CVE-2026-84790: openvpn
CVSS: 7.6v4.0HighAwaiting analysis
AliasesUBUNTU-CVE-2026-84790DEBIAN-CVE-2026-84790
Published 13-10-2026Last modified 18-10-2026
Vulnerability summary
CVE-2026-84790 is a high (CVSS 7.6) vulnerability in openvpn. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 11.4% of scored vulnerabilities.
CVSS score
7.6/10
010
High · v4.0 (CVE.org)EPSS score
0.22%
0%100%
Low · Change unavailableKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 13-10-2026PublishedVulnerability first disclosed.
- 18-10-2026Last modifiedVulnerability information updated.
Description
OpenVPN 2.7_alpha1 through 2.7.7 allows remote authenticated users to impersonate others via a crafted certificate subject field
CVSS metrics
4 scores · 4 sources · 1 versionHigh 7.6Preferred score · CVE.org (CNA)
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:NSourcesAll 4 agree
- NVDNIST7.6HighCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/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
- OSV · DebianEcosystem advisory · calculated7.6HighCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/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
- OSV · UbuntuEcosystem advisory · calculated7.6HighCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
EPSS trend
Probability
0.22%
Chance of exploitation in the next 30 days
Percentile
11%
Versus all other CVEs
30-day change
Change unavailable
Change unavailable
14-10-202621-10-2026
EPSS score0.22%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-158Improper Neutralization of Null Byte or NUL CharacterThe product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes NUL characters or null bytes when they are sent to a downstream component.
- CWE-290Authentication Bypass by SpoofingThis attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.
Affected systems
Debian1 product
- openvpnAll versions (No fix recorded) | < 2.7.8-1
Openvpn1 product
- openvpn≥ 2.7_alpha1, ≤ 2.7.7
Ubuntu1 product
- openvpnAll versions (No fix recorded)
3 vendors · 3 products
