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Vulnerability record · CVE-2021-3905 · published 23 August 2022

CVE-2021-3905: Openvswitch memory leak vulnerability

Openvswitch · Openvswitch

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.

7.5 CVSS 3.1 High EPSS 2.0% · top 20.1% CWE-401 · Memory leak
7.5CVSS 3.1 base score
2.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
12References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/security/cve/CVE-2021-3905 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2019692 Issue TrackingPatchThird Party Advisory
https://github.com/openvswitch/ovs-issues/issues/226 ExploitIssue TrackingPatchThird Party Advisory
https://github.com/openvswitch/ovs/commit/803ed12e31b0377c37d7aa8c94b3b92f2081e349 PatchThird Party Advisory
https://security.gentoo.org/glsa/202311-16
https://ubuntu.com/security/CVE-2021-3905 PatchThird Party Advisory
https://access.redhat.com/security/cve/CVE-2021-3905 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2019692 Issue TrackingPatchThird Party Advisory
https://github.com/openvswitch/ovs-issues/issues/226 ExploitIssue TrackingPatchThird Party Advisory
https://github.com/openvswitch/ovs/commit/803ed12e31b0377c37d7aa8c94b3b92f2081e349 PatchThird Party Advisory
https://security.gentoo.org/glsa/202311-16
https://ubuntu.com/security/CVE-2021-3905 PatchThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-3905), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.