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Vulnerability record · CVE-2017-5193 · published 3 March 2017

CVE-2017-5193: Irssi null pointer dereference vulnerability

Irssi · Irssi

The nickcmp function in Irssi before 0.8.21 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via a message without a nick.

7.5 CVSS 3.0 High EPSS 5.6% · top 7.4% CWE-476 · NULL pointer dereference
7.5CVSS 3.0 base score, v2 5.0
5.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

The nickcmp function in Irssi before 0.8.21 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via a message without a nick.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

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

References

LinkTags
http://www.openwall.com/lists/oss-security/2017/01/06/1 Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/95310 Third Party AdvisoryVDB Entry
https://irssi.org/security/irssi_sa_2017_01.txt PatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2017/12/msg00022.html Third Party Advisory
https://security.gentoo.org/glsa/201701-45 Third Party Advisory
http://www.openwall.com/lists/oss-security/2017/01/06/1 Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/95310 Third Party AdvisoryVDB Entry
https://irssi.org/security/irssi_sa_2017_01.txt PatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2017/12/msg00022.html Third Party Advisory
https://security.gentoo.org/glsa/201701-45 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2017-5193), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.