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CVE-2021-33630

17
FAUCET Score

CVE-2021-33630 describes a NULL Pointer Dereference vulnerability within the network modules of the openEuler kernel, specifically affecting versions from 4.19.90 before 4.19.90-2401.3. This flaw, located in net/sched/sch_cbs.C, allows for pointer manipulation. It carries a CVSS score of 5.5 (Medium), indicating a local attack vector with low complexity that can lead to high availability impact. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
>= 4.19.90, < 4.19.90-2401.3CPE matchmatch criteria
cpe:2.3:o:openatom:openeuler:*:*:*:*:-:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.34%
Probability of exploitation in next 30 days
EPSS Percentile
26.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0034 is in the 83rd percentile among its peer group of 15,940 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: kernel-rt-0:4.18.0-193.rt13.51.el8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: kernel-0:4.18.0-193.el8
View patch

Vendor Advisories (1)

redhatCVE-2021-33630Moderate

kernel: net/sched: cbs NULL pointer dereference when offloading is enabled

Jan 18, 2024

References

gitee.com / src-openeuler/kernel/pulls/1389
Release Notes
git.kernel.org / pub/scm/linux/kernel/git/torvalds/linux.git/commit
lists.debian.org / debian-lts-announce/2024/06/msg00020.html
openeuler.org / zh/security/security-bulletins/detail
Vendor Advisory
openeuler.org / zh/security/security-bulletins/detail
Vendor Advisory
openwall.com / lists/oss-security/2024/01/30/10
openwall.com / lists/oss-security/2024/01/30/3
openwall.com / lists/oss-security/2024/01/30/4
openwall.com / lists/oss-security/2024/01/30/5
openwall.com / lists/oss-security/2024/01/30/9
openwall.com / lists/oss-security/2024/01/31/2
openwall.com / lists/oss-security/2024/01/31/3
openwall.com / lists/oss-security/2024/02/02/6
openwall.com / lists/oss-security/2024/02/02/9
openwall.com / lists/oss-security/2024/02/03/1