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Fencer Intel
low 3.7

CVE-2019-11808 json

Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) in Ratpack

published 7y ago modified 4mo ago also GHSA-54mg-vgrp-mwx9 , EUVD-2019-0451

cvss
3.7
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

Ratpack versions before 1.6.1 generate a session ID using a cryptographically weak PRNG in the JDK's ThreadLocalRandom. This means that if an attacker can determine a small window for the server start time and obtain a session ID value, they can theoretically determine the sequence of session IDs.

Patch / fix

  • maven io.ratpack:ratpack-session 1.6.1
  • maven io.ratpack:ratpack-java 1.6.1
  • maven io.ratpack:ratpack-groovy 1.6.1
  • ratpack_project ratpack 1.6.1

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Exploit prediction

1.32% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 3.7 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N
GitHub 3.0 3.7 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
maven io.ratpack:ratpack-session
<1.6.1
1.6.1
maven io.ratpack:ratpack-java
<1.6.1
1.6.1
maven io.ratpack:ratpack-groovy
<1.6.1
1.6.1

Classification

Weakness
  • CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.