CVE-2020-13879Network attack vector

Process-memory corruption via out-of-bounds heap write

Published Jan 5, 2024 · Updated Apr 17, 2025

Heap-based out-of-bounds write in the B3D plug-in for IrfanView before 4.56 allows attackers to corrupt process memory via unspecified vectors. The published report identifies B3d.dll offset +0x214f as the write site but does not disclose the input field, parser operation, or missing bounds check. The public evidence establishes process-memory corruption as the consequence; the triggering input path and any resulting code execution are not established.

CVSS severity9.8
Critical
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

Heap-based out-of-bounds write in the B3D plug-in for IrfanView before 4.56 allows attackers to corrupt process memory via unspecified vectors. The published report identifies B3d.dll offset +0x214f as the write site but does not disclose the input field, parser operation, or missing bounds check. The public evidence establishes process-memory corruption as the consequence; the triggering input path and any resulting code execution are not established.

The record

CVE
CVE-2020-13879
Published
Jan 5, 2024
Updated
Apr 17, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 5, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 17, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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

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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