CVE-2024-39844

In ZNC before 1.9.1, remote code execution can occur in modtcl via a KICK.

Published: 2024-07-03 Last update: 2026-04-15 Assigner: [email protected] Source: [email protected]
NVD Status：Deferred，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-39844 is rated High Risk (71.5/100): CVSS Critical severity, with high exploitation likelihood (EPSS 37.14%, 97th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2024-39844

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-26 38.88% 37.14% -1.74%
2 2025-11-22 32.57% 38.88% +6.30%
3 2025-11-21 — 32.57% —

Full EPSS history (22 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-39844

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2024-39844

OS Trackers for CVE-2024-39844

vendor priority summary link
alpine critical CVE-2024-39844: 1 source package rows (znc); 4 state rows across 4 repos (3.20-community, 3.21-community, 3.22-community, edge-community); fixed 4, open 0. https://security.alpinelinux.org/vuln/CVE-2024-39844
debian not yet assigned CVE-2024-39844 not yet assigned priority: Debian including 1 source packages (znc), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2024-39844
gentoo normal CVE-2024-39844: 1 GLSA(s) (202409-23), 1 atom(s) (net-irc/znc); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2024-39844
ubuntu medium CVE-2024-39844 medium priority: Ubuntu including 1 source packages (znc), 11 status rows across 11 suites (bionic, focal, jammy, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): released 7, not-affected 3, ignored 1. https://ubuntu.com/security/CVE-2024-39844

Affected software / configurations for CVE-2024-39844

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2024-39844

cvelogic Threat Intelligence