CVE-2021-26635

Code execution via incompatible file-offset handling

Published Jun 1, 2022 · Updated Aug 3, 2024

Stack-based buffer overflow in Bandisoft ARK Library 7.17 and earlier allows attackers to execute code after a user opens a crafted file. The file-size verification code interprets an offset read from the target file with the wrong data type, allowing the value to drive a stack-buffer overwrite. Exploitation requires user interaction with a malicious file; successful corruption can execute code in the consuming application's context.

CVSS severity7.8
High
EPSS probability1.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Bandisoft ARK Library 7.17 and earlier allows attackers to execute code after a user opens a crafted file. The file-size verification code interprets an offset read from the target file with the wrong data type, allowing the value to drive a stack-buffer overwrite. Exploitation requires user interaction with a malicious file; successful corruption can execute code in the consuming application's context.

The record

CVE
CVE-2021-26635
Published
Jun 1, 2022
Updated
Aug 3, 2024
Vendor
Bandisoft International Inc.
Product
ARK Library
Classifications
CWE-121, CWE-843, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 1, 2022CVE 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=unspecified <=7.17

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Bandisoft International Inc. · ARK Libraryversion=unspecified <=7.17

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8KrCERT/CCCVSS: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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
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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