How severe is CVE-1999-0679?

CVE-1999-0679 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-1999-0679 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-0679?

CVE-1999-0679 primarily affects Hybrid Network Hybrid Ircd. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-1999-0679?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-1999-0679 published?

CVE-1999-0679 was published on 1999-08-13 and last updated on 2026-06-16.

CVE-1999-0679

CVE-1999-0679 is a high-severity vulnerability in Hybrid Network Hybrid Ircd with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Hybrid Network Hybrid Ircd
Published: 1999-08-13
Last modified: 2026-06-16

Description

Buffer overflow in hybrid-6 IRC server commonly used on EFnet allows remote attackers to execute commands via m_invite invite option.

Frequently asked questions

What is CVE-1999-0679?: Buffer overflow in hybrid-6 IRC server commonly used on EFnet allows remote attackers to execute commands via m_invite invite option.
How severe is CVE-1999-0679?: CVE-1999-0679 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-1999-0679 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-0679?: CVE-1999-0679 primarily affects Hybrid Network Hybrid Ircd. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-0679?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-1999-0679 published?: CVE-1999-0679 was published on 1999-08-13 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:hybrid_network:hybrid_ircd:*:*:*:*:*:*:*:*
cpe:2.3:a:hybrid_network:hybrid_ircd:5.03p7:*:*:*:*:*:*:*