Vulnerability in Linux Kernel
CVE-2021-20322
A flaw in the processing of received ICMP errors (ICMP fragment needed and ICMP redirect) in the Linux kernel functionality was found to allow the ability to quickly scan open UDP ports. This flaw allows an off-path remote user to effectively bypass the source port UDP randomization. The highest threat from this vulnerability is to confidentiality and possibly integrity, because software that relies on UDP source port randomization are indirectly affected as well.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.069 (94.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 94.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.069 · newest: 0.069 · change: 0.000
Affected products
- Linux Kernel
- NetApp Active Iq Unified Manager
- NetApp Aff A700s
- NetApp Aff A700s Firmware
- NetApp Aff Baseboard Management Controller — versions a400
- NetApp Aff Baseboard Management Controller Firmware
- NetApp E-Series Santricity OS Controller
- NetApp Fas Baseboard Management Controller — versions 8300, 8700
- NetApp Fas Baseboard Management Controller Firmware
- NetApp H300e
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Mailing List, Vendor Advisory)
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Mailing List, Vendor Advisory)
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/ipv4/rout… (Patch, Mailing List, Vendor Advisory)
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/ipv6/rout… (Patch, Mailing List, Vendor Advisory)
- lists.debian.org/debian-lts-announce/2022/03/msg00012.html (mailing-list, Mailing List, Third Party Advisory)
- www.debian.org/security/2022/dsa-5096 (vendor-advisory, Third Party Advisory)
- www.oracle.com/security-alerts/cpujul2022.html (Third Party Advisory)
- security.netapp.com/advisory/ntap-20220303-0002/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-20322?
- CVE-2021-20322 is a high-severity vulnerability in Linux Kernel, classified under Use of Insufficiently Random Values. CVSS score: 7.4/10. Published 2022-02-18.
- How severe is CVE-2021-20322?
- High severity. CVSS v3 base score is 7.4 out of 10.
- Is CVE-2021-20322 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.