How severe is CVE-2021-33630?

CVE-2021-33630 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-33630 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33630?

CVE-2021-33630 affects Openatom Openeuler. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-33630?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2021-33630 have an EU (EUVD) identifier?

Yes. CVE-2021-33630 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-20307.

When was CVE-2021-33630 published?

CVE-2021-33630 was published on 2024-01-18 and last updated on 2026-06-17.

CVE-2021-33630

CVE-2021-33630 is a medium-severity vulnerability in Openatom Openeuler with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2021-20307
Weakness: CWE-476
Affected product: Openatom Openeuler
Published: 2024-01-18
Last modified: 2026-06-17

Description

NULL Pointer Dereference vulnerability in openEuler kernel on Linux (network modules) allows Pointer Manipulation. This vulnerability is associated with program files net/sched/sch_cbs.C. This issue affects openEuler kernel: from 4.19.90 before 4.19.90-2401.3.

Frequently asked questions

What is CVE-2021-33630?: NULL Pointer Dereference vulnerability in openEuler kernel on Linux (network modules) allows Pointer Manipulation. This vulnerability is associated with program files net/sched/sch_cbs.C. This issue affects openEuler kernel: from 4.19.90 before 4.19.90-2401.3.
How severe is CVE-2021-33630?: CVE-2021-33630 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-33630 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-33630?: CVE-2021-33630 affects Openatom Openeuler. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-33630?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2021-33630 have an EU (EUVD) identifier?: Yes. CVE-2021-33630 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-20307.
When was CVE-2021-33630 published?: CVE-2021-33630 was published on 2024-01-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:openatom:openeuler:*:*:*:*:-:*:*:*

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