Vulnerability in Cron-Utils Project
CVE-2020-26238
Cron-utils is a Java library to parse, validate, migrate crons as well as get human readable descriptions for them. In cron-utils before version 9.1.3, a template Injection vulnerability is present. This enables attackers to inject arbitrary Java EL expressions, leading to unauthenticated Remote Code Execution (RCE) vulnerability. Only projects using the @Cron annotation to validate untrusted Cron expressions are affected. This issue was patched in version 9.1.3.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.9 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.042 (90.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 90.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.042 · newest: 0.042 · change: 0.000
Affected products
- Cron-Utils Project
- Jmrozanec Cron-Utils — versions < 9.1.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/jmrozanec/cron-utils/security/advisories/GHSA-pfj3-56hm-jwq5 (Exploit, Third Party Advisory)
- github.com/jmrozanec/cron-utils/issues/461 (Exploit, Third Party Advisory, Issue Tracking)
- github.com/jmrozanec/cron-utils/commit/4cf373f7352f5d95f0bf6512af8af326b31c835e (Patch, Third Party Advisory)
- lists.apache.org/thread.html/r96937fc9c82f3201b59311c067e97bce71123944f93102169… (mailing-list)
- lists.apache.org/thread.html/r5f601d15292e3302ad0ae0e89527029546945b1cd5837af7e… (mailing-list)
- lists.apache.org/thread.html/ra9e81244d323898dde3c979dd7df6996e4037d14a01b6629e… (mailing-list)
- lists.apache.org/thread.html/r855aead591697dc2e85faf66c99036e49f492431940b78d4e… (mailing-list)
- lists.apache.org/thread.html/r9ae9a9fb1c8e2bf95c676e7e4cd06aa04f0a3a8a9ec1a6b78… (mailing-list)
- lists.apache.org/thread.html/r71083c759dc627f198571b3d48b6745fe798b1d53c34f7ef8… (mailing-list)
- lists.apache.org/thread.html/r50e1b5544c37e408ed7e9a958b28237b1cb9660ba2b3dba46… (mailing-list)
Frequently asked questions
- What is CVE-2020-26238?
- CVE-2020-26238 is a high-severity vulnerability in Cron-Utils Project, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.9/10. Published 2020-11-25.
- How severe is CVE-2020-26238?
- High severity. CVSS v3 base score is 7.9 out of 10.
- Is CVE-2020-26238 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.