CVE-2024-12243 | Gnutls: gnutls impacted by inefficient der decoding in libtasn1 leading to remote dos

A flaw was found in GnuTLS, which relies on libtasn1 for ASN.1 data processing. Due to an inefficient algorithm in libtasn1, decoding certain DER-encoded certificate data can take excessive time, leading to increased resource consumption. This flaw allows a remote attacker to send a specially crafted certificate, causing GnuTLS to become unresponsive or slow, resulting in a denial-of-service condition.

Published: 2025-02-10 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Deferred，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-12243 is rated Moderate Risk (49/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.23%). Review affected assets and schedule 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-2024-12243

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 2026-06-02 1.26% 1.23% -0.03%
2 2026-05-22 1.23% 1.26% +0.03%
3 2026-05-12 — 1.23% —

Full EPSS history (27 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-12243

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L 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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 3.9 1.4 [email protected]

Weakness enumeration for CVE-2024-12243

GitHub Security Advisory for CVE-2024-12243

GHSA-cqj4-fp95-jqxq · Severity: medium — A flaw was found in GnuTLS, which relies on libtasn1 for ASN.1 data processing. Due to an...

OS Trackers for CVE-2024-12243

vendor priority summary link
alpine — CVE-2024-12243: 1 source package rows (gnutls); 5 state rows across 5 repos (3.20-main, 3.21-main, 3.22-main, 3.23-main, edge-main); fixed 5, open 0. https://security.alpinelinux.org/vuln/CVE-2024-12243
debian not yet assigned CVE-2024-12243 not yet assigned priority: Debian including 1 source packages (gnutls28), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2024-12243
gentoo high CVE-2024-12243: 1 GLSA(s) (202509-08), 1 atom(s) (net-libs/gnutls); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2024-12243
redhat medium — https://access.redhat.com/security/cve/CVE-2024-12243
suse medium CVE-2024-12243 severity moderate: SUSE including 307 source package names (0.23.1-12.3:libgnutls30-3.8.3-150600.4.6.2, 0.3.2-1.2:libgnutls30-3.8.3-150600.4.6.2, …), 699 product×package rows across 331 product lines (Container bci/kiwi, Container bci/php, … (331 product lines)): Fixed 478, Known Affected 221. https://www.suse.com/security/cve/CVE-2024-12243/
ubuntu medium CVE-2024-12243 medium priority: Ubuntu including 1 source packages (gnutls28), 9 status rows across 9 suites (bionic, focal, jammy, noble, oracular, plucky, questing, upstream, xenial): released 7, needs-triage 2. https://ubuntu.com/security/CVE-2024-12243

Affected software / configurations for CVE-2024-12243

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2024-12243

cvelogic Threat Intelligence