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CVE-2021-29480

15
FAUCET Score

CVE-2021-29480 affects Ratpack web applications prior to version 1.9.0, where the client-side session module defaults to using the application startup time as the signing key. This low-severity vulnerability (CVSS 3.1) allows an attacker to tamper with session data if they can determine the startup time and encryption is not enabled, leading to a potential integrity compromise. While the attack complexity is high due to the need to determine startup time, the impact is limited to data integrity. There is no evidence of active exploitation, public exploit code, 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

4.4MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
1.8
Impact Score
2.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.26%
Probability of exploitation in next 30 days
EPSS Percentile
17.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0026 is in the 7th percentile among its peer group of 1,637 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (1)

mavenpatch availablevia ghsa
Product: io.ratpack:ratpack-sessionFixed in: 1.9.0

Vendor Advisories (1)

mavenGHSA-2cc5-23r7-vc4vmedium

Ratpack's default client side session signing key is highly predictable

Jul 1, 2021

References

github.com / ratpack/ratpack/blob/29434f7ac6fd4b36a4495429b70f4c8163100332/ratpack-session/src/main/java/ratpack/session/clientside/ClientSideSessionConfig.java
Third Party Advisory
github.com / ratpack/ratpack/security/advisories/GHSA-2cc5-23r7-vc4v
Third Party Advisory