VulnerabilityDeferred

CVE-2024-23184

An external attacker can send specially crafted messages that consume target system resources and cause outage.

MEDIUM 5.0EPSS 0.84%

Does this matter?

Lower severity and a low EPSS score (0.84%). Track it; it rarely justifies an emergency change on its own.

Description

Having a large number of address headers (From, To, Cc, Bcc, etc.) becomes excessively CPU intensive. With 100k header lines CPU usage is already 12 seconds, and in a production environment we observed 500k header lines taking 18 minutes to parse. Since this can be triggered by external actors sending emails to a victim, this is a security issue. An external attacker can send specially crafted messages that consume target system resources and cause outage. One can implement restrictions on address headers on MTA component preceding Dovecot. No publicly available exploits are known.

CVSS 3.1: 5.0 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
EPSS: 0.84% probability · 56th percentile
CISA KEV: Not listed
Weakness: CWE-770
Source: security@open-xchange.com

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.