CVE-2020-23899

Application crash via invalid TGA memory write

Published Nov 10, 2021 · Updated Aug 4, 2024

Out-of-bounds write in WildBit Viewer 6.6 allows context-dependent attackers to crash the application via a crafted TGA file. During TGA processing, Editor+0x5f91 performs a locked compare-and-exchange byte write through invalid address 0xf0f0f0f0, causing a user-mode access violation. Opening the file is required, and the documented consequence is an application crash rather than data disclosure or modification.

CVSS severity5.5
Medium
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

Out-of-bounds write in WildBit Viewer 6.6 allows context-dependent attackers to crash the application via a crafted TGA file. During TGA processing, Editor+0x5f91 performs a locked compare-and-exchange byte write through invalid address 0xf0f0f0f0, causing a user-mode access violation. Opening the file is required, and the documented consequence is an application crash rather than data disclosure or modification.

The record

CVE
CVE-2020-23899
Published
Nov 10, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 10, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
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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