CVE-1999-1109

CVE-1999-1109 is a medium-severity vulnerability in Sendmail with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Description

Sendmail before 8.10.0 allows remote attackers to cause a denial of service by sending a series of ETRN commands then disconnecting from the server, while Sendmail continues to process the commands after the connection has been terminated.

Frequently asked questions

What is CVE-1999-1109?
Sendmail before 8.10.0 allows remote attackers to cause a denial of service by sending a series of ETRN commands then disconnecting from the server, while Sendmail continues to process the commands after the connection has been terminated.
How severe is CVE-1999-1109?
CVE-1999-1109 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-1999-1109 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-1109?
CVE-1999-1109 affects Sendmail. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-1999-1109?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-1999-1109 published?
CVE-1999-1109 was published on 1999-12-22 and last updated on 2026-06-16.

References

Affected products (1)

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