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CVE-2020-28473

23
FAUCET Score

CVE-2020-28473 is a web cache poisoning vulnerability affecting the Bottle web framework (versions prior to 0.12.19) and its Debian packages. This medium-severity flaw (CVSS 6.8) allows attackers to manipulate how proxies and servers interpret requests using "parameter cloaking" via semicolons, leading to malicious responses being cached as legitimate. While the attack requires user interaction and high attack complexity, it can result in significant integrity and availability impacts. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.12.19CPE matchmatch criteria
cpe:2.3:a:bottlepy:bottle:*:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.8MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.6
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.76%
Probability of exploitation in next 30 days
EPSS Percentile
75.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0176 is in the 83rd percentile among its peer group of 705 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.2 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

pippatch availablevia ghsa
Product: bottleFixed in: 0.12.19

Vendor Advisories (1)

pipGHSA-qhx9-7hx7-cp4rmedium

bottle HTTP Request smuggling

Apr 7, 2021

References

github.com / bottlepy/bottle
ProductThird Party Advisory
lists.debian.org / debian-lts-announce/2021/01/msg00019.html
Third Party Advisory
snyk.io / blog/cache-poisoning-in-popular-open-source-packages
Third Party Advisory
snyk.io / vuln/SNYK-PYTHON-BOTTLE-1017108
ExploitThird Party Advisory