# CVE-2020-28473: bottle HTTP Request smuggling

Source: https://junglewise.ai/threats/cve-2020-28473-bottle-http-request-smuggling  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-01-18  
License: CC BY 4.0 with a link back

CVE-2020-28473 · Severity: low · CVSS 3.1 · Published 2021-01-18

The package bottle from 0 and before 0.12.19 are vulnerable to Web Cache Poisoning by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon (;), they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server. This can result in malicious requests being cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and therefore would not include it in a cache key of an unkeyed parameter.

Technologies: [bottle (PyPI)](https://junglewise.ai/threats/technologies/bottle). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2020-28473 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2020-28473 being exploited in the wild.

**How severe is CVE-2020-28473?** Low severity, with a CVSS score of 3.1, published 18 January 2021.

**Which products and versions are affected?** bottle (PyPI) ECOSYSTEM:introduced=0,fixed=0.12.19.

**Is there a fix for CVE-2020-28473?** Yes. bottle (PyPI): upgrade to 0.12.19 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2020-28473?** Check whether you run bottle (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- bottle (PyPI): upgrade to 0.12.19 or later

  ```sh
  pip install "bottle>=0.12.19"
  ```


## Affected products

- bottle (PyPI) ECOSYSTEM:introduced=0,fixed=0.12.19

## Identifiers

- CVE-2020-28473
- GHSA-qhx9-7hx7-cp4r
- PYSEC-2021-129

## Related threats

- [PYSEC-2022-227 - Bottle before 0.12.20 mishandles errors during early request binding.](https://junglewise.ai/threats/cve-2022-31799-denial-of-service-in-bottle)
- [bottle.py vulnerable to CRLF Injection](https://junglewise.ai/threats/cve-2016-9964-bottle-py-vulnerable-to-crlf-injection)
- [Bottle does not properly limit content-types](https://junglewise.ai/threats/cve-2014-3137-bottle-does-not-properly-limit-content-types)