Description
The ClamAV Mail fILTER (clamav-milter) 0.84 through 0.85d, when used in Sendmail using long timeouts, allows remote attackers to cause a denial of service by keeping an open connection, which prevents ClamAV from reloading.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗Advisories 2
- DSA-737-1 clamav - various DOS vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
- DTSA-3-1 clamav - denial of service and privilege escalation Debian Security (DSA / DLA) · Mar 9, 2026
References
- SUSE-SA:2005:038 vendor-advisory
- 20050623 long sendmail timeouts let attacker prevent milter quiesce mailing-list
- DSA-737 vendor-advisory
- 14047 vdb-entry