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CVE-2017-15723

23
FAUCET Score

CVE-2017-15723 is a NULL pointer dereference vulnerability affecting Irssi versions prior to 1.0.5, specifically impacting Debian Linux distributions. This flaw can be triggered by processing overlong nicks or targets within a message. With a CVSSv3 score of 7.5 (High), it poses a significant availability risk (A:H) due to its low attack complexity (AC:L) and network-based attack vector (AV:N), requiring no user interaction (UI:N). There is currently no evidence of active exploitation, nor are there publicly available exploit modules or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.0.4CPE matchmatch criteria
cpe:2.3:a:irssi:irssi:*:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

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
2.30%
Probability of exploitation in next 30 days
EPSS Percentile
81.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0230 is in the 67th percentile among its peer group of 51,551 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 Advisories (1)

redhatCVE-2017-15723Moderate

irssi: NULL pointer dereference due to overlong nicks while splitting the message

Oct 22, 2017

References

openwall.com / lists/oss-security/2017/10/22/4
Mailing ListMitigationPatchThird Party Advisory
irssi.org / security/irssi_sa_2017_10.txt
MitigationPatchVendor Advisory
debian.org / security/2017/dsa-4016
Third Party Advisory