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CVE-2021-29481

23
FAUCET Score

CVE-2021-29481 affects Ratpack, a web application toolkit, in versions prior to 1.9.0, where client-side sessions store unencrypted but signed data in cookies. This vulnerability, rated 7.5 HIGH, allows sensitive session data to be read if stored in cookies and subsequently leaked, for instance, via an XSS vulnerability. While the CVSS score indicates high confidentiality impact, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.9.0CPE matchmatch criteria
cpe:2.3:a:ratpack_project:ratpack:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.46%
Probability of exploitation in next 30 days
EPSS Percentile
37.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0046 is in the 16th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
mavenpatch availablevia ghsa
Product: io.ratpack:ratpack-sessionFixed in: 1.9.0

Vendor Advisories (1)

mavenGHSA-phj8-4cq3-794gmedium

Unencrypted storage of client side sessions

Jul 1, 2021

References

github.com / ratpack/ratpack/pull/1590
PatchThird Party Advisory
github.com / ratpack/ratpack/security/advisories/GHSA-phj8-4cq3-794g
Third Party Advisory