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CVE-2020-8953

27
FAUCET Score

CVE-2020-8953 describes a critical authentication bypass vulnerability in OpenVPN Access Server versions 2.8.x prior to 2.8.1, specifically impacting LDAP authentication unless two-factor authentication is enabled for the user. With a CVSS score of 9.8 (CRITICAL), this flaw allows an unauthenticated attacker to remotely bypass authentication with low complexity, leading to full compromise of confidentiality, integrity, and availability. Despite its severity, there is currently no public exploit code available, nor is there evidence of active exploitation or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.8.0, < 2.8.1CPE matchmatch criteria
cpe:2.3:a:openvpn:openvpn_access_server:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.34%
Probability of exploitation in next 30 days
EPSS Percentile
68.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0134 is in the 55th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

oroincpatch availablevia llm_extracted

Vendor Advisories (1)

oroincllm-oroinc-086a9722acc4716bHIGH

LDAP Authentication Bypass in OpenVPN Access Server 2.8.0

Feb 12, 2020

References

openvpn.net / security-advisories
Vendor Advisory