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CVE-2021-29479 Ratpack

Affected softwareRatpack
Severity7.0 High CVSS 3.1 3 scores
Fixed in1.9.0
WeaknessCWE-807
Published29 Jun 2021
Updated17 Jun 2026

Description

Ratpack is a toolkit for creating web applications. In versions prior to 1.9.0, a user supplied X-Forwarded-Host header can be used to perform cache poisoning of a cache fronting a Ratpack server if the cache key does not include the X-Forwarded-Host header as a cache key. Users are only vulnerable if they do not configure a custom PublicAddress instance. For versions prior to 1.9.0, by default, Ratpack utilizes an inferring version of PublicAddress which is vulnerable. This can be used to perform redirect cache poisoning where an attacker can force a cached redirect to redirect to their site instead of the intended redirect location. The vulnerability was patched in Ratpack 1.9.0. As a workaround, ensure that ServerConfigBuilder::publicAddress correctly configures the server in production.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. Published 5 years ago.
  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment no assessment published
  • Indexed PoC none indexed
  • EPSS 0.86% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.
Candidate fix https://github.com/ratpack/ratpack/security/advisories/GHSA-w6rq-6h34-vh7q : the maintainers' own security advisory: names the version that fixes it, so the fix is the difference between two releases

CVSS

7.0 HIGH v3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L 3 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 7.0 HIGH CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L security-advisories@github.com Secondary published
CVSS 3.1 6.1 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N NVD Primary
CVSS 2.0 4.0 none AV:N/AC:H/Au:N/C:P/I:P/A:N NVD Primary

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
io.ratpack:ratpack-core 0 1.9.0 unbounded

Products and versions

2 products, 2 version entries
SourceVendorProductSchemeAffected versions
osv io.ratpack ratpack-core generic ＜ 1.9.0
nvd ratpack project ratpack generic ＜ 1.9.0

References

URLTags
https://github.com/ratpack/ratpack/security/advisories/GHSA-w6rq-6h34-vh7q advisory
https://github.com/ratpack/ratpack PACKAGE
https://portswigger.net/web-security/web-cache-poisoning WEB

Timeline
Published2021-06-29By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.