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CVE-1999-0679

29
FAUCET Score

CVE-1999-0679 describes a critical buffer overflow vulnerability in the hybrid-6 IRC server, specifically affecting hybrid_network hybrid_ircd versions. This flaw allows unauthenticated remote attackers to execute arbitrary commands by exploiting the m_invite invite option. With a CVSS score of 7.5 (HIGH), the vulnerability is easily exploitable over the network with low attack complexity, potentially leading to complete compromise of confidentiality, integrity, and availability. While not listed on the KEV catalog or showing active exploitation, a public exploit (EDB-19459) exists, though there is minimal community discussion or media coverage surrounding this decades-old vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 6.0beta58CPE matchmatch criteria
cpe:2.3:a:hybrid_network:hybrid_ircd:*:*:*:*:*:*:*:*
5.03p7CPE matchmatch criteria
cpe:2.3:a:hybrid_network:hybrid_ircd:5.03p7:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.5HIGH

AV:N/AC:L/Au:N/C:P/I:P/A:P

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.26%
Probability of exploitation in next 30 days
EPSS Percentile
87.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
ExploitDB: EDB-19459 · Aug 13, 1999
This CVE's current EPSS score of 0.0326 is in the 77th percentile among its peer group of 51,506 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

efnet.org / archive/servers/hybrid/ChangeLog
securityfocus.com / bid/581