CVE-2023-46849

Using the --fragment option in certain configuration setups OpenVPN version 2.6.0 to 2.6.6 allows an attacker to trigger a divide by zero behaviour which could cause an application crash, leading to a denial of service.

Published: 2023-11-11 Last update: 2025-06-11 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-46849 is rated Moderate Risk (52.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.14%). 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-2023-46849

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 2026-06-15 0.48% 1.14% +0.66%
2 2025-11-21 1.61% 0.48% -1.13%
3 2025-11-18 — 1.61% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-46849

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2023-46849

OS Trackers for CVE-2023-46849

vendor priority summary link
alpine — CVE-2023-46849: 1 source package rows (openvpn); 14 state rows across 6 repos (3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 6, open 8. https://security.alpinelinux.org/vuln/CVE-2023-46849
debian unimportant CVE-2023-46849 unimportant priority: Debian including 1 source packages (openvpn), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2023-46849
gentoo normal CVE-2023-46849: 1 GLSA(s) (202409-08), 1 atom(s) (net-vpn/openvpn); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2023-46849
suse medium CVE-2023-46849 severity moderate: SUSE including 25 source package names (NetworkManager-applet-openvpn, NetworkManager-openvpn, …), 144 product×package rows across 49 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 7.1, … (49 product lines)): Known Not Affected 128, Fixed 16. https://www.suse.com/security/cve/CVE-2023-46849/
ubuntu medium CVE-2023-46849 medium priority: Ubuntu including 1 source packages (openvpn), 8 status rows across 8 suites (bionic, focal, jammy, lunar, mantic, trusty, upstream, xenial): not-affected 5, released 3. https://ubuntu.com/security/CVE-2023-46849

Affected software / configurations for CVE-2023-46849

Vendor Product Version Raw CPE
openvpn openvpn >= 2.6.0, <= 2.6.6 cpe:2.3:a:openvpn:openvpn:*:*:*:*:community:*:*:*
openvpn openvpn_access_server >= 2.11.0, <= 2.11.3 cpe:2.3:a:openvpn:openvpn_access_server:*:*:*:*:*:*:*:*
openvpn openvpn_access_server 2.12.0 cpe:2.3:a:openvpn:openvpn_access_server:2.12.0:*:*:*:*:*:*:*
openvpn openvpn_access_server 2.12.1 cpe:2.3:a:openvpn:openvpn_access_server:2.12.1:*:*:*:*:*:*:*
debian debian_linux 12.0 cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:*
fedoraproject fedora 39 cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*

References for CVE-2023-46849

cvelogic Threat Intelligence