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Fencer Intel
high 7.5

CVE-2017-5356 json

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 formattin…

published 2017-03-03 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-14460

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.8%
EPSS 4.8% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

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 (]).

Patch / fix

  • irssi irssi 0.8.21
  • irssi Debian 14, Debian 13, Debian 12 0.8.21-1

debian advisories DEBIAN-CVE-2017-5356

  • irssi Ubuntu 14.04 LTS 0.8.15-5ubuntu3.1
  • irssi Ubuntu 16.04 LTS 0.8.19-1ubuntu1.3

ubuntu advisories UBUNTU-CVE-2017-5356

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • irssi openSUSE Tumbleweed 1.2.3-2.4

opensuse advisories openSUSE-SU-2024:10865-1

  • irssi Alpine 3.5, Alpine 3.4, Alpine 3.3 +1 more 0.8.21-r0

alpine advisories ALPINE-CVE-2017-5356

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-5356 updated cvss 5.9

irssi: Out-of-bounds read in format string

  • Red Hat Enterprise Linux 6 irssi Red Hat Enterprise Linux 7 irssi
    affected: no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.78% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • blog.fuzzing-project.org https://blog.fuzzing-project.org/55-Fuzzing-Irssi-with-Perl-Scripts.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.