CVE-2019-9704

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-03-12 · updated 2026-06-17
Weakness: CWE-252

Description

Vixie Cron before the 3.0pl1-133 Debian package allows local users to cause a denial of service (daemon crash) via a large crontab file because the calloc return value is not checked.

Affected products

Cron Project Cron: before 3.0pl1-133 — fixed in 3.0pl1-133
Debian Linux: 8.0, 9.0
Fedoraproject Fedora: 29

How to fix

Upgrade to a fixed version: Cron Project Cron 3.0pl1-133. Check the vendor advisory for mitigations.

References

http://www.securityfocus.com/bid/107373
https://lists.debian.org/debian-lts-announce/2019/03/msg00025.html
https://lists.debian.org/debian-lts-announce/2021/10/msg00029.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6DU7HAUAQR4E4AEBPYLUV6FZ4PHKH6A2/
https://salsa.debian.org/debian/cron/commit/f2525567
http://www.securityfocus.com/bid/107373
https://lists.debian.org/debian-lts-announce/2019/03/msg00025.html
https://lists.debian.org/debian-lts-announce/2021/10/msg00029.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6DU7HAUAQR4E4AEBPYLUV6FZ4PHKH6A2/
https://salsa.debian.org/debian/cron/commit/f2525567

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