CVE-1999-1109: n/a vulnerability

CVE-1999-1109: Sendmail before 8.10.0 allows remote attackers to cause a denial of service by sending a series of ETRN com...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 1, 2024, 17:02 UTC (UTC+00:00)

Security readout for executives and security teams

A flaw in older versions of Sendmail, a widely used mail server, let remote attackers slow or crash the service by sending repeated ETRN commands and then hanging up. Sendmail kept processing the commands after the connection ended, wasting server resources. Only versions before 8.10.0 are affected, and the issue is over two decades old. Exposure today is minimal. Sendmail 8.10.0 was released in 2000, and any actively maintained mail infrastructure is on a far newer release. Risk is limited to legacy or unmanaged systems still running pre-8.10.0 Sendmail that expose SMTP to untrusted networks. No affected CPEs are enumerated in the source bundle. Very low priority for modern environments. Treat as a legacy hygiene check: confirm no obsolete Sendmail instances remain in production. No customer-visible or regulatory urgency is implied by the cited sources. Mitigation focus: Upgrade Sendmail to a currently supported release well beyond 8.10.0.; Restrict SMTP ETRN usage to authenticated or allow-listed relay partners.; Place mail servers behind rate-limiting and connection-limiting controls..

Prepared: Jul 11, 2026, 12:52 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Mar 9, 2002, 05:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors

0Timeline events

0ADP providers

1Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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