CVE-2022-33738: openvpn openvpn_access_server Insufficient Entropy
CVSS: 7.5v3.1HighModified
Published 06-07-2022Last modified 03-08-2024
Vulnerability summary
CVE-2022-33738 is a high (CVSS 7.5) Insufficient Entropy vulnerability in openvpn openvpn_access_server. EPSS estimates a 0.92% chance of exploitation in the next 30 days, higher than 59.5% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
0.92%
0%100%
Low · +0.03 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 06-07-2022PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
OpenVPN Access Server before 2.11 uses a weak random generator used to create user session token for the web portal
CVSS metrics
2 scores · 1 source · 2 versionsHigh 7.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NSourcesSingle source
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:N/A:NSourcesSingle source
EPSS trend
Probability
0.92%
Chance of exploitation in the next 30 days
Percentile
60%
Versus all other CVEs
30-day change
+0.03 pp
From 0.89% on 20-09-2026
20-09-202620-10-2026
EPSS score0.92%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-331Insufficient EntropyThe product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others.
- CWE-338Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)The product uses a Pseudo-Random Number Generator (PRNG) in a security context, but the PRNG's algorithm is not cryptographically strong.
Affected systems
Openvpn1 product
- openvpn_access_server< 2.11.0
1 vendor · 1 product