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Vulnerability record · CVE-2023-50784 · published 16 December 2023

CVE-2023-50784: Unrealircd classic buffer overflow vulnerability

Unrealircd · Unrealircd

A buffer overflow in websockets in UnrealIRCd 6.1.0 through 6.1.3 before 6.1.4 allows an unauthenticated remote attacker to crash the server by sending an oversized packet (if a websocket port is open). Remote code execution might be possible on some uncommon, older platforms.

7.5 CVSS 3.1 High EPSS 1.9% · top 21.1% CWE-120 · Classic buffer overflow
7.5CVSS 3.1 base score
1.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

A buffer overflow in websockets in UnrealIRCd 6.1.0 through 6.1.3 before 6.1.4 allows an unauthenticated remote attacker to crash the server by sending an oversized packet (if a websocket port is open). Remote code execution might be possible on some uncommon, older platforms.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://forums.unrealircd.org/viewtopic.php?t=9340 Release NotesVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BV6TFYPQOKYRGPEAKOWSO6P
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EZT7QU4FCQBHYOYVD7FW5QA
https://www.unrealircd.org/index/news Product
https://forums.unrealircd.org/viewtopic.php?t=9340 Release NotesVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BV6TFYPQOKYRGPEAKOWSO6P
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EZT7QU4FCQBHYOYVD7FW5QA
https://lists.fedoraproject.org/archives/list/[email protected]/message/BV6TFYPQOKYRGPEAKOWSO6PSC
https://lists.fedoraproject.org/archives/list/[email protected]/message/EZT7QU4FCQBHYOYVD7FW5QAWN
https://www.unrealircd.org/index/news Product

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.1CVE-2016-7144Unrealircd improper authentication vulnerabilityThe m_authenticate function in modules/m_sasl.c in UnrealIRCd before 3.2.10.7 and 4.x before 4.0.6 allows remote attackers to spoof certificate finge…EPSS 1.3%7.5CVE-2010-2075UnrealIRCd backdoor in DEBUG3_DOLOG_SYSTEM macro allows remote command executionUnrealIRCd 3.2.8.1 distributed from certain mirror sites between November 2009 and June 2010 contained an externally introduced Trojan Horse modifica…EPSS 84%analysed6.8CVE-2009-4893Unrealircd memory buffer overflow vulnerabilityBuffer overflow in UnrealIRCd 3.2beta11 through 3.2.8, when allow::options::noident is enabled, allows remote attackers to cause a denial of service …EPSS 2.5%5.5CVE-2017-13649Unrealircd vulnerabilityUnrealIRCd 4.0.13 and earlier creates a PID file after dropping privileges to a non-root account, which might allow local users to kill arbitrary pro…EPSS 0.28%5.0CVE-2013-7384Unrealircd vulnerabilityUnrealIRCd 3.2.10 before 3.2.10.2 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via unspecified vectors, …EPSS 2.4%5.0CVE-2013-6413Unrealircd vulnerabilityUse-after-free vulnerability in UnrealIRCd 3.2.10 before 3.2.10.2 allows remote attackers to cause a denial of service (crash) via unspecified vector…EPSS 2.4%5.5CVE-2025-43520Apple OS kernel memory corruption via malicious appA memory corruption flaw (classic buffer overflow) in Apple's kernel was fixed across iOS, iPadOS, macOS, tvOS, visionOS and watchOS. A malicious app…KEVEPSS 0.43%analysed8.8CVE-2025-31277Apple WebKit memory corruption via malicious web contentApple WebKit fails to handle memory correctly when processing crafted web content, leading to memory corruption across Safari, iOS, iPadOS, macOS, tv…KEVEPSS 1.6%analysed

Source: NIST National Vulnerability Database (record CVE-2023-50784), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.