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Vulnerability · Published Apr 27, 2020 · Assigned by mitre

CVE-2020-11810

Low 3.7

In plain English

A low-severity security flaw in the openvpn package (Alpine). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.7% (higher than 77% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)3.7Low
Exploit odds (30 days)1.7%top 23.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

An issue was discovered in OpenVPN 2.4.x before 2.4.9. An attacker can inject a data channel v2 (P_DATA_V2) packet using a victim's peer-id. Normally such packets are dropped, but if this packet arrives before the data channel crypto parameters have been initialized, the victim's connection will be dropped. This requires careful timing due to the small time window (usually within a few seconds) between the victim client connection starting and the server PUSH_REPLY response back to the client. This attack will only work if Negotiable Cipher Parameters (NCP) is in use.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20openvpn2.4.9-r0ALPINE-CVE-2020-11810
Alpine:v3.21openvpn2.4.9-r0ALPINE-CVE-2020-11810
Alpine:v3.22openvpn2.4.9-r0ALPINE-CVE-2020-11810
Alpine:v3.23openvpn2.4.9-r0ALPINE-CVE-2020-11810
Alpine:v3.24openvpn2.4.9-r0ALPINE-CVE-2020-11810
Debian:12openvpn2.4.9-1DEBIAN-CVE-2020-11810
Debian:13openvpn2.4.9-1DEBIAN-CVE-2020-11810
Debian:14openvpn2.4.9-1DEBIAN-CVE-2020-11810

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References