HOMEVULNERABILITIESCVE-2021-26635
HIGH

CVE-2021-26635

CWE-121Published: June 2, 2022· Updated: Jun 17, 2026

7.8
CVSS v3.1

Official Description

In the code that verifies the file size in the ark library, it is possible to manipulate the offset read from the target file due to the wrong use of the data type. An attacker could use this vulnerability to cause a stack buffer overflow and as a result, perform an attack such as remote code execution.

NVD Source

Technical Analysis

CVE-2021-26635 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected Vendors & Products

bandisoft1 product(s)
ark library
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://www.krcert.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=66747
ADVISORYhttps://www.krcert.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=66747

All References (2)

→
https://www.krcert.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=66747Broken Link · Third Party Advisory
→
https://www.krcert.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=66747Broken Link · Third Party Advisory

Quick Facts

CVE IDCVE-2021-26635
CVSS Score7.8 / 10
SeverityHIGH
WeaknessCWE-121
CISA KEVNo
Affected1 vendor(s)
PublishedJun 2, 2022

Related CVEs (CWE-121)

CVE-2026-37541
10.0
CVE-2023-3943
10.0
CVE-2020-14498
10.0
CVE-2026-42996
10.0
CVE-2014-0787
10.0
CVE-2026-12846
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-26635 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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