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CVE-2021-29376

25
FAUCET Score

CVE-2021-29376 describes a denial-of-service vulnerability in ircII versions prior to 20210314, affecting Debian and Eterna distributions. An unauthenticated remote attacker can crash a vulnerable client and disconnect them from an IRC server by sending a specially crafted CTCP UTC message. With a CVSS score of 7.5 (High), this vulnerability is easily exploitable over the network with low attack complexity, leading to high availability impact. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 20210314CPE matchmatch criteria
cpe:2.3:a:eterna:ircii:*:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/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
3.1

Exploit Intelligence

EPSS Score
2.33%
Probability of exploitation in next 30 days
EPSS Percentile
81.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0232 is in the 67th 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

Remediation records are not available for this CVE.

References

lists.debian.org / debian-lts-announce/2021/08/msg00022.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2021/08/msg00023.html
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2021/03/24/2
Mailing ListThird Party Advisory
eterna.com.au / ircii
ProductVendor Advisory
openwall.com / lists/oss-security/2021/03/30/4
Mailing ListThird Party Advisory