What is CVE-2017-15722?

CVE-2017-15722 is a medium-severity vulnerability in Irssi, classified under Out-of-bounds Read. CVSS score: 5.9/10. Published 2017-10-22.

How severe is CVE-2017-15722?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Out-of-bounds Read in Irssi

CVE-2017-15722

In certain cases, Irssi before 1.0.5 may fail to verify that a Safe channel ID is long enough, causing reads beyond the end of the string.

Vulnerability class: Buffer Overflow

Published 2017-10-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.020 (79.9th percentile), scored 2026-10-07.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000

Affected products

Irssi
Debian Linux — versions 7.0, 8.0, 9.0

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

www.debian.org/security/2017/dsa-4016 (vendor-advisory, Third Party Advisory)
lists.debian.org/debian-lts-announce/2017/12/msg00022.html (mailing-list, Mailing List, Third Party Advisory)
irssi.org/security/irssi_sa_2017_10.txt (Patch, Mitigation, Vendor Advisory)
openwall.com/lists/oss-security/2017/10/22/4 (Patch, Mailing List, Third Party Advisory, Mitigation)

Frequently asked questions

What is CVE-2017-15722?: CVE-2017-15722 is a medium-severity vulnerability in Irssi, classified under Out-of-bounds Read. CVSS score: 5.9/10. Published 2017-10-22.
How severe is CVE-2017-15722?: Medium severity. CVSS v3 base score is 5.9 out of 10.