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CVE-2017-5193

21
FAUCET Score

CVE-2017-5193 describes a denial-of-service vulnerability in Irssi versions prior to 0.8.21, affecting Debian Linux and Irssi itself. A remote attacker can trigger a NULL pointer dereference and crash the application by sending a message without a nick. This vulnerability has a CVSS v3 score of 7.5 (High), indicating it can be exploited remotely with low attack complexity, leading to high availability impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage 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
5.59%
Probability of exploitation in next 30 days
EPSS Percentile
92.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0559 is in the 86th percentile among its peer group of 51,551 CVEs.

Social Chatter

No social media mentions found for this CVE.

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-2017-5193Low

irssi: Null pointer dereference in the nickcmp function

Jan 5, 2017

References

irssi.org / security/irssi_sa_2017_01.txt
PatchVendor Advisory
lists.debian.org / debian-lts-announce/2017/12/msg00022.html
Third Party Advisory
security.gentoo.org / glsa/201701-45
Third Party Advisory
openwall.com / lists/oss-security/2017/01/06/1
Mailing ListThird Party Advisory
securityfocus.com / bid/95310
Third Party AdvisoryVDB Entry