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CVE-2021-20322

HIGH
7.4
CVSS Score
Published: February 18, 2022 at 05:50 PM UTC
Updated: July 30, 2026 at 07:59 PM UTC
33 products affected across 6 vendorsLinux KernelDebian LinuxFedora

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Severity
HIGH7.4
Exploit prediction
EPSS 7%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux· Debiandrupal
95%
10.09.0
Fedora· Fedora Projectrpm
95%
34
Linux Kernel· Linux
95%
4.15 ≤ v < 4.19.2154.20 ≤ v < 5.4.1575.11 ≤ v < 5.13.145.5 ≤ v < 5.10.62
Affected range stops below 4.19.215, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.10.62, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.13.14, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.4.157, so it looks safe — our inference, not a vendor statement
Active IQ Unified Manager· NetAppnpm
95%
All versions
Aff A700S Firmware· NetApp
95%
All versions
netapp-aff-a700s (same device)
Aff Baseboard Management Controller Firmware· NetApp
95%
All versions
netapp-aff-baseboard-management-controller (same device)
E Series Santricity OS Controller· NetApp
95%
11.0 ≤ v ≤ 11.70.1
Fas Baseboard Management Controller Firmware· NetApp
95%
All versions
netapp-fas-baseboard-management-controller (same device)
H300E Firmware· NetAppdrupal
95%
All versions
netapp-h300e (same device)
H300S Firmware· NetAppdrupal
95%
All versions
netapp-h300s (same device)

References (9)

x_refsource_MISCIssue TrackingThird Party Advisory
Source: [email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=2014230
x_refsource_MISCMailing ListPatchVendor Advisory
Source: [email protected]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v5.15-rc6&id=4785305c05b25a242e5314cc821f54ade4c18810
x_refsource_MISCMailing ListPatchVendor Advisory
Source: [email protected]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v5.15-rc6&id=6457378fe796815c973f631a1904e147d6ee33b1
x_refsource_MISCMailing ListPatchVendor Advisory
Source: [email protected]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/ipv4/route.c?h=v5.15-rc6&id=67d6d681e15b578c1725bad8ad079e05d1c48a8e
x_refsource_MISCMailing ListPatchVendor Advisory
Source: [email protected]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/ipv6/route.c?h=v5.15-rc6&id=a00df2caffed3883c341d5685f830434312e4a43
Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://security.netapp.com/advisory/ntap-20220303-0002/
Vendor Advisoryx_refsource_DEBIANThird Party Advisory
Source: [email protected]
https://www.debian.org/security/2022/dsa-5096

CVSS

7.4HIGH[email protected]
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-330

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