CVE-2017-5193 Null dereference in n/a

What is CVE-2017-5193?

CVE-2017-5193 is a high-severity vulnerability in Debian Debian Linux, published on 3 Mar 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-476

Which versions are affected by CVE-2017-5193?

It affects 2 products.

Products include Debian Debian Linux, Irssi Irssi.

How do I fix CVE-2017-5193?

Upgrade to a fixed version.

Is CVE-2017-5193 being exploited?

There is no known exploitation of CVE-2017-5193 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

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• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2017-5193, DEBIAN-CVE-2017-5193, GHSA-g4fg-wxpr-x2cj, UBUNTU-CVE-2017-5193.