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CVE-2017-5356

27
FAUCET Score

CVE-2017-5356 describes an out-of-bounds read vulnerability in Irssi versions prior to 0.8.21, affecting Debian Linux and Irssi itself. An unauthenticated remote attacker can trigger a denial of service by sending a malformed string containing an incomplete formatting sequence. With a CVSS score of 7.5 (HIGH), this vulnerability is easily exploitable over the network with no user interaction, leading to a complete loss of availability. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.8.21CPE matchmatch criteria
cpe:2.3:a:irssi:irssi:*:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.78%
Probability of exploitation in next 30 days
EPSS Percentile
91.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0478 is in the 84th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (2)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: irssi
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: irssi

Vendor Advisories (1)

redhatCVE-2017-5356Low

irssi: Out-of-bounds read in format string

Jan 12, 2017

References

blog.fuzzing-project.org / 55-Fuzzing-Irssi-with-Perl-Scripts.html
ExploitTechnical DescriptionThird Party Advisory
irssi.org / security/irssi_sa_2017_01.txt
PatchVendor Advisory
lists.debian.org / debian-lts-announce/2017/12/msg00022.html
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2017/01/12/8
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2017/01/13/2
Mailing ListThird Party Advisory
securityfocus.com / bid/96581
Third Party AdvisoryVDB Entry