What’s Vulnerable › Vulnerabilities

CVE-2017-5356

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2017-03-03 · updated 2026-06-17
• Weakness: CWE-125

Description

Irssi before 0.8.21 allows remote attackers to cause a denial of service (out-of-bounds read and crash) via a string containing a formatting sequence (%[) without a closing bracket (]).

Affected products

• Debian Linux: 7.0
• Irssi: before 0.8.21 — fixed in 0.8.21

How to fix

Upgrade to a fixed version: Irssi 0.8.21. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2017/01/12/8
• http://www.openwall.com/lists/oss-security/2017/01/13/2
• http://www.securityfocus.com/bid/96581
• https://blog.fuzzing-project.org/55-Fuzzing-Irssi-with-Perl-Scripts.html
• https://irssi.org/security/irssi_sa_2017_01.txt
• https://lists.debian.org/debian-lts-announce/2017/12/msg00022.html
• http://www.openwall.com/lists/oss-security/2017/01/12/8
• http://www.openwall.com/lists/oss-security/2017/01/13/2
• http://www.securityfocus.com/bid/96581
• https://blog.fuzzing-project.org/55-Fuzzing-Irssi-with-Perl-Scripts.html
• https://irssi.org/security/irssi_sa_2017_01.txt
• https://lists.debian.org/debian-lts-announce/2017/12/msg00022.html

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