CVE-2021-3905

HIGHNVD 7.57.5—

7.5

A memory leak was found in Open vSwitch (OVS) during userspace IP fragmentation processing. An attacker could use this flaw to potentially exhaust available memory by keeping sending packet fragments.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 40.6%
KEV: Not listed

Published

August 23, 2022

Last Modified

November 21, 2024

References (12)

secalert@redhathttps://access.redhat.com/security/cve/CVE-2021-3905
secalert@redhathttps://bugzilla.redhat.com/show_bug.cgi?id=2019692
secalert@redhathttps://github.com/openvswitch/ovs-issues/issues/226
secalert@redhathttps://github.com/openvswitch/ovs/commit/803ed12e31b0377c37d7aa8c94b3b92f2081e349
secalert@redhathttps://security.gentoo.org/glsa/202311-16
secalert@redhathttps://ubuntu.com/security/CVE-2021-3905
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/security/cve/CVE-2021-3905
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=2019692
af854a3a-2127-422b-91ae-364da2661108https://github.com/openvswitch/ovs-issues/issues/226
af854a3a-2127-422b-91ae-364da2661108https://github.com/openvswitch/ovs/commit/803ed12e31b0377c37d7aa8c94b3b92f2081e349
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202311-16
af854a3a-2127-422b-91ae-364da2661108https://ubuntu.com/security/CVE-2021-3905

Patch Availability(4)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	openvswitch-test (2.16.0-0ubuntu2.1) @ impish	2026-05-25	ubuntu
redhat	openvswitch2.16-0:2.16.0-86.el8fdp	2022-08-01	redhat
redhat	openvswitch2.13-0:2.13.0-139.el8fdp	2022-01-10	redhat
redhat	openvswitch2.15-0:2.15.0-55.el8fdp	2022-01-10	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-401Missing Release of Memory after Effective Lifetime (Memory Leak)

All Vendor Advisories

(5)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 11× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-25 16:43 UTCEG score recompute
2026-05-25 16:43 UTCVendor advisory

Frequently asked(5)

What is CVE-2021-3905?

CVE-2021-3905 is a high vulnerability published on August 23, 2022. A memory leak was found in Open vSwitch (OVS) during userspace IP fragmentation processing. An attacker could use this flaw to potentially exhaust available memory by keeping sending packet fragments.

When was CVE-2021-3905 disclosed?

CVE-2021-3905 was first published in the National Vulnerability Database on August 23, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-3905 actively exploited?

CVE-2021-3905 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 40.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-3905?

CVE-2021-3905 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2021-3905?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-3905, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-3905

Published

Last Modified

References (12)

Patch Availability(4)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-3905?

Same vendor

Same CWE

CVE-2021-3905

📅 Published

🔄 Last Modified

🔗 References (12)

Patch Availability(4)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-3905?

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References (12)

Frequently asked(5)

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