CVE-2021-3773: fedoraproject fedora
CVSS: 9.8v3.1CriticalModified
AliasesUBUNTU-CVE-2021-3773
Published 16-02-2022Last modified 28-03-2025
Vulnerability summary
CVE-2021-3773 is a critical (CVSS 9.8) vulnerability in fedoraproject fedora. EPSS estimates a 5.28% chance of exploitation in the next 30 days, higher than 92.4% of scored vulnerabilities.
CVSS score
9.8/10
010
Critical · v3.1 (NVD)EPSS score
5.28%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 2Timeline
- 16-02-2022PublishedVulnerability first disclosed.
- 28-03-2025Last modifiedVulnerability information updated.
Description
A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network attacks.
CVSS metrics
3 scores · 2 sources · 2 versionsCritical 9.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 2 agree
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
High 7.5Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
5.28%
Chance of exploitation in the next 30 days
Percentile
92%
Versus all other CVEs
30-day change
0.00 pp
From 5.28% on 20-09-2026
20-09-202620-10-2026
EPSS score5.28%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu159 products
- linuxAll versions (No fix recorded)
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded)
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Oracle3 products
Fedoraproject1 product
- fedoraEOL34
Linux1 product
- linux_kernel< 5.14 | ≥ 5.15, < 5.15.15
Redhat1 product
- enterprise_linuxEOL6.0 | 7.0 | 8.0
5 vendors · 165 products
