CVE-2025-13086

Improper validation of source IP addresses in OpenVPN version 2.6.0 through 2.6.15 and 2.7_alpha1 through 2.7_rc1 allows an attacker to open a session from a different IP address which did not initiate the connection resulting in a denial of service for the originating client

Published: 2025-12-03 Last update: 2026-01-30 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-13086 is rated Low Risk (24.1/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.05%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

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-2025-13086

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 2026-05-13 0.05% 0.05% +0.01%
2 2026-04-15 0.05% 0.05% -0.01%
3 2025-12-09 — 0.05% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-13086

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.6 4.0 MEDIUM
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network.
Attack complexity (AC:H)
Exploitation depends on constrained or hard-to-reproduce conditions.
Attack requirements (AT:P)
Additional preconditions must be present for exploitation.
Privileges required (PR:N)
No privileges are required.
User interaction (UI:N)
No user interaction is required.
Vulnerable system confidentiality impact (VC:N)
No confidentiality impact on the vulnerable system.
Vulnerable system integrity impact (VI:N)
No integrity impact on the vulnerable system.
Vulnerable system availability impact (VA:H)
High availability impact on the vulnerable system.
Subsequent system confidentiality impact (SC:N)
No confidentiality impact on subsequent systems.
Subsequent system integrity impact (SI:N)
No integrity impact on subsequent systems.
Subsequent system availability impact (SA:N)
No availability impact on subsequent systems.
Exploit maturity (threat) (E:U)
Unreported: no public PoC, no reported exploitation, and no known simplification tools.
Confidentiality requirement (CR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Integrity requirement (IR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Availability requirement (AR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Modified attack vector (MAV:X)
Not defined: scoring uses the Base Attack Vector (AV).
Modified attack complexity (MAC:X)
Not defined: scoring uses the Base Attack Complexity (AC).
Modified attack requirements (MAT:X)
Not defined: scoring uses the Base Attack Requirements (AT).
Modified privileges required (MPR:X)
Not defined: scoring uses the Base Privileges Required (PR).
Modified user interaction (MUI:X)
Not defined: scoring uses the Base User Interaction (UI).
Modified vulnerable system confidentiality impact (MVC:X)
Not defined: scoring uses the Base VC metric.
Modified vulnerable system integrity impact (MVI:X)
Not defined: scoring uses the Base VI metric.
Modified vulnerable system availability impact (MVA:X)
Not defined: scoring uses the Base VA metric.
Modified subsequent system confidentiality impact (MSC:X)
Not defined: scoring uses the Base SC metric.
Modified subsequent system integrity impact (MSI:X)
Not defined: scoring uses the Base SI metric.
Modified subsequent system availability impact (MSA:X)
Not defined: scoring uses the Base SA metric.
Safety (supplemental) (S:X)
Not evaluated.
Automatable (supplemental) (AU:X)
Not evaluated.
Recovery (supplemental) (R:X)
Not evaluated.
Value density (supplemental) (V:X)
Not evaluated.
Vulnerability response effort (supplemental) (RE:X)
Not evaluated.
Provider urgency (supplemental) (U:X)
Not evaluated.
 — — [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 [email protected]

Weakness enumeration for CVE-2025-13086

OS Trackers for CVE-2025-13086

vendor priority summary link
alpine — CVE-2025-13086: 1 source package rows (openvpn); 39 state rows across 6 repos (3.19-main, 3.20-main, 3.21-main, 3.22-main, 3.23-main, edge-main); fixed 8, open 31. https://security.alpinelinux.org/vuln/CVE-2025-13086
debian unimportant CVE-2025-13086 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-2025-13086
redhat medium — https://access.redhat.com/security/cve/CVE-2025-13086
suse high CVE-2025-13086 severity important: SUSE including 16 source package names (2.1.3-5.6:libpcp3-6.2.0-1.1, 2.1.3-5.6:libpcp_import1-6.2.0-1.1, …), 99 product×package rows across 32 product lines (Container suse/sl-micro/6.0/baremetal-os-container, SLES-LTSS-TERADATA 15 SP2, … (32 product lines)): Known Not Affected 59, Fixed 36, First Fixed 4. https://www.suse.com/security/cve/CVE-2025-13086/
ubuntu medium CVE-2025-13086 medium priority: Ubuntu including 1 source packages (openvpn), 9 status rows across 9 suites (bionic, focal, jammy, noble, plucky, questing, trusty, upstream, xenial): not-affected 5, released 4. https://ubuntu.com/security/CVE-2025-13086

Affected software / configurations for CVE-2025-13086

Vendor Product Version Raw CPE
openvpn openvpn >= 2.6.0, < 2.6.16 cpe:2.3:a:openvpn:openvpn:*:*:*:*:community:*:*:*
openvpn openvpn 2.7 cpe:2.3:a:openvpn:openvpn:2.7:alpha1:*:*:community:*:*:*
openvpn openvpn 2.7 cpe:2.3:a:openvpn:openvpn:2.7:alpha2:*:*:community:*:*:*
openvpn openvpn 2.7 cpe:2.3:a:openvpn:openvpn:2.7:alpha3:*:*:community:*:*:*
openvpn openvpn 2.7 cpe:2.3:a:openvpn:openvpn:2.7:beta1:*:*:community:*:*:*
openvpn openvpn 2.7 cpe:2.3:a:openvpn:openvpn:2.7:beta2:*:*:community:*:*:*
openvpn openvpn 2.7 cpe:2.3:a:openvpn:openvpn:2.7:beta3:*:*:community:*:*:*
openvpn openvpn 2.7 cpe:2.3:a:openvpn:openvpn:2.7:rc1:*:*:community:*:*:*

References for CVE-2025-13086

cvelogic Threat Intelligence