Information disclosure in Linux Kernel
CVE-2021-3773
A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network attacks.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.053 (92.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 92.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.053 · newest: 0.053 · change: 0.000
Affected products
- Linux Kernel
- Oracle Communications Cloud Native Core Binding Support Function — versions 22.1.3
- Oracle Communications Cloud Native Core Network Exposure Function — versions 22.1.1
- Oracle Communications Cloud Native Core Policy — versions 22.2.0
- Fedoraproject Fedora — versions 34
- Red Hat Enterprise Linux — versions 6.0, 7.0, 8.0
- Kernel — versions kernel 5.14.0-49.el9, kernel 5.15.15-100.fc34, kernel 5.15.15-200.fc35
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- www.oracle.com/security-alerts/cpujul2022.html (Patch, Third Party Advisory)
- citizenlab.ca/2024/07/vulnerabilities-in-vpns-paper-presented-at-the-privacy-en…
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2021-3773?
- CVE-2021-3773 is a critical-severity vulnerability in Linux Kernel, classified under Information Disclosure. CVSS score: 9.8/10. Published 2022-02-16.
- How severe is CVE-2021-3773?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-3773 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.