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Vulnerability record · CVE-2017-13649 · published 23 August 2017

CVE-2017-13649: Unrealircd vulnerability

Unrealircd · Unrealircd

UnrealIRCd 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 processes by leveraging access to this non-root account for PID file modification before a root script executes a "kill `cat /pathname`" command. NOTE: the vendor indicates that there is no common or recommended scenario in which a root script would execute this kill command.

5.5 CVSS 3.0 Medium EPSS 0.28% · top 81.2% CWE-665 · CWE-665
5.5CVSS 3.0 base score, v2 2.1
0.28%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

UnrealIRCd 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 processes by leveraging access to this non-root account for PID file modification before a root script executes a "kill `cat /pathname`" command. NOTE: the vendor indicates that there is no common or recommended scenario in which a root script would execute this kill command.

CVSS:3.0/AV:L/AC:L/PR:L/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
http://www.securityfocus.com/bid/100507 Third Party AdvisoryVDB Entry
https://bugs.unrealircd.org/view.php?id=4990 Issue TrackingThird Party Advisory
http://www.securityfocus.com/bid/100507 Third Party AdvisoryVDB Entry
https://bugs.unrealircd.org/view.php?id=4990 Issue TrackingThird Party Advisory

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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-2023-50784Unrealircd classic buffer overflow vulnerabilityA 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 sendi…EPSS 1.9%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%5.0CVE-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%7.8CVE-2022-0847Linux kernel pipe buffer flaw allows local privilege escalationThe flags member of the new pipe buffer structure was not properly initialized in copy_page_to_iter_pipe and push_pipe, so it could hold stale values…KEVEPSS 93%analysed6.5CVE-2013-1675Mozilla Firefox and Thunderbird uninitialized memory information disclosureFirefox, Firefox ESR, Thunderbird and Thunderbird ESR fail to properly initialize the nsDOMSVGZoomEvent::mPreviousScale and mNewScale data structures…KEVEPSS 6.7%analysed

Source: NIST National Vulnerability Database (record CVE-2017-13649), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.