Security readout for executives and security teams
XCmail 0.99.6 can be compromised when autoquote is enabled and it processes an email with an overly long subject line. The public description says this may allow arbitrary command execution. This is an old issue, but any remaining legacy use should be treated seriously. Exposure is likely limited to legacy systems or users still running XCmail 0.99.6 with autoquote enabled. Modern environments are unlikely to be affected unless old mail clients remain in use. Prioritize remediation if XCmail 0.99.6 exists anywhere in the environment. The business risk is narrow but severe: remote command execution on legacy endpoints processing malicious email content. Mitigation focus: Identify and remove any XCmail 0.99.6 installations.; Disable autoquote where XCmail cannot be immediately retired.; Check archived vendor or trusted vulnerability guidance for any official fix..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CVE-1999-1553 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
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
- xcmail-reply-overflow(1859)CVE reference · vdb-entry, x_refsource_XF
Products and packages named in the record
CWE details
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