CVE-2020-13579Network attack vector

Code execution via integer overflow

Published Feb 4, 2021 · Updated Aug 4, 2024

Integer overflow in SoftMaker PlanMaker 2021 Revision 1014 allows remote attackers to execute code via a crafted document opened by a victim. The parser performs arithmetic on document record data, allocates an undersized heap buffer after the overflow, and then copies data past that allocation. Exploitation requires a victim to open the malicious document; successful memory corruption runs code in the application context.

CVSS severity7.8
High
EPSS probability70.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in SoftMaker PlanMaker 2021 Revision 1014 allows remote attackers to execute code via a crafted document opened by a victim. The parser performs arithmetic on document record data, allocates an undersized heap buffer after the overflow, and then copies data past that allocation. Exploitation requires a victim to open the malicious document; successful memory corruption runs code in the application context.

The record

CVE
CVE-2020-13579
Published
Feb 4, 2021
Updated
Aug 4, 2024
Vendor
SoftMaker Software GmbH
Product
PlanMaker
Classifications
CWE-787, CWE-190, T1203, 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=GmbH SoftMaker Office PlanMaker 2021 (Revision 1014)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

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

Published CVSS scores

8.8TalosCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NISTAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8NISTCVSS: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-190Integer Overflow or Wraparound
T1203Exploitation for Client Execution
T1204.002User Execution: Malicious 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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