CVE-2020-28473: The package bottle from 0 and before 0.12.19 are vulnerable to Web Cache Poisoning by using a vector called pa

Q: How do I fix CVE-2020-28473?

bottle: upgrade to 0.12.19; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2020-28473 being exploited?

CVE-2020-28473 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-28473 affect?

CVE-2020-28473 affects bottle, debian linux. Severity is medium (CVSS 6.8). 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 interp

Q: How urgent is CVE-2020-28473?

Priority 53/100. Public exploit reference; On your watchlist

This month

MEDIUM 6.8WATCHLISTUPGRADEMITIGATE

CVE-2020-28473 is a medium-severity flaw (CVSS 6.8) affecting bottle, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.8% (top 22%)
CISA exploited list	No
Weakness	CWE-444
Published	2021-01-18
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: bottlepy · debian

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-01-18 12:15 UTCPublished CVE record published
2026-06-17 03:10 UTCUpdated Record last modified

bottlepy bottle UPGRADE

Affected: < 0.12.19

Fixed in: 0.12.19

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy bottle || rpm -q bottle || bottle --version

2. UPGRADE to 0.12.19 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade bottle

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bottle

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

debian debian linux MITIGATE

Affected: 9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-28473?

bottle: upgrade to 0.12.19; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-28473 being exploited?

CVE-2020-28473 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-28473 affect?

CVE-2020-28473 affects bottle, debian linux. Severity is medium (CVSS 6.8). 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 interp

How urgent is CVE-2020-28473?

Priority 53/100. Public exploit reference; On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

CVE-2022-31799 CRITICAL 9.8 UPGRADE MITIGATE Bottle before 0.12.20 mishandles errors during early request binding.

References

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