NULL pointer dereference in Irssi - CVE-2017-15721
Published: October 22, 2017 / Updated: July 28, 2020
Vulnerability identifier: #VU32043
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2017-15721
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error in Irssi before 1.0.5, certain incorrectly formatted DCC CTCP messages could cause a NULL pointer dereference. This is a separate, but similar, issue relative to CVE-2017-9468. A remote attacker can perform a denial of service (DoS) attack.
Affected software
Irssi
Arch Linux
Slackware Linux
irssi (Alpine package)
Arch Linux
Slackware Linux
irssi (Alpine package)
How to mitigate CVE-2017-15721
Update to version 1.0.5.
Irssi - update to 1.0.5
irssi (Alpine package) - addressed in versions 1.0.5-r0, 1.0.6-r0
irssi (Alpine package) - addressed in versions 1.0.5-r0, 1.0.6-r0