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Maven

CVE-2019-10754

HIGH

Use of Insufficiently Random Values in Apereo CAS

Also known asGHSA-g24w-373r-5pxg
Published
Sep 23, 2019
Updated
Apr 10, 2026
Affected
6 pkgs
Patched
6 / 6
Exploits
5 known

EPSS Exploitation Probability

via FIRST.org ↗
1.8%probability of exploitation in next 30 days
Lower Risk75th percentile+1.35%
0.00%0.75%1.50%2.25%0.4%1.8%Dec 25Apr 26Jun 26

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Blast Radius

6 pkgs affected
org.apereo.cas:cas-server-support-simple-mfaorg.apereo.cas:cas-server-support-oidcorg.apereo.cas:cas-server-core-services-apiorg.apereo.cas:cas-server-support-oauth-core-apiorg.apereo.cas:cas-server-support-shellorg.apereo.cas:cas-server-core-services-authentication

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Multiple classes used within Apereo CAS before release 6.1.0-RC5 makes use of apache commons-lang3 RandomStringUtils for token and ID generation which makes them predictable due to RandomStringUtils PRNG's algorithm not being cryptographically strong.

Affected Packages

6 total 6 fixed
EcosystemPackageVulnerable rangeFix
Mavenorg.apereo.cas:cas-server-support-simple-mfaall versions6.1.0-RC5
Mavenorg.apereo.cas:cas-server-support-oidcall versions6.1.0-RC5
Mavenorg.apereo.cas:cas-server-core-services-apiall versions6.1.0-RC5
Mavenorg.apereo.cas:cas-server-support-oauth-core-apiall versions6.1.0-RC5
Mavenorg.apereo.cas:cas-server-support-shellall versions6.1.0-RC5
Mavenorg.apereo.cas:cas-server-core-services-authenticationall versions6.1.0-RC5
Exploits & PoCs
5

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apereo.cas:cas-server-support-simple-mfa. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Fix

    Update org.apereo.cas:cas-server-support-simple-mfa to 6.1.0-RC5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-10754 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 pinpoints whether CVE-2019-10754 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to CVE-2019-10754. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

Multiple classes used within Apereo CAS before release 6.1.0-RC5 makes use of apache commons-lang3 RandomStringUtils for token and ID generation which makes them predictable due to RandomStringUtils PRNG's algorithm not being cryptographically strong.
O3 Security · Impact-Aware SCA

Is CVE-2019-10754 in your dependencies?

O3 detects CVE-2019-10754 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.