VulnerabilityPublished 15 Apr 2025Updated 24 Oct 2025

CVE-2025-33027: Bandisoft Bandizip · Inclusion of Web Functionality from an Untrusted Source

Affects Bandisoft BandizipSource CVE Database V5

Not known to be exploited · CVSS 6.1 Medium.

Data as of 26 Oct 2026, 11:42 UTC

CVSS 3.1 base score

6.1Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 21% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Changed
Confidentiality: Low
Integrity: Low
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 15 Apr 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Bandisoft Bandizip	Affected =0	Fixed in–

AI-suggested

European organizations should implement the following specific mitigations: 1) Monitor Bandisoft announcements and apply patches promptly once available to address CVE-2025-33027. 2) Enforce strict policies on handling archives from untrusted or unknown sources, including scanning all compressed files with updated antivirus and endpoint detection tools before extraction. 3) Educate users about the risks of opening archives from untrusted origins and the importance of heeding security warnings, even if MotW is bypassed. 4) Consider restricting Bandizip usage to trusted users or replacing it with archive tools that correctly propagate MotW attributes. 5) Implement application whitelisting and execution control policies to prevent unauthorized code execution from user directories where extracted files reside. 6) Employ network-level protections such as email filtering and web content filtering to reduce the delivery of malicious archives. 7) Use endpoint detection and response (EDR) solutions to detect suspicious behaviors related to archive extraction and code execution. These measures, combined with user awareness, will reduce the risk of exploitation beyond generic advice.

Description

In Bandisoft Bandizip through 7.37, there is a Mark-of-the-Web Bypass Vulnerability. This vulnerability allows attackers to bypass the Mark-of-the-Web protection mechanism on affected installations of Bandizip. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the handling of archived files. When extracting files from a crafted archive that bears the Mark-of-the-Web, Bandizip does not propagate the Mark-of-the-Web to the extracted files. An attacker can leverage this vulnerability to execute arbitrary code in the context of the current user. NOTE: this is disputed because Mark-of-the-Web propagation can increase risk via security-warning habituation, and because the intended control sphere for file-origin metadata (e.g., HostUrl in Zone.Identifier) may be narrower than that for reading the file's content.

Impact

For European organizations, this vulnerability poses a moderate risk primarily to end-user systems where Bandizip is used to extract files from untrusted or external sources. Successful exploitation can lead to arbitrary code execution with the privileges of the current user, potentially enabling attackers to install malware, steal sensitive information, or move laterally within a network. The bypass of MotW reduces the effectiveness of Windows security warnings, increasing the likelihood of users executing malicious files unknowingly. Sectors with high reliance on compressed archives, such as finance, government, and critical infrastructure, may face increased exposure. Although the vulnerability does not allow privilege escalation or direct availability impact, the confidentiality and integrity of data can be compromised. The requirement for user interaction limits automated exploitation but does not eliminate risk, especially in environments with frequent file exchanges or phishing campaigns. The absence of known exploits in the wild suggests limited current threat but does not preclude future exploitation.

Summary

CVE-2025-33027 is a vulnerability identified in Bandisoft Bandizip versions through 7.37, related to the improper handling of the Mark-of-the-Web (MotW) security feature. MotW is a Windows security mechanism that tags files downloaded from the internet or other untrusted sources to warn users and restrict certain actions. Bandizip fails to propagate the MotW attribute from archived files to the extracted files. This flaw allows attackers to craft malicious archives that, when extracted, produce files without the MotW tag, effectively bypassing Windows security warnings and restrictions. The vulnerability is classified under CWE-830, which involves the inclusion of web functionality from untrusted sources, potentially enabling execution of malicious web content or scripts. Exploitation requires user interaction, such as opening a malicious archive or visiting a malicious webpage that triggers archive extraction. Successful exploitation can lead to arbitrary code execution in the context of the current user, potentially compromising confidentiality and integrity of user data. The CVSS v3.1 base score is 6.1 (medium), reflecting network attack vector, low attack complexity, no privileges required, but user interaction needed, with partial confidentiality and integrity impact and no availability impact. No public exploits are currently known, and the vulnerability is disputed regarding the security implications of MotW propagation. However, the risk remains significant for users who extract files from untrusted sources using Bandizip.

CWE-830Inclusion of Web Functionality from an Untrusted Source (opens in a new tab)
Variant weaknessOWASP Top 10 A08:2025: Software or Data Integrity Failures (opens in a new tab)
The product includes web functionality (such as a web widget) from another domain, which causes it to operate within the domain of the product, potentially granting total access and control of the product to the untrusted source.
OWASP Cheat Sheets
Unvalidated Redirects and Forwards (opens in a new tab)
XML Security (opens in a new tab)
XML External Entity Prevention (opens in a new tab)
File Upload (opens in a new tab)
Input Validation (opens in a new tab)
OWASP ASVS 4.0.3
V5.3.6 (opens in a new tab)
V12.3.6 (opens in a new tab)
V14.2.3 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 24 Oct 2025, 19:50 UTC

WeaknessesCWE-830

Technical details

References

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