CVE-2000-1138: n/a vulnerability

CVE-2000-1138: Lotus Notes R5 client R5.0.5 and earlier does not properly warn users when an S/MIME email message has been...

Lotus Notes R5 client R5.0.5 and earlier does not properly warn users when an S/MIME email message has been modified, which could allow an attacker to modify the email in transit without being detected.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 8, 2024, 05:45 UTC (UTC+00:00)

Security readout for executives and security teams

Older Lotus Notes R5 email clients (version 5.0.5 and earlier) did not clearly warn users when a digitally signed or encrypted S/MIME email had been tampered with in transit. An attacker able to intercept mail could alter message contents, and the recipient might trust the message as authentic without seeing an alert. Extremely limited in 2026. Lotus Notes R5 (released around 1999) is long past end-of-support and rarely deployed. Exposure is realistic only in legacy archival environments still running unpatched R5 clients that rely on S/MIME. Very low priority. This is a 2000-era defect in an unsupported email client. Address only if legacy Lotus Notes R5 remains in use; otherwise treat as historical and confirm no R5 systems are still active. Mitigation focus: Retire Lotus Notes R5 clients; migrate to a supported, maintained mail client.; Consult IBM/HCL Notes vendor guidance for any residual R5 deployments.; Enforce TLS on mail transport to reduce in-transit interception risk..

Prepared: Jul 12, 2026, 00:03 UTC (UTC+00:00)

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

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Dec 19, 2000, 05:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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CVE List V5 sourceCVE List V5

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