CVE-1999-0098

CRITICAL

Buffer overflow in SMTP HELO command in Sendmail allows a remote attacker to hide activities.

Affects 3 products across 3 vendors.

BCS7.53
CVSS 2.010.0
EPSS3.1%
Percentile87th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity.
◆ SAGE Intelligence — CITED Relevance Research Team

This vulnerability was disclosed in 1998. A critical vulnerability affects Apple systems (CVE-1999-0098). No public exploit code is currently available. Isolate affected systems if patching is not feasible.

BSID: BS-1998-GLOBAL-350616-C • Model: rule-based-v1 • Confidence: MEDIUM

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Frequently Asked Questions
What is CVE-1999-0098?
This vulnerability was disclosed in 1998. A critical vulnerability affects Apple systems (CVE-1999-0098). No public exploit code is currently available. Isolate affected systems if patching is not feasible.
What is the CVSS score for CVE-1999-0098?
CVE-1999-0098 has CVSS 10.0 (Critical). Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C. EPSS: 3.1%.
Is CVE-1999-0098 actively exploited?
No confirmed active exploitation of CVE-1999-0098 as of 2026-06-20.
How do I remediate CVE-1999-0098?
Priority: MEDIUM.
What systems are affected by CVE-1999-0098?
CVE-1999-0098 affects: Apple, Pmail, Seattlelab.
Vulnerability Details
CVE IDCVE-1999-0098
BSIDBS-1998-GLOBAL-350616-C BreachSpider Global ID
CVSS VectorAV:N/AC:L/Au:N/C:C/I:C/A:C
Published1998-04-01
Last Modified2026-06-16
ICS Relevance0%
SourceNVD
Official Description

Buffer overflow in SMTP HELO command in Sendmail allows a remote attacker to hide activities.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

Vulnerability details: Buffer overflow in SMTP HELO command in Sendmail allows a remote attacker to hide activities. CVSS vector: AV:N/AC:L/Au:N/C:C/I:C/A:C.

Exploitation Likelihood: LOW

Affected Products
VendorProductFixed Version
Apple Appleshare —
Pmail Mercury Mail Server —
Seattlelab Slmail —
Remediation

No patch URL on record. Monitor vendor security advisories directly.

Threat Intelligence
● Threat Intelligence Validated: August 2026 | Threat Age: 10350 Days
CISA KEVNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
SAGE Enrichment Record — provenance & audit hash
Modelrule-based-v1
ConfidenceMEDIUM
Enriched At2026-05-24
SHA-512 Audit Hash35c57fc002c0f65ff3820ca2cc3fdc1547036304674b56f4712234fadf4fa280483b9dd93a969d50fc7d72bfc088923ded8b9b7519cb5712196bba0b82fd0596
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