows remote attackers to execute code via a crafted Excel document. CEscherObject::ReadNativeProperties trusts a 32-bit length in a 0xf150 Office Art record and copies that many bytes into a 0x64-byte member at offset 0x9dc. Exploitation requires a victim to open the document; the overwrite corrupts the process heap and enables code execution in the application context.

CVSS severity8.8
High
EPSS probability1.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in SoftMaker PlanMaker 2021 Revision 1014 allows remote attackers to execute code via a crafted Excel document. CEscherObject::ReadNativeProperties trusts a 32-bit length in a 0xf150 Office Art record and copies that many bytes into a 0x64-byte member at offset 0x9dc. Exploitation requires a victim to open the document; the overwrite corrupts the process heap and enables code execution in the application context.

The record

CVE
CVE-2020-27249
Published
Feb 4, 2021
Updated
Aug 4, 2024
Vendor
SoftMaker Software GmbH
Product
PlanMaker
Classifications
CWE-787, CWE-122, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 4, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=SoftMaker Software GmbH SoftMaker Office PlanMaker 2021 (Revision 1014)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SoftMaker Software GmbH · PlanMakerversion=SoftMaker Software GmbH SoftMaker Office PlanMaker 2021 (Revision 1014)

Published CVSS scores

8.8Cisco TalosCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST National Vulnerability DatabaseAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/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

CWE-787Out-of-bounds Write
CWE-122Heap-based Buffer Overflow
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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